GRB 051105
GCN Circular 4188
Subject
GRB 051105: Swift detection of a short burst
Date
2005-11-05T07:17:42Z (20 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
T. Mineo (IASF-Pa/INAF), L. Barbier (GSFC), S. Barthelmy (GSFC),
D. Burrows (PSU), M. Chester (PSU), N. Gehrels (GSFC), J. Kennea (PSU),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL),
G. Tagliaferri (OAB/INAF)
on behalf of the Swift team:
At 06:26:41 UT, Swift-BAT triggered and located GRB 051105 (trigger=162580).
The spacecraft slewed immediately. The BAT on-board calculated location
is RA,Dec 265.289d,+34.921d {17h 41m 09s,+34d 55' 15"} (J2000),
with an uncertainty of 3 arcmin (radius, 90% containment, stat+sys).
The BAT light curve shows a single spike with a total duration
of less than 128 msec. The peak count rate was ~3000 counts/sec (15-350 keV),
at 0.0 seconds after the trigger.
XRT began observing at 06:27:49.09 UT, 67.6 sec after BAT Trigger time.
The on-board detection algorithm failed to find a centroid due to low source
counts. The XRT light curve shows no X-ray emission in the field. Further
analysis will require processing of the XRT full telemetry data following
the next ground station contact.
The UVOT began observing at 06:27:48 UT, 66.5 sec after the BAT trigger.
Due to a delay in receipt of the initial data files, no results are
currently available. The V-band extinction in the direction of the
BAT GRB position is A_V = 0.11.
GCN Circular 4189
Subject
GRB 051105: Optical limit
Date
2005-11-05T10:14:49Z (20 years ago)
From
Ken ichi Torii at RIKEN <torii@ess.sci.osaka-u.ac.jp>
K. Torii (Osaka U.) reports on behalf of the ART collaboration:
The error region of the short GRB 051105 (Mineo et al. GCN 4188) was
observed by the 14 inch Automated Response Telescope. The first frame
was acquired starting at 2005 November 5, 09:11 UT (2.8 hours after
the burst) and 60 s integration in Ic band was repeated.
We do not identify an afterglow candidate within the BAT error circle
(GCN 4188) and derive the following 3 sigma upper limit relative to
USNO-B1.0 magnitude.
------------------------------------------
StartUT Filter Limit Nframes
------------------------------------------
09:12:30 Ic >18.1 19
------------------------------------------
GCN Circular 4190
Subject
GRB 051105: Swift-BAT refined analysis
Date
2005-11-05T12:03:06Z (20 years ago)
From
Hans Krimm at NASA-GSFC <krimm@milkyway.gsfc.nasa.gov>
J. Cummings (GSFC/NRC), L. Barbier (GSFC), S. Barthelmy (GSFC),
M. Chester (PSU), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
F. Marshall (GSFC), D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC),
on behalf of the Swift-BAT team:
Using the data set from T-60 to T+120 sec from the recent telemetry
downlink, we confirm the short duration of GRB 051105
(trigger #162580) (Mineo, et al., GCN 4188). The BAT ground position
is (RA,Dec) = 265.288,+34.904 {17h 41m 09s,+34d 55' 15"} [deg; J2000]
+-1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 89%.
The light curve shows a single peak with a fast rise and a slower decay.
T90 (15-350 keV) is (0.028 +- 0.004) sec. (estimated error including
systematics). All of the emission appears to be below 100 keV.
Spectral analysis including flux values will follow in a later circular.
GCN Circular 4194
Subject
GRB 051105: Swift-BAT improved refined analysis
Date
2005-11-05T16:22:19Z (20 years ago)
From
Louis M Barbier at NASA/GSFC/Swift <lmb@cosmicra.gsfc.nasa.gov>
L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
T. Mitani (ISAS), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC),
G. Sato (ISAS), M. Suzuki (Saitama), J. Tueller (GSFC),
on behalf of the Swift/BAT team:
We have re-analyzed GRB 051105 (GCN Circ 4188, Mineo et al., and
GCN Circ 4190, Cummings et al.) based on new time interval T0
to T0 + 0.120 sec.
The improved refined BAT ground position is (RA,Dec) = 265.277, 34.949,
{17h 41m 6.6s, 34d 56' 56.8"} [deg; J2000] +- 2.5 arcmin,
(90% containment). The partial coding was 81%.
The photon index of the time-averaged spectrum is 1.33 +- 0.35
in the time interval TO + 0.122 sec. The fluence in the 15-150 keV
band is (2.0 +- 0.46) x 10^-8 erg/cm2. The peak photon flux in the
same time window measured in the 15-150 band is (2.0 +- 0.43)
ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular 4349
Subject
GRB051105: optical observations
Date
2005-12-14T18:07:57Z (19 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
D. Sharapov, M. Ibrahimov (MAO), A.Pozanenko (IKI), V.Rumyantsev (CrAO) on
behalf of larger GRB follow up collaboration report:
We observed the error box of short duration GRB051105 (Mineo et al. GCN
4188) with 1.5m telescope of Maidanak Astronomical Observatory under good
weather condition (seeing ~1.1). Set of R images were taken starting on
Nov.5 (UT) 13:59, i.e. 7.6 hours after burst onset. The BAT refined error
box (Barbier et al. GCN 4194) is partially covered (~70%). The second set
of R images were taken on Dec.1 between (UT) 13:33 and 14:09.
The following R magnitudes of objects mentioned in GCN circulars
4195,4196,4201,4199,4202,4203,4204 were estimated at mean epoch of
observation (UT) Nov.5 14:17
---------------------------------------------------------
R.A. (J2000) Decl. (J2000) R(mag) ID
---------------------------------------------------------
17 41 10.00 +34 55 45.2 21.50 0.16 inside XRT S1
17 41 10.28 +34 55 41.1 22.54 0.40 outside XRT S1
17 41 03.28 +34 59 03.6 out of image radio
---------------------------------------------------------
The estimations are based on the comparison star magnitude R=17.0 used by
Piranomonte et al. (GCN 4201); coordinates in the table are taken from
Halpern at al. (GCN 4202).
No new/fading source was detected within ~70% of refined BAT error box
(Barbier et al. GCN 4194) between both epochs of our observations. The
photometry of extended galaxy mentioned by Klose, Laux, & Stecklum (GCN
4196) and details of the observations are following
Mid time, Exposure, Galaxy, Mag.(UL),Seeing
(UT) (s) R(mag)
Nov.5 14:17 1380 18.211 +/- 0.022 22.1 1.10"
Dec.1 13:51 1800 18.122 +/- 0.019 21.8 1.45"
Using available at this time observations we cannot confirm possible
re-brightening of the galaxy in the 2nd epoch. Detailed calibrations are
necessary and further monitoring of the galaxy would be encouraged. If
confirmed then it might be connected with SN associated with short duration
GRB051105.
The stacked images of both epochs can be found at
http://grb.rssi.ru/GRB051105/.
The message may be cited.