TITLE: GCN CIRCULAR NUMBER: 14232 SUBJECT: GRB 130216B BAT refined analysis DATE: 13/02/17 19:42:32 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-0 to T+10 sec, we report further analysis of BAT GRB 130216B (trigger #548918) (Cummings, GCN Circ. 14226). The BAT ground- calculated position is RA, Dec 58.866, +2.036, which is: RA (J2000) 03h 55m 27.9s Dec (J2000) 02d 02m 10s with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 11%. The mask-weighted light curve shows two peaks, the smaller from T+0 to T+2 and the larger from T+2 to T+4. Each is symmetrical in time. T90 (15-350 keV) is 3.7 +- 0.5 sec (estimated error including systematics). The time-averaged spectrum from T+0 to T+4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.77 +- 0.08. The fluence in the 15-150 keV band is 1.3 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.5 sec in the 15-150 keV band is 7.4 +- 0.6 ph/cm2/sec. All the quoted errors are at the 90% confidence level. Because this burst was not located in onboard processing, the full burst response was not initiated and not all of the normal data products are available. A Swift TOO to determine the position of the x-ray afterglow has been approved, and will take place once the source comes out of constraint on February 19th.