TITLE: GCN CIRCULAR NUMBER: 13137 SUBJECT: GRB 120327A: Swift-BAT refined analysis DATE: 12/03/27 12:22:18 GMT FROM: Scott Barthelmy at NASA/GSFC H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), B. Sbarufatti (INAF-OAB/PSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 120327A (trigger #518731) (Sbarufatti, et al., GCN Circ. 12123). The BAT ground-calculated position is RA, Dec = 246.854, -29.415 deg, which is RA(J2000) = 16h 27m 25.0s Dec(J2000) = -29d 24' 55.5" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 76%. The mask-weighted light curve shows 3 main peaks (two weak peaks, then the main peak). The first starts at ~T-25 sec, peaks at ~T+2 sec; and the second peaks at ~T+18 sec. The main peak starts at ~T+30 sec, peaks at ~T+37 sec, and returns to baseline at ~T+180 sec. T90 (15-350 keV) is 62.9 +- 7.5 sec (estimated error including systematics). The time-averaged spectrum from T-15.79 to T+74.58 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.52 +- 0.06. The fluence in the 15-150 keV band is 3.6 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+37.09 sec in the 15-150 keV band is 3.9 +- 0.2 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/518731/BA/