TITLE: GCN CIRCULAR NUMBER: 13246 SUBJECT: GRB 120422A: Swift-BAT refined analysis DATE: 12/04/22 13:48:29 GMT FROM: Scott Barthelmy 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), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), E. Troja (NASA/GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-61 to T+224 sec from recent telemetry downlinks, we report further analysis of BAT GRB 120422A (trigger #520658) (Troja, et al., GCN Circ. 13243). The BAT ground-calculated position is RA, Dec = 136.915, 13.974 deg, which is RA(J2000) = 09h 07m 39.7s Dec(J2000) = +13d 58' 27.1" with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 68%. The mask-weighted light curve shows a single peak starting at ~T-3 sec, peaking at ~T+1, and ending at ~T+20 sec. There is a low-significance peak (~3 sigma) at T+45 to T+65. T90 (15-350 keV) is 5.35 +- 1.4 sec (estimated error including systematics). The time-averaged spectrum from T-0.80 to T+6.00 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.19 +- 0.24. The fluence in the 15-150 keV band is 2.3 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.86 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. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/520658/BA/