TITLE: GCN CIRCULAR NUMBER: 6212 SUBJECT: GRB 070318, Swift-BAT refined analysis DATE: 07/03/18 13:59:03 GMT FROM: Scott Barthelmy at NASA/GSFC J. Cummings (GSFC/UMBC), L. Barbier (GSFC), S. D. Barthelmy (GSFC), 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), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the data set from T-120 to T+302 sec from recent telemetry downlinks, we report further analysis of BAT GRB 070318 (trigger #271019) (Cummings, et al., GCN Circ. 6210). The BAT ground-calculated position is RA, Dec = 48.486, -42.950 deg which is RA(J2000) = 03h 13m 56.6s Dec(J2000) = -42d 57' 1.1" with an uncertainty of 0.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 80%. The mask-weighted lightcurve is a single FRED peak starting at ~T-10sec, peaking at ~T+2 sec, and returning to background at around T+120 sec. There is the possibility of weak peaks at ~T+140 and T+170 sec at the ~3-sigma level. T90 (15-350 keV) is 63 +- 3 sec (estimated error including systematics). The time-averaged spectrum from T-1.0 to T+89.4 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.44 +- 0.08. The fluence in the 15-150 keV band is 2.3 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+1.94 sec in the 15-150 keV band is 1.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.