TITLE: GCN CIRCULAR NUMBER: 12086 SUBJECT: Swift J185003.2-005627: Swift-BAT refined analysis DATE: 11/06/25 12:34:42 GMT FROM: Scott Barthelmy at NASA/GSFC C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), 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-240 to T+302 sec from recent telemetry downlinks, we report further analysis of Swift J185003.2-005627 (trigger #456014) (Beardmore, et al., GCN Circ. 12083). The BAT ground-calculated position is RA, Dec = 282.509, -0.946 deg which is RA(J2000) = 18h 50m 02.2s Dec(J2000) = -00d 56' 47.3" with an uncertainty of 3.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 41%. The mask-weighted light curve shows a single pulse starting at ~T-2 sec, peaking at ~T+4 sec, and ending at ~T+14 sec, entirely in the lowest energy band (15-25 keV). T90 (15-350 keV) is 12.0 +- 4.5 sec (estimated error including systematics). The time-averaged spectrum from T-1.7 to T+13.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 5.11 +- 0.98. The fluence in the 15-150 keV band is 1.6 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+1.28 sec in the 15-150 keV band is 0.6 +- 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/456014/BA/