TITLE: GCN CIRCULAR NUMBER: 5964 SUBJECT: GRB 061222A, Swift-BAT refined analysis DATE: 06/12/22 06:36:47 GMT FROM: Scott Barthelmy at NASA/GSFC GRB 061222A, Swift-BAT refined analysis J. Tueller (GSFC), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), T. Ukwatta (UMD) on behalf of the Swift-BAT team: Using the data set from T-240 to T+302 sec from the recent telemetry downlink, we report further analysis of BAT GRB 061222A (trigger #252588) (Grupe, et al., GCN Circ. 5954). The BAT ground-calculated position is RA, Dec = 358.258, 46.527 deg which is RA(J2000) = 23h 53m 1.9s Dec(J2000) = 46d 31' 37.3" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 70%. The mask-weighted lightcurve shows the emision starting at T-100 sec with a small peak at T_zero, and then a 10-sec FRED peak starting at T+25 sec. It is followed by two 10-sec peaks at T+50 and T+65 sec; then a large peak at T+88 sec with a FWHM of ~12 sec and the emission returns to background at T+115 sec. T90 (15-350 keV) is 72 +- 3 sec (estimated error including systematics). At this time, there is a gap in the downlinked data from T-180 sec to T-110. A further Circular will be issued if there is burst activity in this interval. The time-averaged spectrum from T-2.5 to T+117.7 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.39 +- 0.04. The fluence in the 15-150 keV band is 8.3 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+86.54 sec in the 15-150 keV band is 9.2 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.