TITLE: GCN CIRCULAR NUMBER: 7317 SUBJECT: GRB 080218A, Swift-BAT refined analysis DATE: 08/02/19 03:24:29 GMT FROM: Takanori Sakamoto at NASA/GSFC E. Fenimore (LANL), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU), H. Ziaeepour (UCL-MSSL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+303 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080218A (trigger #303609) (Ziaeepour, et al., GCN Circ. 7313). The BAT ground-calculated position is RA, Dec = 355.941, 12.159 deg which is RA(J2000) = 23h 43m 45.8s Dec(J2000) = 12d 9' 34" with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 21%. The mask-weighted light curve shows three peaks at T-12 sec, T+0 sec, and T+9 sec. T90 (15-350 keV) is 27.6 +- 5.9 sec (estimated error including systematics). The time-averaged spectrum from T-12.8 to T+18.6 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.34 +- 0.35. The fluence in the 15-150 keV band is 6.3 +- 1.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+1.22 sec in the 15-150 keV band is 1.4 +- 0.4 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/303609/BA/