TITLE: GCN CIRCULAR NUMBER: 7235 SUBJECT: GRB 080129, Swift-BAT refined analysis DATE: 08/01/29 16:35:01 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), S. Immler (CRESST/GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080129 (trigger #301981) (Immler, et al., GCN Circ. 7226). The BAT ground-calculated position is RA, Dec = 105.297, -7.840 deg which is RA(J2000) = 07h 01m 11.2s Dec(J2000) = -7d 50' 24" with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 46%. The mask-weighted light curve shows a single broad peak starting at ~T-20 sec, peaking at ~T+20, and ending at ~T+50. T90 (15-350 keV) is 48 +- 10 sec (estimated error including systematics). The time-averaged spectrum from T-15.0 to T+49.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.34 +- 0.26. The fluence in the 15-150 keV band is 8.9 +- 1.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+24.50 sec in the 15-150 keV band is 0.2 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The majority of the indicators say this is a GRB, but at this time we can not rule out a galactic source explanation for this trigger. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/301981/BA/