GRBlog: GRB041220A

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GRB 041220A

Burst Time	22:58:26	GCN2890
RA	19:25:08.64	GCN2890
DEC	+60:37:26.40	GCN2890
Radius	12.00'	GCN2890
Fluence (15-350 keV)	1e-06 erg cm-2	GCN2890
Duration (15-350 keV)	2 s	GCN2890

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<-- GCN 2889 | GCN 2891 -->

GRB 041220: Swift-BAT burst	Krimm et al.
	GCN 2890

SOURCE: GCN
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 2890
SUBJECT: GRB 041220: Swift-BAT burst
DATE: 04/12/21 02:48:49 GMT
FROM: Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>

H. Krimm (GSFC/USRA), L. Angelini (GSFC/JHU), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC), E. Fenimore (LANL), N. Gehrels (GSFC), M. Goad (U.Leicester), D. Hullinger (GSFC/UMD), C. Markwardt (GSFC/UMD), K. McLean (LANL/UTD), D. Palmer (LANL), A. Parsons (GSFC), P. Roming (PSU), G. Sato (ISAS), M. Suzuki (Saitama), T. Takashima (ISAS), and J. Tueller (GSFC) on behalf of the Swift BAT team:

At 22:58:26 UT, the Swift-BAT triggered and located on-board GRB 041220 (BAT Trigger #100433). The spacecraft did not autonomously slew to the burst since automated slewing is not yet enabled. Automated notification to the BAT Team through TDRSS was partially enabled for this burst.

The ground-calculated location is RA 291.286, DEC +60.624 (J2000) with an uncertainty of 12 arcmin (radius, dominated by a large systematic uncertainty due to the lack of an on-orbit boresight alignment calibration). This is ~16 degrees off the BAT boresight. It was imaged at >22 sigma. The source is 19 degrees off the galactic plane.

The burst is a fast-rise exponential-decay (FRED) with a full-width at half-max of ~2 sec. There is some indication of emission out to 18 sec after the peak. The peak flux was 2.2 events/cm^2/sec in the 15-350 keV band (~8 Crab). The total fluence is approximately 5.9 events/cm^2 (15-350 keV), or 1E-6 erg/cm^2.

...

GRB Position Observations

GRB_ID	RA	ERA	DEC	EDEC	CORNER
20041220A	291.286	0.2	+60.624	0.2	no

GRB Observations

GRB_ID	OBSDATE (UT)	DURATION	FLUENCE (erg cm-2)	PEAK_FLUX (erg cm-2 s-1)	EPEAK (keV)	MIN_KEV	MAX_KEV	UPLIM
20041220A	2004 Dec 21 22:58:26	2 sec	1E-6			15	350	no

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