TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5141 SUBJECT: GRB 060515 BAT refined analysis DATE: 06/05/15 17:24:44 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift E. Fenimore (LANL), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/JSPS/USRA), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), on behalf of the Swift-BAT team: Using the data set from T-239 to T+360 sec from recent telemetry downlinks, we report further analysis of BAT GRB 060515 (trigger #210084) (Cummings, et al., GCN 5132). The BAT ground- calculated position is (RA,Dec) = 127.295, 73.562 deg {8h 29m 10.7s, 73d 33' 43.2"} (J2000) +- 1.5 arcmin, (radius, sys+stat, 90% containment). This position is 0.7 arcmin from the onboard-calculated position and 0.3 arcmin from the XRT refined position (Page et al. GCN 5139). The partial coding was 38%. The light curve shows a single weak, long FRED peak. T90 (15-350 keV) is 52 +- 8 sec (estimated error including systematics). There is no indication of emission in the BAT energy band after T+70. As noted earlier, Swift did not slew to the burst because of an Earth limb constraint. At T+140 sec, Swift executed a preplanned slew away from the burst, which was then in the extreme partially coded field of view, so constraints on emission are poor. After T+360, Swift entered the SAA and we have no further information on any possible extended emission. The time-averaged spectrum from T+0.2 to T+57.5 is best fit by a simple power-law model. The power-law index of the time-averaged spectrum is 1.15 +- 0.15. The fluence in the 15-150 keV band is 1.4 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+5.58 sec in the 15-150 keV band is 0.8 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.