TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4961 SUBJECT: GRB 060413: Refined analysis of the Swift-BAT burst DATE: 06/04/14 00:48:30 GMT FROM: Louis M Barbier at NASA/GSFC/Swift L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), C. Pagani (PSU), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the data set from T-239 to T+510 sec from recent telemetry downlinks, we report further analysis of BAT GRB 060413 (trigger #205096) (Pagani, et al., GCN 4957). The BAT ground-calculated position is RA,Dec = 291.288,+13.746 deg {19h 25m 9.2s,+13d 44' 45.5"} (J2000) +- 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted lightcurve shows a slow rise starting at ~T+20 to a cusp-like double peak, then followed by a slow decay ending at ~T+220 sec. T90 (15-350 keV) is 150 +- 10 sec (estimated error including systematics). The time-averaged spectrum from T+29.6 to T+257.1 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.67 +- 0.08. The fluence in the 15-150 keV band is 3.6 +- 0.1 x 10-06 erg/cm2. The 1-sec peak photon flux measured from T+90.16 sec in the 15-150 keV band is 0.9 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.