TITLE: GCN CIRCULAR NUMBER: 7272 SUBJECT: GRB 080207, Swift-BAT refined analysis DATE: 08/02/08 15:19:29 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), D. Palmer (LANL), J. L. Racusin (PSU), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080207 (trigger #302728) (Racusin, et al., GCN Circ. 7264). The BAT ground-calculated position is RA, Dec = 207.514, 7.492 deg which is RA(J2000) = 13h 50m 3.3s Dec(J2000) = 7d 29' 32" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a long smooth rise starting at ~T-20 sec, peaking around T+100 sec, then dropping to a minimum around T+200 sec, then rising again out to T+320 sec at which point the location went out of the BAT FOV when the spacecraft slewed to a new target. T90 (15-350 keV) is >300 sec (estimated error including systematics). The time-averaged spectrum from T+4.7 to T+332.9 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.17 +- 0.27, and Epeak of 107.8 +- 72.5 keV (chi squared 51.31 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 6.1 +- 0.2 x 10^-06 erg/cm2 and the 1-sec peak flux measured from T+330.34 sec in the 15-150 keV band is 1.0 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.58 +- 0.06 (chi squared 57.73 for 57 d.o.f.). All the quoted errors are at the 90% confidence level. The BAT characteristics of this burst, particularly the long smooth lightcurve, suggest that it might be at high redshift, but the high absorption of the XRT spectrum (Racusin et al. GCN 7266) make it unlikely. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/302728/BA/