TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4425 SUBJECT: GRB 060102: Swift-BAT refined analysis DATE: 06/01/03 04:05:22 GMT FROM: Takanori Sakamoto at NASA/GSFC H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), M. Chester (PSU), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), C. Markwardt (GSFC/UMD), F. Marshall (GSFC), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC), on behalf of the Swift-BAT team: Using the data set from T-119.9 to T+248.2 sec from the recent telemetry downlink, we report further analysis of BAT GRB 060102 (trigger #175603) (Retter, et al., GCN 4423). The BAT ground-calculated position is (RA,Dec) = 328.834, -1.838 {21h 55m 20.3s, -1d 50' 17.8"} [deg; J2000] +- 2.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 89 %. The BAT light curve shows a single peak of about three seconds followed by the small bump at T+16 sec. T90 (15-350 keV) is (21 +- 2) sec (estimated error including systematics). The power law index of the time-averaged spectrum is 1.19 +- 0.38. The fluence in the 15-150 keV band is (2.4 +- 0.5) x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+0.72 sec in the 15-150 keV band is (0.4 +- 0.1) ph/cm2/sec. All the quoted errors are at the 90% confidence level. A data glitch caused the original GCN Notices to go out with the wrong burst trigger time (02:45:43 instead of 21:17:28 UT). This was not realized during the first circular (#4423), but was corrected in circular 4424.