TITLE: GCN CIRCULAR NUMBER: 7483 SUBJECT: GRB 080319C, Swift-BAT refined analysis DATE: 08/03/20 13:57:13 GMT FROM: Scott Barthelmy at NASA/GSFC M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), C. Pagani (PSU), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-120 to T+88 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080319C (trigger #306778) (Pagani, et al., GCN Circ. 7442). The BAT ground-calculated position is RA, Dec = 259.006, 55.393 deg which is RA(J2000) = 17h 16m 01.4s Dec(J2000) = +55d 23' 33.0" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 30%. For the limited event-by-event data we have received on this burst, the mask-weighted light curve shows 2 (possibly 3) overlapping FRED-like peaks starting at T-0.5 sec, peaking at T+0.2 sec, and ending at ~T+50 sec. The event-by-event data for this m-w lightcurve ends at T+88 sec. The on-board raw countrate lightcurve shows no activity after the T+88 sec limit of the event data, but the sensitivity is significantly less for this data product. T90 (15-350 keV) is 34 +- 9 sec (estimated error including systematics). The time-averaged spectrum from T-0.3 to T+51.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.37 +- 0.07. The fluence in the 15-150 keV band is 3.6 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.13 sec in the 15-150 keV band is 5.2 +- 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/306778/BA/ If we receive any more data on this burst and it shows any on-going activity beyond the current data limit of T+88 sec, then we will issue a revised circular.