TITLE: GCN CIRCULAR NUMBER: 14133 SUBJECT: GRB 130102A: Swift-BAT refined analysis DATE: 13/01/03 14:19:24 GMT FROM: Scott Barthelmy at NASA/GSFC C. B. Markwardt (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), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130102A (trigger #544784) (Page, et al., GCN Circ. 14127). The BAT ground-calculated position is RA, Dec = 311.435, 49.838 deg which is RA(J2000) = 20h 45m 44.4s Dec(J2000) = +49d 50' 16.4" with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 99%. The mask-weighted light curve shows a peak starting at ~T+10 sec, peaking at ~T+22 sec, and ending around T+180 sec. There is a possibility of emission out to at least T+230 sec. T90 (15-350 keV) is 77.5 +- 18.2 sec (estimated error including systematics). The time-averaged spectrum from T+12.51 to T+100.43 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.39 +- 0.18. The fluence in the 15-150 keV band is 7.2 +- 0.9 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+23.54 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. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/544784/BA/