TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3099
SUBJECT: GRB050315:  Swift-BAT Refined analysis
DATE:    05/03/16 05:10:29 GMT
FROM:    Takanori Sakamoto at NASA/GSFC  <takanori@milkyway.gsfc.nasa.gov>

T. Sakamoto (GSFC/NRC), S. Barthelmy, L. Barbier (GSFC), 
J. Cummings (GSFC/NRC), E. Fenimore (LANL), R. Fink, 
N. Gehrels (GSFC), S. Holland (GSFC/USRA), 
D. Hullinger (GSFC/UMD), K. Hurley (UCB), H. Krimm (GSFC/USRA), 
C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), 
S. Piranomonte (ASDC), G. Sato (ISAS), A. Smale (NASA HQ), 
M. Suzuki (Saitama), J. Tueller (GSFC) 
on behalf of the Swift-BAT team: 

Analysis of the available data for the Swift-BAT GRB050315 
(Parsons et al., GCN Circ 3094) yields a fluence of > 2.8x10^-6 
erg/cm2 in the 15-350 keV band and a peak flux of 2.5 ph/cm2/sec 
(also 15-350 keV).  The photon index of the 1-s peak spectrum (T0+25 sec.) 
is 2.5 +- 0.3 (90% confidence).  Although there is a data gap, 
the time averaged spectrum also shows a soft spectrum.  
This appears to be a soft X-ray-rich GRB.  

We are planning a further circular when more complete data 
are avaliable.