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GCN Circular 3162

Subject
Swift-BAT detection of GRB 050401
Date
2005-04-01T15:25:21Z (19 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).
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