GCN Circular 3162
Subject
Swift-BAT detection of GRB 050401
Date
2005-04-01T15:25:21Z (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), J. Norris (GSFC),
J. Nousek (PSU), D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC/NRC), G. Sato (ISAS), M. Suzuki (Saitama),
J. Tueller (GSFC)
on behalf of the Swift team:
At 14:20:15 UT Swift-BAT triggered on burst GRB 050401 (trigger=113120).
The BAT-derived position is RA,Dec=247.880,+2.184 (J2000). We note this
is 42 arcsec from the XRT Position GCN Notice. The lightcurve
shows 5 main peaks with a total burst duration of 38 sec. The first peak
started about 9 sec before the trigger, and the fifth peak started
at T+23 sec. The peak count rate was 5000 cnts/sec. This burst
was 56 deg of the BAT bore sight (<10% coding). We note that
the Swift Star Trackers were locked at the time of the trigger and
all initial inspections indicate that the attitude solution for the s/c
is normal (unlike yesterday's episode).