TITLE: GCN CIRCULAR NUMBER: 12068 SUBJECT: GRB 110610A: Swift-BAT refined analysis DATE: 11/06/10 19:57:20 GMT FROM: Scott Barthelmy at NASA/GSFC 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), C. B. Markwardt (GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), 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-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 110610A (trigger #455155) (Marshall, et al., GCN Circ. 12065). The BAT ground-calculated position is RA, Dec = 308.205, 74.827 deg, which is RA(J2000) = 20h 32m 49.1s Dec(J2000) = +74d 49' 37.3" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 71%. The mask-weighted light curve shows several overlapping peaks starting at ~T-15 sec, with the first peak at ~T+3 sec, the highest peak at ~T+35 sec, and ending at ~T+55 sec. Emission may continue (~1-sigma level) out to T+170 sec. T90 (15-350 keV) is 46.4 +- 5.7 sec (estimated error including systematics). The time-averaged spectrum from T-11.1 to T+58.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.51 +- 0.05. The fluence in the 15-150 keV band is 4.9 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+34.42 sec in the 15-150 keV band is 4.2 +- 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/455155/BA/