GRB 050219

P. Romano (INAF-OAB), M. Perri (ASDC), A. Beardmore (U. Leicester), V. 
Mangano (INF-IASF/Palermo), D. N. Burrows, J. E. Hill,  (PSU), B. Zhang (U. 
Nevada), and N. Gehrels (GSFC) report on behalf of the Swift XRT team:

The Swift BAT instrument detected a GRB at 12:40:01 UT on 19 February 
2005.  The observatory executed an automated slew to the BAT position and 
the XRT began taking data at 12:41:33.38 UT.  The XRT was in Auto state and 
reports a prompt position of:

GRB-RA= 166.41396, GRB-DEC= -40.68277

RA(J2000) = 11h 05m 39.4s

DEC(J2000) = -40:40:58.0
We estimate an uncertainty of about 6 arcseconds.

We have not examined the XRT image yet due to technical problems, but at 
first glance, this appears to be a valid position.

D. Hullinger (GSFC/UMD), S. Barthelmy, L. Barbier, J. Cummings (GSFC),
E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), J. Norris (GSFC), J. Nousek (PSU),
D. Palmer (LANL), A. Parsons (GSFC), M. Perri (ASDC), T. Sakamoto (GSFC),
G. Sato (ISAS), A. Smale (NASA HQ), M. Suzuki (Saitama),
J. Tueller (GSFC), B. Zhang (UNLV)   on behalf of the Swift-BAT team:

At 12:40:01 UT, the Swift Burst Alert Telescope (BAT) triggered and
located on-board GRB050219.  The spacecraft autonomously slewed
to the burst location (started at T+12 sec and was on target at T+78 sec).
The XRT and UVOT instruments then began their standard set
of pre-programmed observing sequences.

Using the time interval of the burst before the slew, the ground-calculated
location is RA,Dec 166.409,-40.677 (J2000) with an uncertainty of 4 arcmin
(radius, including a systematic uncertainty, 90% containment).
The burst was 43 degrees off the BAT boresight (30% encoding).  It is
within 25 arcsec of the XRT position (Romano et al., GCN Circ 3036
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 ).

The burst lightcurve has two overlapping peaks, with a T90 duration
of ~23 sec.  The peak flux is 5.5 ph/cm2/sec for a 1-sec interval (15-350 keV).
The fluence is ~9.4e-6 erg/cm^2 (15-350 keV).