Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 4864

GRB 060312: Refined analysis of the Swift-BAT burst
2006-03-12T17:09:19Z (18 years ago)
Scott Barthelmy at NASA/GSFC <>
H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Grupe (PSU), D. Hullinger (BYU-Idaho), C. Markwardt (GSFC/UMD), 
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC),
G. Sato (ISAS), J. Tueller (GSFC)
on behalf of the Swift-BAT team:

Using the data set from T-300 to T+302 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 060312 (trigger #201391)
(Grupe, et al., GCN 4859).  The BAT ground-calculated position is RA,Dec =
45.777,+12.825 deg {3h 3m 6.5s,+12d 49' 29.6"} (J2000) +- 0.9 arcmin,
(radius, sys+stat, 90% containment).  The partial coding was 100%.
The mask-weighted lightcurve shows two main peaks at T-27 and T+7 sec.
The first peak starts at T-35 sec and the second ends at ~T+30 sec.
T90 (15-350 keV) is 43 +- 3 sec (estimated error including systematics).
The time-averaged spectrum from T-29.4 to T+22.0 is best fit by a power law
with an exponential cutoff.  This fit gives a photon index 1.35 +- 0.34, 
and Epeak of 62.8 +- 21.5 keV (chi squared 46.33 for 56 d.o.f.).  
For this model the total fluence in the 15-150 keV band is
1.8 +- 0.1 x 10^-06 erg/cm2 and the 1-sec peak flux measured from
T+5.63 sec in the 15-150 keV band is 1.5 +- 0.1 ph/cm2/sec.  
A fit to a simple power law gives a photon index of 1.85 +- 0.08
(chi squared 52.99 for 57 d.o.f.).  All the quoted errors are at the 90%
confidence level.
Looking for U.S. government information and services? Visit