TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4757 SUBJECT: GRB 060211A: Further refined analysis of the Swift burst DATE: 06/02/13 18:39:23 GMT FROM: Hans Krimm at NASA-GSFC H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD), C. Hurkett (U Leicester), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (ISAS), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the data set from T-300 to T+303 sec from a recent telemetry downlink, we report further analysis of the results from BAT GRB 060211A (trigger #181126) (Hurkett, et al., GCN 4736, Sato, et all, GCN 4751). The BAT ground-calculated position is RA,Dec = 58.380, 21.489 deg {3h 53m 31.1s, 21d 29' 20.0"} (J2000) +- 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted lightcurve shows that this was a very long burst. There was a weak, soft precursor starting at T-180 secs and lasting, in the lowest energy band, until T-90 secs. There is another episode of weak emission from T-10 to T+50, and then two prominent peaks from T+50 to T+100 and from T+130 to T+180 secs. The first of the main peaks is harder than the second. There is no significant emission beyond T+190 secs. T90 (15-350 keV) is (126 +- 5) sec (estimated error including systematics). The time-averaged spectrum from T+47.8 to T+191.0 is best fit by a power law with an exponential cutoff. This fit gives a photon index of 0.85 +- 0.53, and Epeak of 58.3 +- 13.2 keV (chi squared 59 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is (1.5 +- 0.1) x 10^-06 erg/cm2 and the 1-sec peak flux measured from T+145.58 sec in the 15-150 keV band is (0.4 +- 0.1) ph/cm2/sec. A fit to a simple power law gives a photon index of 1.76 +- 0.11 (chi squared 70 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.