TITLE: GCN CIRCULAR NUMBER: 15836 SUBJECT: GRB 140213A: Swift-BAT refined analysis DATE: 14/02/14 21:59:51 GMT FROM: Hans Krimm at NASA-GSFC M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), S. T. Holland (STScI), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140213A (trigger #586569) (Holland, et al., GCN Circ. 15825). The BAT ground-calculated position is RA, Dec = 105.166, -73.136 deg which is RA(J2000) = 07h 00m 39.8s Dec(J2000) = -73d 08' 10.8" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%. The mask-weighted light curve begins at T-120 sec, when the source position came into the BAT field-of-view during a pre-planned slew. The emission begins faintly at ~T-25 sec, and rises sharply beginning at ~T-5.5 sec, peaks at T-4 sec and a stronger peak at ~T+1 sec, returning almost to baseline around T+10 sec. Then there is a second, much weaker and softer pulse at around T+15 sec, followed by an even weaker pulse at ~T+70 sec, with extended emission out to ~T+160 sec. The burst position left the FoV after another pre-planned slew at T+780 sec. T90 (15-350 keV) is 60.0 +- 2.6 sec (estimated error including systematics). The time-averaged spectrum from -5.7 to +82.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.80 +- 0.04. The fluence in the 15-150 keV band is 1.2 +- 0.0 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+0.56 sec in the 15-150 keV band is 23.5 +- 0.8 ph/cm2/sec. 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/586569/BA/