TITLE: GCN CIRCULAR NUMBER: 24941 SUBJECT: GRB 190630C: Swift-BAT refined analysis DATE: 19/07/01 14:58:51 GMT FROM: Hans Krimm at NSF/NASA-GSFC H. A. Krimm (NSF), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 190630C (trigger #912239) (Ukwatta, et al., GCN Circ. 24927). The BAT ground-calculated position is RA, Dec = 293.890, -32.759 deg which is RA(J2000) = 19h 35m 33.6s Dec(J2000) = -32d 45' 32.5" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 57%. The mask-weighted light curve shows a single FRED-shaped burst, beginning at ~T-5 sec, peaking at T+0 sec, and declining to background by ~T+40 sec. A spacecraft slew took the burst position out of the BAT field of view just before T+500 sec. T90 (15-350 keV) is 38.4 +- 9.3 sec (estimated error including systematics). The time-averaged spectrum from T-1.92 to T+50.23 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.96 +- 0.11. The fluence in the 15-150 keV band is 2.3 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.12 sec in the 15-150 keV band is 2.0 +- 0.3 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/912239/BA/