[vsnet-grb-info 5883] GRB 080328, Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7533
SUBJECT: GRB 080328, Swift-BAT refined analysis
DATE:    08/03/28 21:11:42 GMT
FROM:    Craig Markwardt at NASA/GSFC/UMD  <craigm at milkyway.gsfc.nasa.gov>

H. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC),
E. Fenimore (LANL), N. Gehrels (GSFC), C. Markwardt (GSFC/UMD),
K. McLean (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), M. Perri (ASDC),
T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU),
J. Tueller (GSFC), T. Ukwatta (GWU)
(i.e. the Swift-BAT team):

Using the data set from T-120 to T+183 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 080328 (trigger
#307931) (Perri, et al., GCN Circ. 7525).  The BAT ground-calculated
position is RA, Dec = 80.490, 47.523 deg which is
    RA(J2000)  =  05h 21m 57.7s
    Dec(J2000) = +47d 31' 23.8"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 37%.

The mask-weighted light curve consists of about about ten major pulses
spread over ~100 sec.  T90 (15-350 keV) is 90.6 +- 1.5 sec (estimated
error including systematics).

The time-averaged spectrum from T-2.2 to T+117.5 sec is best fit by a
simple power-law model.  The power law index of the time-averaged
spectrum is 1.52 +- 0.04.  The fluence in the 15-150 keV band is
9.4 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from
T+9.3 sec in the 15-150 keV band is 5.5 +- 0.3 ph/cm2/sec.  All the
quoted errors are at the 90% confidence level.

The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/307931/BA/