TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4075 SUBJECT: GRB051008: Refined analysis of the Swift-BAT burst DATE: 05/10/09 01:54:18 GMT FROM: Scott Barthelmy at NASA/GSFC A. Parsons (GSFC), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), T. McMahon (Langston U.), D. Palmer (LANL), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC), N. White (GSFC) on behalf of the Swift-BAT team: Using a partial data set from recent telemetry downlinks, we report further analysis of Swift-BAT Trigger #158855 (Marshall, et al., GCN 4069). So far all we have is data from T-300 to T+32 sec. The ground-analysis position is RA,Dec 202.851,+42.101 {13h 31m 24.2s,+42d 6' 4.4"} (J2000) with an uncertainty of 0.8 arcmin (radius, 90%, stat+sys). The lightcurve has two overlapping peaks whose emission starts at T-25. There are is a small peak at T+18. The emission continues beyond T+32 sec. When we get the full data set, we will report the standard T90, fluence, and peak flux values for this burst.