GCN Circular 3117

Swift Detection of GRB 050319

H. Krimm (GSFC/USRA), M. Still (GSFC/USRA), S. Barthelmy, L. Barbier (GSFC),
S. Campana (INAF-OAB), M. Capalbi (ASDC), M. Chester (PSU),
J. Cummings (GSFC/NRC), E. Fenimore (LANL),
N. Gehrels (GSFC),  M. R. Goad, O. Godet (U.Leicester), J. Greiner (MPE),
D. Grupe (PSU), D. Hullinger (GSFC/UMD), V. La Parola , V. Mangano 
(INAF-IASF/Palermo),
C. Markwardt (GSFC/UMD), P. Meszaros, D. C. Morris,
J. A. Nousek (PSU), K. Page (U.Leicester), D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC/NRC), G. Sato (ISAS), M. Suzuki (Saitama), 
G.Tagliaferri (INAF-OAB),
J. Tueller (GSFC)
report on behalf of the Swift-BAT and Swift-XRT teams:

At 09:31:18.44 UT, the Swift Burst Alert Telescope (BAT) triggered and
located on-board GRB 050319.  The burst was 37 degrees off the BAT 
boresight.  The spacecraft executed an immediate slew and was on 
target by 09:32:45.53 UT at which time the XRT began taking data in 
Auto State.  On-board software recognized a bright source at location

RA 154.2016d {+10h 16m 48s} (J2000),
Dec  +43.5463d {+43d 32' 47"} (J2000)

We estimate an uncertainty of 7 arcseconds.

The burst lightcurve as seen in the BAT has a single peak with a fast 
rise, exponential decay.  The estimated duration is 15 seconds.  The 
peak count rate is 2,000 counts/second (15-350 KeV)