TITLE: GCN CIRCULAR NUMBER: 6326 SUBJECT: GRB 070419A Swift-BAT Refined Analysis DATE: 07/04/20 01:10:41 GMT FROM: Michael Stamatikos at GSFC M. Stamatikos (GSFC/ORAU), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 070419A (trigger #276205) (Stamatikos, et al., GCN Circ. 6302). The BAT ground-calculated position is RA, Dec = 182.755, 39.903 deg which is RA(J2000) = 12h 11m 1.1s Dec(J2000) = 39d 54' 11.0" with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The coding fraction was 1. This position is ~1.5 arcmin from the position of the optical afterglow candidate reported by Chornock et al. (GCN Circ 6304), which was further confirmed by Cenko et al. (GCN Circ 6306). The mask-weighted light curve has a nearly symmetric, smooth profile, although a tail of emission extends to about T+160 sec. The T90 (15-350 keV) is ~116 +- 6 sec (estimated error including systematics). The time-averaged spectrum, from T-35 to T+93, is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.35 +- 0.25. The fluence in the 15-150 keV band is 5.6 +- 0.8 x 10^-7 erg/cm^2. The 1-sec peak photon flux measured from T-1.12 sec in the 15-150 keV band is 2.8 x 10^-2 ph/cm^2/sec. All the quoted errors are at the 90% confidence level. Under a Lambda Cold Dark Matter cosmological model, with Ho ~ 65 km/Mpc/s, Omega_M ~ 0.30, and Omega_Lambda ~ 0.70, the preliminary Keck absorption redshift of 0.97, reported by Cenko et al. (GCN Circ 6322), when coupled to the BAT fluence reported above, results in a preliminary isotropic energy emission estimate of ~ 1.60 x 10^+51 ergs in the 15-150 keV observed (30-296 keV GRB rest frame) band pass.