TITLE: GCN CIRCULAR NUMBER: 6081 SUBJECT: GRB 070208, Swift-BAT refined analysis DATE: 07/02/08 17:03:48 GMT FROM: Scott Barthelmy at NASA/GSFC C. Markwardt (GSFC/UMD), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), 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-239 to T+552 sec from the recent telemetry downlink, we report further analysis of BAT GRB 070208 (trigger #259714) (Sato, et al., GCN Circ. 6074). The BAT ground-calculated position is RA, Dec = 197.896, 61.946 deg which is RA(J2000) = 13h 11m 35.0s Dec(J2000) = 61d 56' 44.3" with an uncertainty of 3.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%. The mask-weighted lightcurve shows two peaks. The first (at T_zero) is FRED-like with a duration of ~7 sec. The second starts at ~T+35 sec and ends at ~T+50 sec. T90 (15-350 keV) is 48 +- 2 sec (estimated error including systematics). The time-averaged spectrum from T-1.0 to T+47.8 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.96 +- 0.37. The fluence in the 15-150 keV band is 4.3 +- 1.0 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T-0.26 sec in the 15-150 keV band is 0.9 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. Fitting the two peaks separately with a simple power law model, -2 to 5 s: photon index = 2.17 -0.44 +0.53 25 to 50 s: photon index = 1.69 -0.34 +0.36 Given the widths of the two peaks and that the second peak is spectrally harder than the first, we conclude that this burst is a long GRB and is not a short hard burst with extended emission.