GCN Circular 2909
Subject
GRB 041223 Fluence measured by Swift-BAT
Date
2004-12-25T01:41:53Z (19 years ago)
From
Craig Markwardt at NASA/GSFC/UMD <craigm@milkyway.gsfc.nasa.gov>
GRB041223 Fluence measured by Swift-BAT
C. Markwardt (GSFC/UMD), M. Suzuki (Saitama), L. Barbier, S. Barthelmy (GSFC),
J. Cummings (GSFC), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), K. McLean, D. Palmer (LANL),
A. Parsons (GSFC), G. Sato (ISAS), J. Tueller (GSFC),
on behalf of the Swift BAT team:
GRB 041223 (Tueller et al., GCN #2898) was a spectrally hard burst.
Fits to the total Swift-BAT burst spectrum are consistent with a power
law, with a photon index of 1.05-1.15.
The BAT team did not quote a total band fluence in GCN 2898, due to
uncertainty in the response at high energies. Now, with further
simulations and spectral analysis, we estimate that the 15-350 keV
fluence was ~5E-5 erg/cm^2. The peak flux was 3E-6 erg/cm^2/s (15-350
keV; 1 s sampling), which is dominated by the highest energy band.