TITLE: GCN CIRCULAR NUMBER: 10417 SUBJECT: GRB 100213B: Swift-BAT refined analysis DATE: 10/02/14 05:56:33 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU), L. Vetere (PSU) (i.e. the Swift-BAT team): Using the data set from T-61 to T+242 sec from recent telemetry downlinks, we report further analysis of BAT GRB 100213B (trigger #412220) (Vetere, et al., GCN Circ. 10412). The BAT ground-calculated position is RA, Dec = 124.320, 43.464 deg which is RA(J2000) = 08h 17m 16.8s Dec(J2000) = +43d 27' 51.7" with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 56%. The mask-weighted light curve shows a FRED-like pulse starting at ~T-5 sec, peaking at ~T+5 sec, and ending at ~T+150 sec. Because the burst goes out of the BAT FOV at T+250 sec (due to an observing constraint), we can not tell if there if any detectable activity past T+250 sec. T90 (15-350 keV) is 48.0 +- 16.0 sec (estimated error including systematics). The time-averaged spectrum from T-12.7 to T+35.3 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.13 +- 0.61, and Epeak of 39.1 +- 8.8 keV (chi squared 58.8 for 56 d.o.f.). The 1-sec peak flux measured from T+10.76 sec in the 15-150 keV band is 0.5 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.04 +- 0.13 (chi squared 67.0 for 57 d.o.f.). All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/412220/BA/