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GCN Circular 2992

Subject
GRB050128 Swift-BAT observations
Date
2005-01-28T11:10:10Z (19 years ago)
From
Neil Gehrels at GSFC <gehrels@gsfc.nasa.gov>
J. Cummings (GSFC), G. Sato (ISAS), L. Antonelli (INAF-OAR), S. Barthelmy, 
L. Barbier (GSFC), P. Boyd (GSFC-UMBC), E. Fenimore (LANL), N. Gehrels 
(GSFC), D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), F. Marshall (GSFC), 
C. Markwardt (GSFC/UMD), K. McLean (LANL), M. Capalbi (ASDC), D. Palmer 
(LANL), A. Parsons (GSFC), T. Sakamoto (GSFC), M. Suzuki (Saitama), J. 
Tueller (GSFC), S. Zane (MSSL) on behalf of the Swift-BAT team:

At 04:19:54 UT, the Swift Burst Alert Telescope (BAT) triggered and 
located on-board GRB050128.  The spacecraft autonomously slewed to the 
burst and an x-ray afterglow source was detected by XRT (GCN 2991, 
Antonelli et al.).

The BAT on-board calculated location is RA,Dec 219.587, -34.762 (J2000) 
with an uncertainty of 3 arcmin (radius, 3-sigma, including a systematic 
uncertainty dominated by the GRB being 51 deg off axis).  This is 39 
arcsec from the XRT position.  The lightcurve is multi-peaked with a T90 
duration of 13.8 sec.  The fluence is 4.5e-6 erg/cm^2 and the peak flux (1 
sec interval) is 4.6 ph/cm^2/s in the 15-350 keV band.  The spectrum is 
consistent with a power-law of photon index 1.5 +- 0.05.

[GCN OPS NOTE (28jan05):  As per D.Burrows request, the "C.Milvia" 
was changed to "M. Capalbi".]
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