TITLE: GCN CIRCULAR NUMBER: 19494 SUBJECT: GRB 160601A: Swift-BAT refined analysis DATE: 16/06/02 17:50:25 GMT FROM: Tilan Ukwatta at LANL J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), N. Gehrels (GSFC), D. Kocevski (NASA/GSFC/ORAU), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-240 to T+500 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160601A (trigger #688452) (Kocevski, et al., GCN Circ. 19478). The BAT ground-calculated position is RA, Dec = 234.923, 64.532 deg which is RA(J2000) = 15h 39m 41.6s Dec(J2000) = +64d 31' 53.5" with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 66%. The mask-weighted light curve shows a single pluse starting ~T-0.1 sec, and ending around ~T+0.15 sec. T90 (15-350 keV) is 0.12 +- 0.02 sec (estimated error including systematics). The time-averaged spectrum from T-0.02 to T+0.12 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.04 +- 0.24. The fluence in the 15-150 keV band is 6.6 +- 1.1 x 10^-08 erg/cm2. The 1-sec peak photon flux measured from T-0.45 sec in the 15-150 keV band is 0.9 +- 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/688452/BA/