GRB 110106B
GCN Circular 11525
Subject
GRB 110106B: Swift detection of a burst
Date
2011-01-06T21:41:40Z (14 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@milkyway.gsfc.nasa.gov>
B. Sbarufatti (INAF-OAB/IASFPA), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU),
N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), C. Gronwall (PSU),
C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC),
E. A. Hoversten (PSU), J. A. Kennea (PSU),
H. A. Krimm (CRESST/GSFC/USRA), V. Mangano (INAF-IASFPA),
C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC),
D. M. Palmer (LANL), T. Sakamoto (NASA/UMBC), C. J. Saxton (UCL-MSSL),
M. Stamatikos (OSU/NASA/GSFC), E. Troja (NASA/GSFC/ORAU) and
T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 21:26:17 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 110106B (trigger=441676). There was a 3.8 minute delayed slew.
The BAT on-board calculated location is
RA, Dec 134.196, +46.998 which is
RA(J2000) = 08h 56m 47s
Dec(J2000) = +46d 59' 52"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows several peaks
with a total duration of about 30 sec. The peak count rate
was ~1200 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 21:31:44.2 UT, 327.2 seconds after
the BAT trigger. Using promptly downlinked data we find an uncatalogued
X-ray source located at RA, Dec 134.15458, 47.00194 which is equivalent
to:
RA(J2000) = 08h 56m 37.10s
Dec(J2000) = +47d 00' 07.0"
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This
location is 102 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.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density consistent with the Galactic value of 2.37
x 10^20 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 332 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 none of
the XRT error circle. 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 mag. No correction has been made for the expected
extinction corresponding to E(B-V) of 0.03.
Burst Advocate for this burst is B. Sbarufatti (boris.sbarufatti AT brera.inaf.it).
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 11528
Subject
GRB110106B: Xinglong TNT upper limit
Date
2011-01-06T23:53:06Z (14 years ago)
From
L.P. Xin at NAOC <xlp@bao.ac.cn>
L.P. Xin, Z. X. Ling, Y.L. Qiu, J.Y. Wei, J. Wang, J.S. Deng,
C. Wu, X. H. Han on behalf of EAFON report:
We began to observe GRB110106B ( Sbarufatti et al., GCN 11525 )
with Xinglong TNT telescope at 21:35:02.5(UT), 9min after
the burst. A series of white and R-band images were obtained.
No any new source was found within the errorbox of X-ray
counterpart ( Sbarufatti et al., GCN 11525 ), down to 3 sigma
upper limit of R~20 mag at the mean time of 14 min after
the burst.
This message may be cited.
Thanks to the help of TNT observation assistant for this work.
For more information about Xinglong GRBs Follow-up
observations, please visit the website:
http://www.xinglong-naoc.org/grb/
GCN Circular 11532
Subject
GRB 110106B: Enhanced Swift-XRT position
Date
2011-01-07T01:31:08Z (14 years ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 2412 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 110106B, 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 = 134.15423, +47.00272 which is equivalent
to:
RA (J2000): 08h 56m 37.02s
Dec (J2000): +47d 00' 09.8"
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 11533
Subject
GRB 110106B: Swift-BAT refined analysis
Date
2011-01-07T01:56:03Z (14 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
T. N. Ukwatta (GWU) S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
B. Sbarufatti (INAF-OAB/IASFPA), M. Stamatikos (OSU), J. Tueller (GSFC),
(i.e. the Swift-BAT team):
Using the data set from T-61 to T+243 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 110106B (trigger #441676)
(Sbarufatti, et al., GCN Circ. 11525). The BAT ground-calculated position is
RA, Dec = 134.155, 47.005 deg, which is
RA(J2000) = 08h 56m 37.3s
Dec(J2000) = +47d 00' 17.5"
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 37%.
The mask-weighted light curve shows 3 main overlapping peaks starting
at ~T-6 sec and ending at ~T+23 sec. T90 (15-350 keV) is 24.8 +- 4.8 sec
(estimated error including systematics).
The time-averaged spectrum from T-10.8 to T+23.5 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.76 +- 0.11. The fluence in the 15-150 keV band is 2.0 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+4.87 sec in the 15-150 keV band
is 2.1 +- 0.3 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/441676/BA/
GCN Circular 11534
Subject
GRB 110106B: WHT candidate afterglow
Date
2011-01-07T02:34:14Z (14 years ago)
From
Andrew Levan at U.of Leicester <A.J.Levan@warwick.ac.uk>
A.J. Levan (U. Warwick), N.R. Tanvir, K. Wiersema (U. Leicester),
L. Coccato (ESO) report for a larger collaboration:
We observed the location of GRB 110106B (Sbarufatti et al. GCN
11525) with the William Herschel Telescope and ACAM. Observations
were obtained in the i-band, and began at 7 Jan, 00:41 UT, approximately
3 hours after the burst. Within the refined XRT localization
(Beardmore et al. GCN 11532) we find a source at
RA(J2000) 08:56:37.02
DEC(J2000) 47:00:09.8
with an uncertainty of ~0.5" in each axis.
The source appears to be extended, but may include a point source
contribution on top of the extended emission. Photometry of the
object suggests i~22.5. This is marginally brighter than the limit
of SDSS observations of the region, and suggests some afterglow
contribution to the observed flux at this time.
Further observations are encouraged."
GCN Circular 11537
Subject
GRB 110106B: Liverpool Telescope observations
Date
2011-01-07T11:12:06Z (14 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB),
I.A. Steele, C.G. Mundell, S. Kobayashi (Liverpool JMU),
A. Gomboc (U. Ljubljana) on behalf of a large collaboration report:
The 2-m Liverpool Telescope automatically began observing
GRB 110106B (Sbarufatti et al. GCN Circ. 11525) on January 06,
21:35:46 UT, 9.5 minutes from the GRB trigger time with the
SDSS filters riz.
Within the enhanced XRT error circle (Beardmore et al. GCN Circ. 11532)
we do not find any source down to the following limiting magnitudes.
Mid time from Tot Exposure Filter Limiting Magnitude
trigger (s) (s)
------------------------------------------------------------
2594 720 z > 20.4
2300 720 i > 21.4
2620 1260 r > 22.5
------------------------------------------------------------
Calibration is against some nearby SDSS stars.
The non-detection of the extended object mentioned by Levan et
al. (GCN Circ. 11534) with i~22.5 is consistent with our limit.
GCN Circular 11538
Subject
GRB 110106B Gemini-N galaxy redshift
Date
2011-01-07T11:29:52Z (14 years ago)
From
Ryan Chornock at Harvard <rchornock@cfa.harvard.edu>
R. Chornock, E. Berger (Harvard), and D. B. Fox (Penn. State) report on
behalf of a larger collaboration:
We used GMOS on Gemini-North to observe the extended object present in
the XRT error circle of GRB 110106B (Sbarufatti et al., GCN 11525;
Beardmore et al. GCN 11532) discovered by Levan et al. (GCN 11534). We
obtained 2x1500s of spectroscopy using the R400 grating to cover the
spectral range 3900-8100 Angstroms, starting on January 7.38 UT.
Emission lines from [O II], H-beta, and [O III] are present at a common
redshift of z=0.618.
GCN Circular 11540
Subject
GRB 110106B: Gemini-North / WHT detection of a fading afterglow
Date
2011-01-07T15:01:07Z (14 years ago)
From
Edo Berger at Harvard <eberger@cfa.harvard.edu>
E. Berger (Harvard), A.J. Levan (U. Warwick), R. Chornock (Harvard), and
N.R. Tanvir (U. Leicester) report:
"In addition to the spectroscopic observations reported in GCN #11538 we
also obtained i-band imaging of the afterglow candidate of GRB 110106B found
with the WHT (GCN #11534) with Gemini-N / GMOS. A total of 900 sec were
obtained on source at a mean epoch of 2011 Jan 7.347 UT (10.89 hours after
the burst and 7.64 hours after the WHT observation). Digital image
subtraction of the Gemini and WHT observations reveals a fading source
located at (J2000):
RA = 08:56:37.267
DEC = +47:00:10.49
with an uncertainty of about 0.2" in each coordinate. This position is
about 1.5" due east of the galaxy noted in GCN #11534, whose redshift is
0.618 (GCN #11538). At this redshift the corresponding projected offset is
about 10 kpc. We note that emission is still detected at the position of
the afterglow, indicating that an association with an underlying host
unrelated to the nearby galaxy may still be possible."
GCN Circular 11541
Subject
GRB 110106B: Swift-XRT refined Analysis
Date
2011-01-07T15:12:25Z (14 years ago)
From
Boris Sbarufatti at INAF-OAB/IASFPA <boris.sbarufatti@brera.inaf.it>
B. Sbarufatti (INAF-OAB/IASFPA) reports on behalf of the Swift-XRT
team:
We have analysed 6.2 ks of XRT data for GRB 110106B (Sbarufatti et al.
GCN Circ. 11525), from 339 s to 30.3 ks after the BAT trigger. The
data comprise 24 s in Windowed Timing (WT) mode with the remainder in
Photon Counting (PC) mode. The enhanced XRT position for this burst was
given by Beardmore et al. (GCN. Circ 11532).
The light curve can be modelled with a series of power-law decays. The
light curve initially rises, with an index alpha=-1.5 (+0.0, -1.3). At
T+470 s it breaks to an alpha of 0.64 (+/-0.07) before breaking again
at T+14354 s to a final decay with index alpha=1.6 (+1.0, -0.5).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.20 (+/-0.16). The
best-fitting absorption column is 2.08 (+0.44, -0.22) x 10^21 cm^-2,
in excess of the Galactic value of 2.4 x 10^20 cm^-2 (Kalberla et al.
2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion
factor deduced from this spectrum is 3.8 x 10^-11 (6.1 x 10^-11) erg
cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 2.08 (+0.44, -0.22) x 10^21 cm^-2
Galactic foreground: 2.4 x 10^20 cm^-2
Excess significance: 15.4 sigma
Photon index: 2.20 (+/-0.16)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00441676.
This circular is an official product of the Swift-XRT team.
GCN Circular 11543
Subject
GRB 110106B: Fermi GBM detection
Date
2011-01-07T16:12:06Z (14 years ago)
From
Narayana Bhat at U Alabama/Huntsville/GBM <Narayana.Bhat@nasa.gov>
P. N. Bhat (UAH)
reports on behalf of the Fermi GBM Team:
"At 21:26:16.08 UT on 06 January 2011, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 110106B (trigger 316041978 / 110106893).
which was also detected by the Swift/BAT (Sbarufatti et al. 2011, GCN 11525)
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight was 103 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve consists of several pulses
with a duration (T90) of about 35.5 s (50-300 keV).
The time-averaged spectrum from T0-26.6 s to T0+25.6 s is
adequately fit by a simple power law function
with index -1.61 +/- 0.04 (C-stat 849 for 242 d.o.f.).
The event fluence (10-1000 keV) in this time interval is
(5.90 +/- 0.44)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+16.13 s in the 10-1000 keV band
is 2.77 +/- 0.27 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
GCN Circular 11548
Subject
GRB 110106B: MASTER early optical observations
Date
2011-01-09T21:09:55Z (14 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina,
D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov,
D.Zimnukhov, M. Kornilov
Sternberg Astronomical Institute, Moscow State University
V.Krushinski, I.Zalozhnich, A. Popov
Ural State University, Kourovka
K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres,
S.Yazev, N.M.Budnev,
Irkutsk State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina
Blagoveschensk Educational State University, Blagoveschensk
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Kislovodsk was pointed to the GRB110106B (Sbarufatti et al.,
GCN Circ 11525) 23 sec s after notice time and 44 sec after GRB time at
2011-01-06 21:27:01.696 UT. On our first (10s exposure) set we haven`t
found optical transient at Gemini position (Berger et al.,GCN Circ
11540).
The upper limit on both telescopes has been about 16.0 mag
The message may be cited.
We have ~5 hours observations.
The redaction are continueted.
mailto: lipunov@sai.msu.ru
GCN Circular 11552
Subject
GRB 110106B: early optical and near-IR observations
Date
2011-01-11T11:38:30Z (14 years ago)
From
Javier Gorosabel at IAA-CSIC <jgu@iaa.es>
J. Gorosabel, A.J. Castro-Tirado, M. Jelinek (IAA-CSIC, Granada), P. Kubanek (U. Valencia & IAA-CSIC, Granada), M. Visus, R. Tata (IAC, Obs. del Teide, Tenerife), A. Sota (OSN, Granada), S. Mottola, C. Faber (DLR, German Aerospace Center, Berlin), report on behalf of a larger collaboration:
"We have carried out VRIH-band observations of the GRB 110106B XRT error circle (Sbarufatti et al. GCN Circ. 11525) using the 0.6m BOOTES2, 1.23m CAHA, the 1.5m OSN, the 0.82m IAC80 and the 1.5m TCS telescopes, as follows:
Telescope Date Jan.2011 Post-GRB-time Filter Lim.Mag.
(UT) (min) (3sigma)
-------------------------------------------------------------------------------------------
0.6m BOOTES2 6.90041-6.90212 10.3-12.8 R 16.5
1.23m CAHA 6.90179-6.91123 12.3-25.9 R 20.4
1.5m OSN 6.90258-6.91564 13.4-32.2 I 21.0
1.23m CAHA 6.91184-6.96185 26.8-98.8 V 20.5
IAC80 6.91533-6.92520 31.8-46.0 R 20.3
1.5m TCS 6.94378-6.96465 72.8-102.8 H 18.0
--------------------------------------------------------------------------------------------
No optical object is detected coincident with the optical afterglow position (Levan et al. GCN Circ. 11534, Berger et al. GCN Circ. 11540) down to the limiting magnitudes (Vega system) displayed in the above table."
GCN Circular 11555
Subject
GRB 110106B: MASTER optical observations
Date
2011-01-12T15:56:55Z (14 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina,
D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov,
D.Zimnukhov, M. Kornilov, V.Shumkov, S.Shurpakov
Sternberg Astronomical Institute, Moscow State University
V.Krushinski, I.Zalozhnich, A. Popov
Ural State University, Kourovka
K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres,
S.Yazev, N.M.Budnev,
Irkutsk State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina
Blagoveschensk Educational State University, Blagoveschensk
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in
Kislovodsk was pointed to the GRB110106B (Sbarufatti et al., GCN Circ 11525)
23 sec s after notice time and 44 sec after GRB time at 2011-01-06
21:27:01.696 UT (Gorbovskoy et al., GCN Circ. 11548). On our first (10s
exposure) set we haven`t found optical transient at Gemini position (Berger et al.,GCN Circ 11540).
The upper limit on both telescopes has been about 16.0 mag.
The composed images give next results:
Lim Exp Start time Last image Telescope
18.9. 14220 2011-01-06 21:54:34.262 2011-01-07 03:24:31.621 East
19.2. 13860 2011-01-06 21:57:51.527 2011-01-07 02:51:35.346 West
The message may be cited.
mailto: lipunov@sai.msu.ru
GCN Circular 11599
Subject
GRB 110106B, radio observations
Date
2011-01-24T18:17:14Z (14 years ago)
From
Dale A. Frail at NRAO <dfrail@nrao.edu>
Dale A. Frail (NRAO) report on behalf of a larger collaboration:
"We used the Expanded Very Large Array (EVLA) to observe the field of
view towards GRB 110106b, detected by Swift and Fermi GBM (GCN
11525, 11532, 11533, 11543), on 2011 January 22.22 UT at a center
frequency of 8.46 GHz. No radio afterglow is detected. At the
position of the optical afterglow (GCN 11540) the flux density is
measured to be -27 +/- 24 uJy.
No further observations are planned.