[AAVSO-HEN] GRB 051105: Swift detection of a short burst

[grb at aavso.org]

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TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4188
SUBJECT: GRB 051105: Swift detection of a short burst
DATE:    05/11/05 07:17:42 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <Scott at 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.