TITLE: GCN CIRCULAR NUMBER: 10788 SUBJECT: GRB 100522A, Swift-BAT refined analysis DATE: 10/05/22 13:31:13 GMT FROM: Hans Krimm at NASA-GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), E. Troja (NASA/GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100522A (trigger #422783) (Troja, et al., GCN Circ. 10784). The BAT ground-calculated position is RA, Dec = 6.990, +9.397 deg which is RA(J2000) = 00h 27m 57.6s Dec(J2000) = +09d 23' 50.1" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 71%. The mask-weighted light curve shows a complex structure. There are two main episodes of emission, starting at T-0.5 sec and T+25 sec, respectively. The first episode starts with a broad multi-peaked structure 2.5 sec long followed by three short (~0.3 sec long) peaks. Then the emission returns to background levels before rising in a second, less intense and softer two peak structure approximately 15 sec long. T90 (15-350 keV) is 35.3 +- 1.8 sec (estimated error including systematics). The time-averaged spectrum from T-0.5 to T+40.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.89 +- 0.08. The fluence in the 15-150 keV band is 2.1 +- 0.1 x 10-6 erg/cm2. The 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV band is 7.1 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/422783/BA/