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NASA Swift: GRB 060522: Swift-BAT Refined Analysis

Status Report From: Goddard Space Flight Center
Posted: Wednesday, May 24, 2006

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TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 5153
SUBJECT: GRB 060522: Swift-BAT Refined Analysis
DATE: 06/05/22 13:25:26 GMT
FROM: Hans Krimm at NASA-GSFC krimm@milkyway.gsfc.nasa.gov

H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/JSPS/USRA), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), on behalf of the Swift-BAT team:

Using the data set from T-239.0 to T+730.1 sec from the recent telemetry downlink, we report further analysis of BAT GRB 060522 (trigger #211117) (Fox, et al., GCN 5150). The BAT ground-calculated position is (RA,Dec) = 322.953, 2.889 deg {21h 31m 48.8s, 2d 53' 18.9"} (J2000) +- 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 75%.

The mask-weighted light curve shows two broad peaks, the first with a FRED-like profile from T+0 to T+20 sec and the second with a square profile from T+25 to T+80 sec. Nearly all emission is below 100 keV. T90 (15-350 keV) is 69 +- 5 sec (estimated error including systematics).

The time-averaged spectrum from T+0.2 to T+76.9 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.59 +- 0.15. The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+4.41 sec in the 15-150 keV band is 0.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.

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