TITLE: GCN CIRCULAR NUMBER: 23625 SUBJECT: GRB 190106A: Swift-BAT refined analysis DATE: 19/01/06 21:07:30 GMT FROM: Scott Barthelmy at NASA/GSFC D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), E. Sonbas (Adiyaman Univ.), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-240 to T+695 sec from recent telemetry downlinks, we report further analysis of BAT GRB 190106A (trigger #882252) (Sonbas, et al., GCN Circ. 23615). The BAT ground-calculated position is RA, Dec = 29.877, 23.839 deg, which is RA(J2000) = 01h 59m 30.6s Dec(J2000) = +23d 50' 20.8" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 65%. The mask-weighted light curve shows it started at ~T-10sec, with a pair of overlapping FRED-like peaks at ~T+2 and ~T+10 sec, then a long decay and two more peaks at ~T+57 and ~T+76 sec, and returning to baseline at ~T+125 sec. T90 (15-350 keV) is 76.8 +- 2.4 sec (estimated error including systematics). The time-averaged spectrum from T-0.17 to T+99.72 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.34 +- 0.21, and Epeak of 120 +- 83 keV (chi squared 37.25 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 6.0 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+75.28 sec in the 15-150 keV band is 5.5 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.64 +- 0.05 (chi squared 43.44 for 57 d.o.f.). 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/882252/BA/