TITLE: GCN CIRCULAR NUMBER: 5974 SUBJECT: GRB 061222B, Swift-BAT refined analysis DATE: 06/12/22 20:38:24 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), J. L. Racusin (PSU), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the data set from T-239.0 to T+903.1 sec from the recent telemetry downlink, we report further analysis of BAT GRB 061222 (trigger #252593) (Racusin, et al., GCN Circ. 5957). The BAT ground-calculated position is RA, Dec = 105.352, -25.865 deg which is RA(J2000) = 7h 1m 24.6s Dec(J2000) = -25d 51' 55.6" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 16%. The burst had a single gradual peak with several sub peaks. T90 (15-350 keV) is 40 +- 5 sec (estimated error including systematics). At this time, there is a gap in the downlinked data from T+480 sec to T+660 and T+720 to T+840 sec. A further Circular will be issued if burst activity is found in these intervals. The time-averaged spectrum from T+35.1 to T+84.3 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.98 +- 0.13. The fluence in the 15-150 keV band is 2.2 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+59.16 sec in the 15-150 keV band is 1.5 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level.