TITLE: GCN CIRCULAR NUMBER: 24783 SUBJECT: GRB 190610A: Swift-BAT refined analysis DATE: 19/06/11 14:09:44 GMT FROM: Amy Lien at GSFC D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. A. Evans (U Leicester), H. A. Krimm (NSF), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), 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+35 sec from the recent telemetry downlink, we report further analysis of BAT GRB 190610A (trigger #907754) (Evans et al., GCN Circ. 24775). The BAT ground-calculated position is RA, Dec = 46.244, -7.661 deg which is RA(J2000) = 03h 04m 58.6s Dec(J2000) = -07d 39' 38.7" with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a short spike that starts ~T+0.2, peaks at ~T+0.3, and ends ~T+0.9. Due to the SAA, data beyond ~T+35 s are unavailable. T90 (15-350 keV) is 0.62 +- 0.11 sec (estimated error including systematics). The time-averaged spectrum from T+0.21 to T+0.89 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.32 +- 0.27. The fluence in the 15-150 keV band is 4.1 +- 0.5 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.05 sec in the 15-150 keV band is 3.9 +- 0.5 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/907754/BA/