TITLE: GCN CIRCULAR NUMBER: 10434 SUBJECT: GRB 100219A: Swift-BAT refined analysis DATE: 10/02/19 21:13:35 GMT FROM: Scott Barthelmy at NASA/GSFC W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. Rowlinson (U Leicester), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (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 100219A (trigger #412982) (Rowlinson, et al., GCN Circ. 10430). The BAT ground-calculated position is RA, Dec = 154.202, -12.555 deg which is RA(J2000) = 10h 16m 48.4s Dec(J2000) = -12d 33' 19.4" with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 71%. The mask-weighted light curve shows a roughly triangular shaped peak starting at ~T-10sec, peaking at ~T+30 sec, and ending at ~T+50 sec (possibly out to ~T+100 sec). T90 (15-350 keV) is 18.8 +- 5.0 sec (estimated error including systematics). The time-averaged spectrum from T+19 to T+45 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.34 +- 0.25. The fluence in the 15-150 keV band is 3.7 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+31.89 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/412982/BA/