TITLE: GCN CIRCULAR NUMBER: 23397 SUBJECT: GRB 181030A, Swift-BAT refined analysis DATE: 18/10/30 22:49:32 GMT FROM: Amy Lien at GSFC J. R. Cummings (CPI), S. D. Barthelmy (GSFC), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 181030A (trigger #869494) (Sonbas et al., GCN Circ. 23389). The BAT ground-calculated position is RA, Dec = 146.916, 14.657 deg which is RA(J2000) = 09h 47m 39.8s Dec(J2000) = +14d 39' 26.5" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 71%. The mask-weighted light curve shows a long pulse that starts at ~T0 and peaks at ~T+70 s. The main pulse emission ends at ~T+200 s, with some weak emission lasting till ~T+400 s. T90 (15-350 keV) is 304.7 +- 76.9 sec (estimated error including systematics). The time-averaged spectrum from T+3.2 to T+443.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.77 +- 0.09. The fluence in the 15-150 keV band is 6.2 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+71.33 sec in the 15-150 keV band is 0.8 +- 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/869494/BA/