TITLE: GCN CIRCULAR NUMBER: 23872 SUBJECT: GRB 190204A: Swift-BAT refined analysis DATE: 19/02/05 03:33:29 GMT FROM: Amy Lien at GSFC T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-234 to T+968 sec from the recent telemetry downlink, we report further analysis of BAT GRB 190204A (trigger #887579 and #887580) (Lien et al., GCN Circ. 23852). In this circular, we adopted the trigger time from the first trigger (#887579), 2019-02-04 05:46:01 UT, to be consistent with the T0 quoted in other circulars. The BAT ground-calculated position is RA, Dec = 351.491, 54.884 deg which is RA(J2000) = 23h 25m 57.8s Dec(J2000) = +54d 53' 02.4" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 48%. The mask-weighted light curve shows several overlapping pulses that starts at ~T-7 s and ends at ~T+55 s. The main peak occurs at ~T+5 s. T90 (15-350 keV) is 26.4 +- 7.5 sec (estimated error including systematics). The time-averaged spectrum from T-6.93 to T+53.82 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.30 +- 0.04. The fluence in the 15-150 keV band is 1.3 +- 0.03 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+4.55 sec in the 15-150 keV band is 30.5 +- 0.9 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/887580/BA/ (Please note that this page shows the automatic analysis from the 2nd trigger #887580, because BAT associated most of the data with this trigger ID. Thus, the T0 displayed in the webpage is 4.995 sec later than the trigger time referenced in this circular.)