GRB 190106A
GCN Circular 23615
Subject
GRB 190106A: Swift detection of a burst with an optical counterpart
Date
2019-01-06T13:45:24Z (6 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@milkyway.gsfc.nasa.gov>
E. Sonbas (Adiyaman Univ.), S. D. Barthelmy (GSFC),
A. P. Beardmore (U Leicester), D. N. Burrows (PSU), C. Gronwall (PSU),
N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC) and
K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift
Observatory Team:
At 13:34:44 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 190106A (trigger=882252). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 29.886, +23.857, which is
RA(J2000) = 01h 59m 33s
Dec(J2000) = +23d 51' 24"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows multiple peaks
with a duration of about 100 sec. The peak count rate
was ~4000 counts/sec (15-350 keV), at ~10 sec after the trigger.
The XRT began observing the field at 13:36:06.3 UT, 81.8 seconds after
the BAT trigger. Using promptly downlinked data we find a bright,
uncatalogued X-ray source located at RA, Dec 29.87964, 23.84516 which
is equivalent to:
RA(J2000) = 01h 59m 31.11s
Dec(J2000) = +23d 50' 42.6"
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This
location is 47 arcseconds from the BAT onboard position, within the BAT
error circle. This position may be improved as more data are received;
the latest position is available at http://www.swift.ac.uk/sper. We
cannot determine whether the source is fading at the present time. No
spectrum from the promptly downlinked event data is yet available to
determine the column density.
The initial flux in the 0.1 s image was 1.98e-08 erg cm^-2 s^-1 (0.2-10
keV).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 90 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 01:59:31.18 = 29.87993
DEC(J2000) = +23:50:44.0 = 23.84555
with a 90%-confidence error radius of about 0.61 arc sec. This position is 5.0
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.45 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.09.
Burst Advocate for this burst is E. Sonbas (edasonbas AT yahoo.com).
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular 23616
Subject
GRB 190106A: MASTER Amur OT detection
Date
2019-01-06T14:20:15Z (6 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, A.Kuznetsov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov,
N.Tyurina, P.Balanutsa,D. Vlasenko
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University
V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev
Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk
Irkutsk State University
R. Podesta, Carlos Lopez and F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA)
Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias
D. Buckley, S. Potter, A. Kniazev, M. Kotze
South African Astronomical Observatory
MASTER-Amur robotic telescope (Global MASTER-Net:
http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy,
vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical
University) was pointed to the GRB190106.57 (Swift BAT alert, GCN 23615)
20 sec after notice time and
36 sec after trigger time at 2019-01-06 13:35:20 UT. On our first (10s
exposure) set we found optical transient within SWIFT BAT error-box
(ra=29.8792 dec=23.8567 r=0.05).
The 5-sigma upper limit has been about 16.5mag
RA, DEC = 01h 59m 31.20s +23d 50m 44.04s
mag = 16.0
The automatical photometry are:
start time coord2000 Band mag emag exp
13:35:20.0 1h 59m 31.17s +23d 50m 44.5s P 16.2 0.20 10
13:35:46.6 1h 59m 31.19s +23d 50m 44.8s P 15.2 0.14 10
13:36:12.6 1h 59m 31.23s +23d 50m 44.1s P 15.8 0.15 20
13:36:47.8 1h 59m 31.19s +23d 50m 44.6s P 16.2 0.17 20
13:37:24.9 1h 59m 31.23s +23d 50m 44.5s P 15.8 0.11 30
13:38:08.7 1h 59m 31.18s +23d 50m 44.2s P 15.4 0.08 40
13:39:03.1 1h 59m 31.17s +23d 50m 44.2s P 15.7 0.07 50
13:40:07.0 1h 59m 31.18s +23d 50m 44.1s P 15.5 0.09 60
13:41:35.5 1h 59m 31.20s +23d 50m 44.0s P 15.6 0.10 60
13:43:03.7 1h 59m 31.18s +23d 50m 44.3s P 15.9 0.11 60
13:44:28.9 1h 59m 31.18s +23d 50m 43.8s P 16.1 0.12 60
...............................
to be continuated...
This optical counterpart is coincident with Swift optical object (Sonbas
et al., GCN 23615).
The galactic latitude b = -36 deg., longitude l = 143 deg.
The observations made on zenit distance = 45 deg.The moon ( 0 % bright
part) below the horizon (The altitude of the Moon is -50 deg. ).
The sun altitude is -53.7 deg.
The object can be observed till 2019-01-07 18:34:53
This message may be cited, but this is the first automatic photometry.
Non monotonic light curve was detected.
GCN Circular 23617
Subject
GRB 190106A: MITSuME Akeno optical observation
Date
2019-01-06T14:36:58Z (6 years ago)
From
Ryosuke Itoh at Tokyo Institute of Tech. <itoh@hp.phys.titech.ac.jp>
R. Itoh, K. L. Murata, Y. Tachibana, S. Harita, K. Morita,
K. Shiraishi, K. Iida, M. Niwano, R. Adachi, M. Oeda, Y. Yatsu,
and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration
We searched for the optical counterpart of GRB 190106A (Sonbas et al., GCN
Circular #23615) with the optical three color (g', Rc, and Ic) CCD cameras
attached to the MITSuME 50cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 13:35:33 UT which corresponds to
49 sec after the trigger.
We detected the point source at the position consistent with the Swift/UVOT
observation (Sonbas et al., GCN Circular #23615) and MASTER
observation (Lipunov et al., GCN Circular #23616).
The measured magnitudes are listed as follows.
T0+[sec] MID-UT T-EXP[sec] g' Rc Ic
-------------------------------------------------------------------------------------------------------
~49 13:36:02.6 60 ~16.1 ~15.6 ~15.5
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used UCAC-4 catalog for flux calibration.
The magnitudes are expressed in the AB system.
Further analysis is ongoing.
GCN Circular 23618
Subject
GRB 190106A: GMG detection
Date
2019-01-06T14:40:05Z (6 years ago)
From
Jirong Mao at Yunnan Obs <jirongmao_obs@ynao.ac.cn>
J. Mao, Y.-X. Xin, Y. Li, and J.-M. Bai (YNAO) report:
We observed the field of GRB 190106A (Sonbas et al., GCN 23615) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories. Observations began about 0.5 hours after the trigger. We clearlydetected the optical source reported by Yurkov et al. (GCN 23614). The spectral observation is ongoing.
GCN Circular 23619
Subject
GRB 190106A: Enhanced Swift-XRT position
Date
2019-01-06T15:22:20Z (6 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)
report on behalf of the Swift-XRT team.
Using 621 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 190106A, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 29.88004, +23.84544 which is equivalent
to:
RA (J2000): 01h 59m 31.21s
Dec (J2000): +23d 50' 43.6"
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the
Swift-XRT team.
GCN Circular 23620
Subject
GRB 190106A : TSHAO optical observations
Date
2019-01-06T15:27:05Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
I. Reva (FAPHI), A. Pozanenko (IKI),
A. Kusakin (FAPHI), S. Belkin (IKI), A. Volnova (IKI), E. Mazaeva
(IKI), M. Krugov (FAPHI) report on behalf of larger GRB follow-up
collaboration:
We observed the optical transient (Yurkov et al., GCN 23614; Sonbas et
al., GCN 23615; Lipunov et al., GCN 23616; Itoh et al., GCN 23617) of
GRB 190106A (Sonbas et al., GCN 23615) with Zeiss-1000 1-m telescope of
Tien Shan Astronomical Observatory starting on Jan. 6 (UT) 13:45:42.
Preliminary photometry of the object in the beginnig of observations is
R= 16.23 +/- 0.05, and the optical transient is faded as R= 17/5 +/- 0.1
at (UT) 14:24:04. (The photometry is based on nearby USNO-B1.0 stars).
Observations are continuing in R and B - filters.
GCN Circular 23622
Subject
GRB 190106A: GWAC-F60B optical detection
Date
2019-01-06T15:40:35Z (6 years ago)
From
L.P. Xin at NAOC <xlp@nao.cas.cn>
L. P. Xin, P. P. Zhang, R. S. Zhang, J. Wang, J. Y. Wei, E. W. Liang,
X. G. Wang, Y. J. Xiao, Y. G. Yang, X. M. Lu, L. Huang, H. B. Cai,
Y. L. Qiu, Y. Xu, Y. J. Xiao, Y. T. Zheng, C. Wu, J. S. Deng, D. W. Xu,
D. TURPIN, H. L. Li, and W. L. Dong, report:
We observed GRB 190106A ( Sonbas et al., GCN 23615 )
with GWAC-F60B 60cm optical telescope at 14:51:03 UT,
Jan. 06th 2019, about 77 min after the burst.
The optical afterglow reported by ( Sonboas et al., GCN 23615;
Lipunov et al., GCN 23636; Itoh et al., GCN23617; Mao et al., GCN 23618 )
is clearly detected in R band images. The brightness is 17.8mag
calibrated by nearby USNO-B1.0 stars.
GWAC-F60B is operated by Guangxi university and NAOC, CAS,
at Xinglong observatory, China.
Further observation is continuing.
The message may be cited.
GCN Circular 23623
Subject
GRB 190106A: Xinglong-2.16m spectroscopy
Date
2019-01-06T17:23:09Z (6 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Z.P. Zhu, D. Xu, Y. Wang, J.B. Zhang (NAOC), J.H. Liu, X. Zhang (XAO)
report:
We observed the optical afterglow of GRB 190106A (Sonbas et al., GCN
23615) using the Xinglong-2.16m telescope equipped with BFOSC. We
acquired 1x3600 s and then 1x2400 s spectra starting at 14:02:39 UT on
2019-01-06, i.e., 27.9 mins after the burst. The optical afterglow was
R~16 mag at this time.
From preliminary analysis, a continuum is detected across the spectral
range of 3600 - 9000 AA. A few absorption features are also detected due
to Fe II, Al II, Mn II, Mg II doublet, and Mg I, at a redshift of
z~0.896, which we propose as the likely redshift of the GRB.
GCN Circular 23624
Subject
GRB 190106A: Bassano Bresciano Observatory optical detection
Date
2019-01-06T20:57:28Z (6 years ago)
From
Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>
U.Quadri, L.Strabla and A.Quadri report:
We imaged the field of GRB 190106A detected by SWIFT(trigger 882252)
with the robotic telescope of (IAU station 565) Bassano Bresciano
Observatory, Italy. Member of:
AAVSO - American Association of Variable Star Observers.
ISSP - Italian Supernovae Search Project.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.
The observations started 6.16 hour after the GRB trigger,
with our baker-Schmidt telescope D=250 mm F/D=3.
Weather conditions were good.
We co-added 2 series of 15 exposures of 60 sec each.
Start T0+ End T0+ Vlim
6.16 hour 6.72 hour 19.5
We detect the afterglow in the error box of the XRTcandidate.
E. Sonbas (Adiyaman Univ.), S. D. Barthelmy (GSFC), et al.
at the following position (+/- 2 arcsec):
RA (J2000.0) = 01h 59m 31.50s
DEC(J2000.0) = +23�� 50' 44.7"
The results of our photometry are:
------------------------------------
JD V mag Cat
------------------------------------
2458490.33004 19.130 V UCAC4
2458490.34077 19.344 V UCAC4
------------------------------------
Magnitudes were estimated with the UCAC4 cat. and
are not corrected for galactic dust extinction.
The images are available at:
http://www.osservatoriobassano.org/GRB.asp
The message may be cited.
GCN Circular 23625
Subject
GRB 190106A: Swift-BAT refined analysis
Date
2019-01-06T21:07:30Z (6 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@milkyway.gsfc.nasa.gov>
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI),
H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),
T. Sakamoto (AGU), E. Sonbas (Adiyaman Univ.), M. Stamatikos (OSU),
T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+695 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 190106A (trigger #882252)
(Sonbas, et al., GCN Circ. 23615). The BAT ground-calculated position is
RA, Dec = 29.877, 23.839 deg, which is
RA(J2000) = 01h 59m 30.6s
Dec(J2000) = +23d 50' 20.8"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 65%.
The mask-weighted light curve shows it started at ~T-10sec, with a pair of
overlapping FRED-like peaks at ~T+2 and ~T+10 sec, then a long decay and
two more peaks at ~T+57 and ~T+76 sec, and returning to baseline
at ~T+125 sec. T90 (15-350 keV) is 76.8 +- 2.4 sec (estimated error
including systematics).
The time-averaged spectrum from T-0.17 to T+99.72 sec is best fit by a power law
with an exponential cutoff. This fit gives a photon index 1.34 +- 0.21,
and Epeak of 120 +- 83 keV (chi squared 37.25 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 6.0 +- 0.2 x 10^-6 erg/cm2
and the 1-sec peak flux measured from T+75.28 sec in the 15-150 keV band is
5.5 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index
of 1.64 +- 0.05 (chi squared 43.44 for 57 d.o.f.). All the quoted errors
are at the 90% confidence level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/882252/BA/
GCN Circular 23626
Subject
GRB 190106A: Swift/UVOT Detection
Date
2019-01-06T21:43:23Z (6 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and E. Sonbas (Adiyaman Univ.)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190106A
90 s after the BAT trigger (Sonbas et al., GCN Circ. 23615).
A source consistent with the XRT position (Goad et al. GCN Circ. 23619)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 01:59:31.16 = 29.87985 (deg.)
Dec (J2000) = +23:50:43.9 = 23.84552 (deg.)
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
The source was also detected by MASTER (Yurkov et al, GCN Circ.
23614,23616),
MITSuME (Itoh et al, GCN Circ. 23617), GMG (Mao et al, GCN Circ. 23618),
TSHAO (Reva et al, GCN Circ. 23620), GWAC-F60B (Xin et al, GCN Circ. 23622),
Xinglong (Zhu et al, GCN Circ. 23623) who report a redshift of z~0.896 and
Bassano Bresciano Observatory (Quadri et al, GCN Circ. 23624).
Preliminary detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures
are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 90 240 147 16.64 +/- 0.03
v 633 653 20 16.54 +/- 0.16
b 559 579 20 16.70 +/- 0.09
u 304 553 246 15.97 +/- 0.03
w1 682 702 20 17.36 +/- 0.29
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.09 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 23627
Subject
GRB 190106A: BOOTES-4/MET optical observations
Date
2019-01-06T22:39:38Z (6 years ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>
Y.-D. Hu, X.-Y.Li, E. Fernandez-Garcia, A. Ayala, A. J. Castro-Tirado
(IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de
Malaga), S. Guziy (Nikolaev Astronomical Observatory) and D. Xiong, Y.
Fan, X. Zhao, J. Bai, C. Wang, Y. Xin (Yunnan Nacional Astronomical
Observatory) on behalf of a larger collaboration, report:
Following the detection of GRB 190106A by Swift (Sonbas et al. GCNC
23615), the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical
Observatory (China) triggered alert at 15:12:56 UT (~1.6 hr after
trigger). The reported optical afterglow (Yurkov et al. GCNC 23614,
Lipunov et al. GCNC 23616, Itoh et al. GCNC 23617, Mao et al. GCNC
23618, Reva et al. GCNC 23620 and Xin et al. 23622) is still clearly
detected within the refined XRT position (Goad et al. GCNC 23619). A
preliminary photometry yields a magnitude of 19.4 +/- 0.1 (g-band).
Observations are ongoing.
GCN Circular 23628
Subject
GRB 190106A: OASDG optical observations
Date
2019-01-06T23:33:26Z (6 years ago)
From
Luca Izzo at IAA-CSIC <luca.izzo@gmail.com>
A. Noschese (AC-OASDG), L. Izzo (IAA-CSIC), A. Di Dato and L. D���Avino (AC-OASDG) report:
We observed the field of GRB 190106A (Sonbas et al. GCN 23615) with the 0.5m telescope of the Osservatorio Astronomico S. Di Giacomo located in Agerola, Italy ( https://goo.gl/Dqvqhf ).
We obtained a series of 3x180 s images in the Rc filter, starting at 21:44:38 UT, ~ 8.17 hrs after the GRB detection. In our stacked image, we find a source at the position of the observed optical counterpart (Lipunov et al. GCN 23616, Itoh et al. GCN 23617, Mao et al. GCN 23618, Reva et al., GCN 23620, Xin et al. GCN 23622, Quadri et al. GCN 23624, Hu et al. GCN 23627) for which we measure a magnitude of Rc(AB) = 19.47 +/- 0.10 mag. The calibration was performed using nearby stars in the USNO B1 catalog.
GCN Circular 23629
Subject
GRB 190106A: update of the Xinglong-2.16m spectroscopy
Date
2019-01-07T05:25:15Z (6 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
D. Xu, Z.P. Zhu, Y. Wang, J.B. Zhang (NAOC), J.H. Liu, X. Zhang (XAO)
report:
We have re-reduced the 3600s+3000s spectra taken from the Xinglong-2.16m
telescope (Zhu et al., GCN 23623), with the calibration frames taken in
the same night. The Signal-to-Noise of the spectrum increased compared
with the previous 3600s one, and the resolution is not high due to
seeing~2.0".
We only consider relatively prominent absorption features and thus only
six features are left, which can be interpreted as C IV 1547.62, 1550.19,
Fe II 2585.88, 2599.40, and Mg II doublet 2795.53, 2802.71
(wavelength in air), at an updated and consistent redshift of z=1.86.
[GCN OPS NOTE(08jan19): Per author's request, In the SUBJECT-line,
the "180106A" was changed to "190106A". And the
"Fe II 1547.62, 1550.19, 2585.88, 2599.40, and Mg II doublet 2795.53, 2802.71" was changed to
"C IV 1547.62, 1550.19, Fe II 2585.88, 2599.40, and Mg II doublet 2795.53, 2802.71".]
GCN Circular 23630
Subject
GRB 190106A: GMG spectral results
Date
2019-01-07T10:41:54Z (6 years ago)
From
Jirong Mao at Yunnan Obs <jirongmao_obs@ynao.ac.cn>
J. Mao, Y.-X. Xin, Y. Li, J.-M. Bai (YNAO), J. Wang, and L. P. Xin (NAOC) report:
We observed the afterglow of GRB 190106A with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories. The spectral observations began about 0.5 hours after the trigger. The spectrum has excellent S/N. Some absorption lines, such as SiIV 1394, SiII 1527, AlII 1671, AlIII 1855/1863, CrII+ZnII 2062, and FeII 2344/2383, were clearly detected. This indicates a redshift of about 1.86, consistent with the result of Xu et al. (GCN. 23629). Moreover, we note a possible broad emission feature around 4500A, and further analysis is ongoing.
GCN Circular 23632
Subject
GRB 190106A: VLT/X-shooter redshift confirmation
Date
2019-01-07T13:01:48Z (6 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@dark-cosmology.dk>
P. Schady (Univ. of Bath), D. Xu (NAOC), K. E. Heintz (Univ. of Iceland), N. R. Tanvir (Univ. Leicester), D. B. Malesani (DAWN/NBI and DARK/NBI), D. A. Kann (HETH/IAA-CSIC), R. Sanchez-Ramirez (INAF/IAPS) and K. Wiersema (Univ. of Warwick) report:
We observed the optical counterpart of GRB 190106A (Sonbas et al., GCN #23615; Yurkov et al., GCN #23614) with the ESO-VLT UT2 (Kueyen) equipped with the X-shooter spectrograph, covering the wavelength range 3000-21000 AA. We acquired four 600 second spectra on 2019-01-07 between 00:53UT and 01:47UT, approximately 11 hours after the GRB. In the acquisition image we measure r = 19.47 +/- 0.02 (AB), calibrated against a nearby Pan-STARRS object.
We detect several absorption features at a common redshift z = 1.859, consistent with the value reported by Xu et al. (GCN #23629) and Mao et al. (GCN #23630). In addition to the absorption lines reported by Xu et al. and Mao et al., we also detect O I, C II, Mg I, and C IV, all at the same redshift, as well a broad feature due to H I Lyalpha absorption.
We acknowledge Steffen Mieske and Joe Anderson at Paranal for their excellent help in obtaining these observations.
GCN Circular 23633
Subject
GRB 190106A: Swift-XRT refined Analysis
Date
2019-01-07T13:45:03Z (6 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U.
Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri
(INAF-OAB), D.N. Burrows (PSU), A. Tohuvavohu (PSU), S. J. LaPorte
(PSU) and V. Yurkov report on behalf of the Swift-XRT team: report on
behalf of the Swift-XRT team:
We have analysed 5.7 ks of XRT data for GRB 190106A (Yurkov et al. GCN
Circ. 23614), from 85 s to 44.7 ks after the BAT trigger. The data
comprise 254 s in Windowed Timing (WT) mode with the remainder in
Photon Counting (PC) mode. The enhanced XRT position for this burst was
given by Goad et al. (GCN Circ. 23619).
The late-time light curve (from T0+11.7 ks) can be modelled with a
power-law decay with a decay index of alpha=1.02 (+/-0.11).
A spectrum formed from the WT mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.06 (+0.06, -0.05). The
best-fitting absorption column is 1.9 (+/-1.1) x 10^21 cm^-2, at a
redshift of 1.86, in addition to the Galactic value of 1.0 x 10^21
cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index
of 1.95 (+0.09, -0.06) and a best-fitting absorption column consistent
with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV
flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (4.4
x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Galactic foreground: 1.0 x 10^21 cm^-2
Intrinsic column: 1.0 (+1.6, -0.0) x 10^21 cm^-2 at z=1.86
Photon index: 1.95 (+0.09, -0.06)
If the light curve continues to decay with a power-law decay index of
1.02, the count rate at T+24 hours will be 0.096 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.4 x
10^-12 (4.2 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00882252.
This circular is an official product of the Swift-XRT team.
GCN Circular 23634
Subject
GRB 190106A: GMG photometry in the 2nd night
Date
2019-01-07T14:15:26Z (6 years ago)
From
Jirong Mao at Yunnan Obs <jirongmao_obs@ynao.ac.cn>
J. Mao, Y.-X. Xin, Y. Li, J.-M. Bai (YNAO) report:
We observed the afterglow of GRB 190106A with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories in the second night. The observation began at UT 12:47:01, 7th, Jan, 2019, about 23.2 hours after the trigger. We still clearly detected the source. A preliminary measurement provided a magnitude of R~19.7. We suggest other telescopes to keep on observations.
GCN Circular 23635
Subject
IERCOO/ICSP optical observation of GRB 190106A
Date
2019-01-07T16:12:16Z (6 years ago)
From
Sandip K. Chakrabarti at ICSP <sandipchakrabarti9@gmail.com>
IERCOO/ICSP optical observation of GRB 190106A
Sandip K. Chakrabarti, Argha Sil, Shyam Sarkar, Ashim Sarkar, D.
Bhowmick (Indian
Centre for Space Physics)
We observed GRB 190106A using 0.61m reflector of our observatory at
Sitapur, West Bengal, India. The observation was with R, V, and B filters
in a short interval at around 16:45UT on 6th January, 2019, i.e., about
three hours after the BAT trigger (Sonbas et al. 2019; GCN 23615). Using
two exposures each of 90s in R and in V, we obtained the magnitudes of
17.83+/-0.25 and 18.45 +/- 0.23 respectively. Using one 90s exposure in B,
we obtained the magnitude of 18.81+/-0.39. Using triangulation, we obtained
the location of the afterglow to be RA(J2000) = 01h 59m 31.17s, Dec(J2000)
= +23d 50m 43.94s with two pixel error 0.46s. Three sigma method was used
to estimate the magnitudes with a calibrator J01593557 +2348527 which is of
V mag ~12.5. After 24 hours of the BAT trigger we do not detect the
afterglow on 7th Jan. at 13:30UT. The details of images and other results
will be in http:/csp.res.in.
GCN Circular 23636
Subject
GRB 190106A: NEXT-0.6m and Xinglong-2.16m photometric single powerlaw decay
Date
2019-01-07T16:48:35Z (6 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Z.P. Zhu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.H.
Liu (XAO) report:
We monitored the optical afterglow of GRB 190106A (e.g., Sonbas et al.,
GCN 23615) using the NEXT-0.6m telescope located at Nanshan, Xinjiang,
China and the Xinglong-2.16m telescope.
The observations of NEXT-0.6m started at 13:57:21 UT on 2019-01-06
(i.e., 0.38 hr post-burst) and ended at 19:48:25 UT on 2019-01-06 (i.e.,
5.97 post-burst), with a series of 60s, 90s, 120s, 200s, and 300s
exposures in the R-band. The afterglow had R=16.9+/-0.1 mag at the
beginning, and rather smoothly decayed to R=19.1+/-0.1 mag at the end,
calibrated with nearby SDSS stars.
The Xinglong-2.16m observations were carried out at 12:54:46 UT on
2019-01-07, i.e, 23.33 hr post-burst, with 5x360s in the R-band. The
afterglow has decayed to R=19.9+/-0.1 mag, calibrated with the same
reference stars.
The joint NEXT-0.6m and Xinglong-2.16m dataset shows that so far the
afterglow R-band lightcurve has been decaying, and following a single
powerlaw of F ~ t^-alpha, where alpha~0.64.
GCN Circular 23637
Subject
Konus-Wind observation of GRB 190106A
Date
2019-01-07T20:22:03Z (6 years ago)
From
Anastasia Tsvetkova at Ioffe Institute <tsvetkova@mail.ioffe.ru>
A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks,
M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline
on behalf of the Konus-Wind team, report:
The�� GRB 190106A (Swift detection: Sonbas et al., GCN 23615;
Palmer et al., GCN 23625)
triggered Konus-Wind at T0=48887.602 s UT (13:34:47.602).
The burst light curve shows a multi-peaked structure
which starts at ~T0-5 s and has a total duration of ~79 s.
The emission is seen up to ~2 MeV.
As observed by Konus-Wind, the burst
had a fluence of 1.12(-0.17,+0.25)x10^-5 erg/cm2,
and a 64-ms peak energy flux, measured from T0-0.044 s,
of 1.81(-0.89,+1.19)x10^-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst
(measured from T0 to T0+82.176 s)
is best fit in the 20 keV - 16 MeV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with�� alpha = -1.00(-0.50,+0.63),
and Ep = 171(-42,+90) keV (chi2 = 81/98 dof).
Fitting by the GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index:
beta < -2.31 (chi2 = 81/97 dof).
The spectrum near the peak count rate
(measured from T0 to T0+8.448 s)
is best fit in the 20 keV - 1.2 MeV range
by the power law with exponential cutoff model:
with�� alpha = -1.15(-0.50,+0.66),
and Ep = 216(-66,+308) keV (chi2 = 55/60 dof).
Fitting by the GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index:
beta < -1.85 (chi2 = 55/59 dof).
Assuming the redshift z=1.859 (Xu et al., GCN 23629;
Mao et al., GCN 23630; Schady et al., GCN 23632)
and a standard cosmology model with H_0 = 67.3 km/s/Mpc,
Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014),
we estimate the following rest-frame parameters:
the isotropic energy release E_iso is 9.96(-1.55,+2.25)x10^52 erg,
the peak luminosity L_iso is 4.62(-2.28,+3.03)x10^52 erg/s,
and the rest-frame peak energy of the time-integrated spectrum,
Ep,i, is 489(-120,+257) keV, and the rest-frame peak energy of
the 'peak' spectrum, Ep,p,z, is 618(-189, 881) keV.
With these energetics, the burst lies within the 68% prediction bands
for both 'Amati' and 'Yonetoku' relations built for the sample
of 138 long KW GRBs with known redshifts
(Tsvetkova et al., ApJ 850 161, 2017).
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB190106_T48887/
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
GCN Circular 23638
Subject
GRB 190106A : continued TSHAO optical observations
Date
2019-01-07T23:21:36Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
I. Reva (FAPHI), A. Pozanenko (IKI), S. Belkin (IKI), A. Volnova (IKI),
E. Mazaeva (IKI), E. Klunko (ISTP), A. Kusakin (FAPHI), M. Krugov (FAPHI)
report on behalf of IKI FuN collaboration:
We continue the observations of the optical afterglow (e.g. Lipunov et al.
GCN 23616, Itoh et al. GCN 23617, Mao et al. GCN 23618, Reva et al., GCN
23620, Xin et al. GCN 23622, Quadri et al. GCN 23624, Hu et al. GCN 23627)
of the GRB 190106A (Sonbas et al., GCN 23615) with Zeiss-1000 telescope of
Tien Shan Astronomical Observatory.
We obtained several images in R-filter starting on Jan. 7 (UT) 12:57:20.
Preliminary photometry of the afterglow is R= 20.07 +/- 0.06 at (UT, mid
time) 13:40:10 which is compatible with the photometry reported in GCN
23636 (Zhu et al.) The photometry is based on nearby USNO-B1.0 stars.
GCN Circular 23640
Subject
GRB 190106A: Mondy optical observations
Date
2019-01-08T11:50:31Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), E. Klunko (ISTP), A. Pozanenko (IKI), E. Mazaeva (IKI), A.
Volnova (IKI), I. Reva (FAPI) report on behalf of IKI-FuN:
We observed the optical afterglow (e.g. Lipunov et al. GCN 23616, Itoh et
al. GCN 23617, Mao et al. GCN 23618, Reva et al., GCN 23620, Xin et al. GCN
23622, Quadri et al. GCN 23624, Hu et al. GCN 23627) of the GRB 190106A
(Sonbas et al., GCN 23615) with AZT-33IK telescope of Sayan observatory
(Mondy). We started observations on Jan. 06 (UT) 13:53:44, i.e. 19 minutes
after burst trigger and continued observations on Jan. 07, Jan. 08 in
R-filter. Preliminary light curve obtained on Jan. 06 observation can be
found in http://grb.rssi.ru/GRB190106A/GRB190106A_LC_R.png
The photometry is based on nearby SDSS stars
SDSS-DR12_id R(Lupton)
J015920.22+235150.7 16.475
J015929.35+235237.5 15.774
GCN Circular 23660
Subject
GRB 190106A: Liverpool Telescope observations
Date
2019-01-09T18:23:02Z (6 years ago)
From
Luca Izzo at IAA-CSIC <luca.izzo@gmail.com>
L. Izzo, D. A. Kann (HETH-IAA/CSIC) A. de Ugarte Postigo (DARK/NBI & HETH-IAA/CSIC), M. Blazek, C. C. Thoene (HETH-IAA/CSIC) report:
We observed the field of GRB 190106A (Sonbas et al. GCN 23615) with the 2-m Liverpool Telescope located in La Palma, Spain. Observations started on January 6th at 21:10:35 UT (8.0 hours after the GRB trigger) and we obtained a series of 5x60s images in the g, r and i filters.
We clearly detect the optical afterglow (Lipunov et al. GCN 23616, Itoh et al. GCN 23617, Mao et al. GCN 23618, Reva et al., GCN 23620, Xin et al. GCN 23622, Quadri et al. GCN 23624, Hu et al. GCN 23627, Noschese et al. GCN 23628) for which we measure the following magnitudes:
g = 19.47 +- 0.03
r = 18.90 +- 0.09
i = 18.49 +- 0.26
The calibration was performed using nearby SDSS stars.
[GCN OPS NOTE(09jan19): Per author's request, the first citation was changed from
"Deich et al.; GCN Circ. 22710" to "Sonbas et al. GCN 23615".]
GCN Circular 23661
Subject
GRB 190106A: optical observations, possible jet break detection
Date
2019-01-09T18:42:15Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), P. Minaev (IKI), E. Klunko (ISTP),
I. Reva (FAPI), M. Krugov (FAPI), V. Rumyantsev (CrAO), R. Ya.
Inasaridze (AbAO), E. Mazaeva (IKI), A. Volnova (IKI) report on
behalf of IKI-FuN:
We continue observations the optical afterglow (e.g. Lipunov et al.
GCN 23616, Itoh et al. GCN 23617, Mao et al. GCN 23618, Reva et al., GCN
23620, Xin et al. GCN 23622, Quadri et al. GCN 23624, Hu et al. GCN
23627) of the GRB 190106A (Sonbas et al., GCN 23615) with AZT-33IK
telescope of Sayan observatory (Mondy), Zeiss-1000 1-m telescope of Tien
Shan Astronomical Observatory, and AS-32 (0.7m) telescope of Abastumani
Observatory. Preliminary photometry of the afterglow is following.
Date UT start t-T0 Filter Exp. OT Err. Observatory
(mid, days) (s)
2019-01-07 17:27:12 1.19251 R 63*60 20.27 0.08 AbAO
2019-01-08 11:07:16 1.91774 R 30*120 21.11 0.13 Mondy
2019-01-08 15:53:23 2.09628 R 12*120 21.1 0.3 CrAO
The photometry is based on nearby SDSS stars
SDSS-DR12_id R(Lupton)
J015920.22+235150.7 16.475
J015929.35+235237.5 15.774
Based on our previous results (GCNs 23620, 23638, 23640) and photometry
above we plot a light curve (
http://grb.rssi.ru/GRB190106A/GRB190106A_LC_R_fit.png ). We could
suggest the jet break at 1.5 +/- 0.5 days.
GCN Circular 23665
Subject
GRB 190106A: OSN Afterglow Observations
Date
2019-01-09T20:55:41Z (6 years ago)
From
Alexander Kann at IAA-CSIC <kann@iaa.es>
M. Blazek, D. A. Kann (both HETH/IAA-CSIC), A. de Ugarte Postigo
(HETH/IAA-CSIC and DARK/NBI), L. Izzo, and K. Bensch (all HETH/IAA-CSIC)
report:
We observed the optical afterglow of GRB 190106A (e.g., Yurkov et al.,
GCN #23614), detected by Swift (Sonbas et al., GCN #23615), with with
the T150 telescope of the Sierra Nevada Observatory (OSN). We obtained
18 x 300 s images in the Ic band from 5.02 to 6.47 hours after the GRB.
The afterglow is well-detected in each single image. We find it decays
between the beginning and end of our observing run.
Days Ic mag error
0.2091 18.54 0.05
0.2696 18.73 0.06
Magnitudes are given in the AB system. They were measured vs. four SDSS
comparison stars, using the transformation equations of Lupton (2005),
and transformed back into AB mags.
GCN Circular 23668
Subject
GRB 190106A: GMG continued observation
Date
2019-01-10T07:19:51Z (6 years ago)
From
Jirong Mao at Yunnan Obs <jirongmao_obs@ynao.ac.cn>
J. Mao, X.-L. Zhang, J.-M. Bai (YNAO) report:
We still monitor the afterglow of GRB 190106A with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories. The observation began at UT 13:57:39, 9th, Jan, 2019, about 72.2 hours after the trigger. We marginally detected the source. A very preliminary measurement provided a magnitude of R~21.2.
GCN Circular 23744
Subject
GRB 190106A: Discovery Channel Telescope observations
Date
2019-01-16T22:09:39Z (6 years ago)
From
Simone Dichiara at UMCP/NASA/GSFC <dichiara@umd.edu>
S.Dichiara (UMD, NASA-GSFC), P. Gatkine (UMD), J.M. Durbak (UMD),
E. Troja (UMD, NASA-GSFC), A. Kutyrev (UMD, NASA-GSFC), S. Veilleux (UMD),
report on behalf of a larger collaboration:
We observed at the optical counterpart of GRB 190106A (Sonbas et al. GCN
23615) using the Large Monolithic Imager (LMI) on the 4.3m Discovery
Channel Telescope (DCT) at Happy Jack, AZ. Observations start on January
08, 06:36:53 UT (about 41 hours after the Swift trigger) with SDSS r,
i and z filters.
We measured the following magnitudes:
Start Time Exposure Filter Magnitude
(hs from trigger) (s)
--------------------------------------------------------------------
41.036 3x120 r' 20.77 +- 0.03
41.157 3x120 i' 20.60 +- 0.05
41.279 3x120 z' 20.70 +- 0.15
---------------------------------------------------------------------
Magnitudes are calibrated against SDSS nearby stars:
J015939.43+235056.5 25.7308, J015938.69+235101.6, J015933.94+235145.7 and
J015923.06+235109.1.
We thank the staff of the Discovery Channel Telescope for assistance with
these observations.