TITLE: GCN CIRCULAR NUMBER: 8649 SUBJECT: GRB 081210: Swift-BAT refined analysis DATE: 08/12/10 23:52:21 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+651 sec from recent telemetry downlinks, we report further analysis of BAT GRB 081210 (trigger #337073) (Krimm, et al., GCN Circ. 8648). The BAT ground-calculated position is RA, Dec = 70.485, -11.263 deg, which is RA(J2000) = 04h 41m 56.5s Dec(J2000) = -11d 15' 46.0" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 96%. The mask-weighted light curve shows several peaks. The first starts at ~T-30 sec. The second and brightest peaks at ~T+18 sec. The third peaks at T+135 sec. There is possible forth peak at T+180 sec. T90 (15-350 keV) is 146 +- 8 sec (estimated error including systematics). The time-averaged spectrum from T-12.9 to T+143.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.42 +- 0.14. The fluence in the 15-150 keV band is 1.8 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+17.97 sec in the 15-150 keV band is 2.5 +- 0.2 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/337073/BA/