GRB 190114B
GCN Circular 23686
Subject
GRB 190114B: Swift detection of a burst
Date
2019-01-14T19:48:11Z (6 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
M. H. Siegel (PSU), D. N. Burrows (PSU), J.D. Gropp (PSU),
J. A. Kennea (PSU), N. J. Klingler (PSU), H. A. Krimm (NSF/USRA),
N. P. M. Kuin (UCL-MSSL), S. J. LaPorte (PSU), A. Y. Lien (GSFC/UMBC),
M. J. Moss (George Washington University), K. L. Page (U Leicester),
B. Sbarufatti (PSU) and A. Tohuvavohu (PSU) report on behalf of the
Neil Gehrels Swift Observatory Team:
At 19:31:12 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 190114B (trigger=883818). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 174.883, +18.877 which is
RA(J2000) = 11h 39m 32s
Dec(J2000) = +18d 52' 36"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a weak pulse
with a duration of about 20 sec. Also, there is a possible precursor
at ~T-75 s. The peak count rate was ~800 counts/sec (15-350 keV),
at ~4 sec after the trigger.
The XRT began observing the field at 19:33:49.6 UT, 157.5 seconds after
the BAT trigger. Using promptly downlinked data we find a fading,
uncatalogued X-ray source located at RA, Dec 174.87349, 18.89230 which
is equivalent to:
RA(J2000) = 11h 39m 29.64s
Dec(J2000) = +18d 53' 32.3"
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This
location is 63 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.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density consistent with the Galactic value of 1.75
x 10^20 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 250 seconds with the U filter starting
157 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the
XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The
8'x8' region for the list of sources generated on-board covers 100% of the XRT
error circle. The list of sources is typically complete to about 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.02.
Burst Advocate for this burst is M. H. Siegel (siegel AT swift.psu.edu).
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 23691
Subject
GRB 190114B: Enhanced Swift-XRT position
Date
2019-01-14T21:53:07Z (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 1925 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 190114B, 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 = 174.87422, +18.89079 which is equivalent
to:
RA (J2000): 11h 39m 29.81s
Dec (J2000): +18d 53' 26.9"
with an uncertainty of 2.3 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 23694
Subject
GRB 190114B: BOOTES-4/MET optical afterglow detection
Date
2019-01-14T22:31:44Z (6 years ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>
E. Fernandez-Garcia, Y.-D. Hu, X.-Y.Li, , A. Ayala, A. J. Castro-Tirado
(IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de
Malaga), ��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 190114B by Swift/BAT (Siegel et al. GCNC
23686), the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical
Observatory (China) obtained follow-up�� observations starting at
19:53:24 UT (~0.37 hr after trigger). Within the enhaced Swift/XRT
position (Goad et al. GCNC 23691) an optical source with a preliminary
magnitude of 20.3 mag (clear filter) is detected, fading in brightness
in the late-time images, which we suggest as the optical afterglow to
GRB 190114B at coordinates (J2000) RA = 11:39:29.81, Dec =+18:53:28.1
(+/- 1"). Observations are ongoing."
GCN Circular 23696
Subject
GRB 190114B: Mondy optical afterglow detection
Date
2019-01-14T22:46:53Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva (IKI), A. Volnova (IKI), S.
Belkin (IKI) report on behalf of IKI-FuN:
We observed the field of the GRB 190114B (Siegel et al., GCN 23686) with
AZT-33IK telescope of Sayan observatory (Mondy). We started observations
on Jan. 14 (UT) 20:28:30, i.e. 57 minutes after burst trigger. Within
the enhanced XRT position (Goad et al., GCN 23691) we detect the object
which is absent in SDSS catalog. Coordinates of the object are (J2000)
11:39:29.84 +18:53:27.8 with uncertainty 0.5 arcsec in both coordinates. The
brightens of the object is R ~ 20.1m at (UT) 20:28:30. We suggest the object
is the afterglow of GRB 190114B. The photometry is based on nearby SDSS
DR12 stars, Lupton transformation.
.
GCN Circular 23703
Subject
GRB 190114B: GWAC-F60B upper limit
Date
2019-01-15T03:15:45Z (6 years ago)
From
L.P. Xin at NAOC <xlp@nao.cas.cn>
L. P. Xin, Y. J. Xiao, P. P. Zhang, R. S. Zhang, J. Wang, J. Y. Wei,
E. W. Liang, X. G. Wang, 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 started to observe GRB 190114B ( Siegel et al., GCN 23686 )
with GWAC-F60B 60cm optical telescope at 19:46:26 UT,
Jan. 14th 2019, about 14 min after the burst.
The afterglow reported by ( Goad et al., GCN 23691; Fernandez-Garcia et al., GCN 23694;
Pozanenko et al., GCN 23696) was not detected in R band images.
The upper limit is estimated to be about 18.3 mag calibrated by nearby USNO-B1.0 stars.
GWAC-F60B is operated by Guangxi university and NAOC, CAS, at Xinglong observatory, China.
The message may be cited.
GCN Circular 23705
Subject
GRB 190114B: MITSuME Akeno optical upper limits
Date
2019-01-15T05:48:16Z (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 190114B (M. Siegel et al., GCN #23686)
with the optical three color (g', Rc, and Ic)
CCD cameras attached to the MITSuME 50 cm telescope at Akeno
Observatory,Yamanashi, Japan.
The observation started on 19:33:01 UT which corresponds to 109 sec
after the trigger.
We did not find any new point source within the enhanced XRT circle
(Goad et al., GCN #23691; Fernandez-Garcia et al., GCN #23694;
Pozanenko et al., GCN #23696; Xin et al., GCN #23703) in all three bands.
We obtained following 5 sigma limits for the magnitudes.
T0+[sec] MID-UT T-EXP[sec] g' Rc Ic
-------------------------------------------------------------------------------------------------------
109 19:37:35 480 >19.4 >18.7 >18.2
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used UCAC-4 catalog for flux calibration.
GCN Circular 23713
Subject
GRB 190114B: NOT optical counterpart
Date
2019-01-15T12:53:20Z (6 years ago)
From
Jonatan Selsing at DARK/NBI <jselsing@dark-cosmology.dk>
J. Selsing (DAWN/NBI and DAWN/DTU), A. de Ugarte Postigo (HETH/IAA-CSIC
and DARK/NBI), and S. Dyrbye (NOT), report on behalf of a larger
collaboration:
We have observed the optical afterglow of GRB GRB190114B (Siegel et al.,
GCN 23686; Goad et al., GCN 23691) at the 2.5-m Nordic Optical Telescope
(NOT). We have obtained an griz-band imaging sequence using the ALFOSC
instrument, with 3x300s exposure in gri-band and 5x200s in z-band.
Observations began at 01:51:42 UT, on the night of the 14th of January,
6.3 hr after the BAT trigger.��
In the images we confirm the detection of the optical counterpart in
Fernandez-Garcia et al. (GCN 23694) and Pozanenko et al. (GCN 23696) and
report further fading. The source is located at:
RA (J2000.0) = 11:39:29.823
DEC (J2000.0) = +18:53:28.19
with the astrometric solution calibrated against the 2MASS catalog.��
We calibrate the photometric zeropoints against the Pan-STARRS catalog
and calculate the following magnitudes for the optical counterpart:
g = 21.61 +- 0.13 AB mag��
r = 21.15 +- 0.09 AB mag��
i = 20.96 +- 0.04 AB mag��
z = 20.59 +- 0.08 AB mag
GCN Circular 23720
Subject
GRB 190114B: Swift/UVOT Upper Limits
Date
2019-01-15T16:53:38Z (6 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190114B
158 s after the BAT trigger (Siegel et al., GCN Circ. 23686).
No optical afterglow consistent with the enhanced XRT position
(Goad et al. GCN Circ. 23691) or the position of the faint
optical counterpart (Fernandez-Garcia et al., GCN Circ. 23694;
Pozanenko et al., GCN Circ. 23696, Selsing et al. GCN Circ. 23713)
is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
u_FC 158 408 246 >20.2
v 464 1976 175 >18.5
b 414 2075 214 >19.9
u 158 2050 568 >20.4
w1 513 2025 194 >19.7
m2 786 2000 117 >18.9
w2 440 2100 194 >19.8
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 23721
Subject
GRB 190114B, Swift-BAT refined analysis
Date
2019-01-15T16:59:37Z (6 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
J. R. Cummings (CPI), S. D. Barthelmy (GSFC),
H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC),
C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Sakamoto (AGU), M. H. Siegel (PSU),
M. Stamatikos (OSU), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 190114B (trigger #883818)
(Siegel et al., GCN Circ. 23686). The BAT ground-calculated position is
RA, Dec = 174.868, 18.882 deg which is
RA(J2000) = 11h 39m 28.3s
Dec(J2000) = +18d 52' 53.5"
with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 63%.
The mask-weighted light curve shows a weak pulse that starts at ~T0 and ends
at ~T+30 s. The possible precursor seen at ~T-75 s (Siegel et al., GCN Circ. 23686)
turns out to be purely instrumental and is not related to this GRB.
T90 (15-350 keV) is 26.5 +- 6.7 sec (estimated error including systematics).
The time-averaged spectrum from T-1.2 to T+27.9 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.98 +- 0.28. The fluence in the 15-150 keV band is 5.1 +- 1.0 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+3.62 sec in the 15-150 keV band
is 0.5 +- 0.2 ph/cm2/sec. 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/883818/BA/
GCN Circular 23722
Subject
GRB 190114B: optical afterglow observations in Mondy and Abastumani observatories
Date
2019-01-15T17:32:45Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), A. Pozanenko (IKI), E. Mazaeva (IKI), E. Klunko
(ISTP), S. Belkin (IKI), R. Ya. Inasaridze (AbAO), V.R. Ayvazian
(AbAO), G. V. Kapanadze (AbAO), report on behalf of IKI-FuN:
We observed the field of the GRB 190114B (Siegel et al., GCN 23686)
with AZT-33IK telescope of Sayan observatory (Mondy), and AS-32
(0.7m) telescope of Abastumani Observatory. The optical afterglow
(Fernandez-Garcia et al., GCN 23694; Pozanenko et al., GCN 23696;
Selsing et al., GCN 23713) is detected in stacked images. Preliminary
photometry is following.
Date UT start t-T0 Filter Exp. OT Err. Observatory
(mid, days) (s)
2019-01-14 20:28:30 0.10233 R 30*120 19.87 0.06 Mondy
2019-01-15 01:04:51 0.24212 R 18*60 20.40 0.25 AbAO
The photometry is based on nearby SDSS stars
SDSS id R_Lupton
J113927.36+185157.2 17.094 0.014
J113940.10+185315.3 17.015 0.015
J113939.20+185354.8 17.954 0.018
The photometry might be affected by a nearby galaxy (r'=20.534, z_ph =
0.32813+/-0.08585) at a distance of 5.6 arc seconds.
GCN Circular 23723
Subject
GRB 190114B: Liverpool Telescope near-IR observations
Date
2019-01-15T18:31:09Z (6 years ago)
From
Luca Izzo at IAA-CSIC <luca.izzo@gmail.com>
M. Blazek, L. Izzo (HETH-IAA/CSIC) A. de Ugarte Postigo (DARK/NBI & HETH-IAA/CSIC), D. A. Kann, C. C. Thoene (HETH-IAA/CSIC) report:
We observed the field of GRB 190114B (Siegel et al. GCN 23686) with the IO:I camera mounted on the 2-m Liverpool Telescope located in La Palma, Spain. Observations started on January 15th at 02:51:47 UT (7.34 hours after the GRB trigger) and we obtained a series of 10x60s images in the H filter.
We detect the faint optical afterglow (Fernandez-Garcia et al. GCN 23694, Pozanenko et al. GCN 23696, Selsing et al. GCN 23713, Volnova et al., GCN 23722) for which we measure the following magnitude:
H(AB) = 20.35 +- 0.34 mag
The calibration was performed using four nearby 2MASS stars.
GCN Circular 23730
Subject
GRB 190114B: Swift-XRT refined Analysis
Date
2019-01-16T02:09:21Z (6 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), A. Tohuvavohu (PSU), S. J.
LaPorte (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U.
Leicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB), P.
D'Avanzo (INAF-OAB) and M.H. Siegel report on behalf of the Swift-XRT
team:
We have analysed 2.4 ks of XRT data for GRB 190114B (Siegel et al. GCN
Circ. 23686), from 165 s to 104.3 ks after the BAT trigger. The data
are entirely in Photon Counting (PC) mode. The enhanced XRT position
for this burst was given by Goad et al. (GCN Circ. 23691).
The light curve can be modelled with a power-law decay with a decay
index of alpha=2.1 (+/-0.4).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.99 (+0.34, -0.14). The
best-fitting absorption column is consistent with the Galactic value
of 1.7 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed
(unabsorbed) 0.3-10 keV flux conversion factor deduced from this
spectrum is 3.2 x 10^-11 (3.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 1.7 (+/-4.8) x 10^20 cm^-2
Galactic foreground: 1.7 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index: 1.99 (+0.34, -0.14)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00883818.
This circular is an official product of the Swift-XRT team.
GCN Circular 23743
Subject
GRB 190114B: continued optical observations in Mondy
Date
2019-01-16T17:06:37Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), A. Pozanenko (IKI), E. Mazaeva (IKI), E. Klunko
(ISTP), S. Belkin (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of the GRB 190114B (Siegel et al., GCN 23686)
with AZT-33IK telescope of Sayan observatory (Mondy) starting on Jan. 15
(UT) 21:06:04. The optical afterglow (e.g. Fernandez-Garcia et al., GCN
23694; Pozanenko et al., GCN 23696; Selsing et al., GCN 23713) is
marginally detected in a stacked image. Preliminary photometry is following.
Date UT start t-T0 Filter Exp. OT Err.
(mid, days) (s)
2019-01-15 21:06:04 1.08672 R 30*120 22.2 0.35
The photometry is based on nearby SDSS stars
SDSS id R_Lupton
J113927.36+185157.2 17.094 0.014
J113940.10+185315.3 17.015 0.015
J113939.20+185354.8 17.954 0.018