TITLE: GCN CIRCULAR NUMBER: 6290 SUBJECT: GRB 070412, Swift-BAT refined analysis DATE: 07/04/12 13:39:26 GMT FROM: Hans Krimm at NASA-GSFC T. Sakamoto (GSFC/ORAU), 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), P. Romano (Univ. Bicocca & INAF-OAB), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the data set from T-239.3 to T+962.8 sec from the recent telemetry downlink, we report further analysis of BAT GRB 070412 (trigger #275119) (Romano, et al., GCN Circ. 6273). The BAT ground-calculated position is RA, Dec = 181.525, 40.133 deg which is RA(J2000) = 12h 06m 6.1s Dec(J2000) = 40d 07' 57.0" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 98%. The mask-weighted light curve shows a double-peaked structure with the first peak from approximately T-4 sec to T+10 sec and a second 2-sec long peak at T+30 sec. T90 (15-350 keV) is 34 +- 2 sec (estimated error including systematics). The spacecraft slewed away from the burst location at T+122 sec, although the burst remained in the partially coded field of view until T+716 sec, when the spacecraft slewed away again. The time-averaged spectrum from T-4.1 to T+31.2 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.45 +- 0.20. The fluence in the 15-150 keV band is 4.8 +- 0.7 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+5.32 sec in the 15-150 keV band is 0.7 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.