TITLE: GCN CIRCULAR NUMBER: 16161 SUBJECT: GRB 140423A: Swift-BAT refined analysis DATE: 14/04/24 04:43:09 GMT FROM: Tilan Ukwatta at MSU J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), E. Sonbas (NASA/GSFC/Adiyaman Univ.), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (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 140423A (trigger #596901) (Sonbas, et al., GCN Circ. 16142). The BAT ground-calculated position is RA, Dec = 197.276, 49.838 deg which is RA(J2000) = 13h 09m 06.2s Dec(J2000) = +49d 50' 18.3" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 39%. The mask-weighted light curve shows a multi-peak episode starting ~T-50 sec, highest peak at ~T+45 sec, and the episode ends around ~T+140 sec. T90 (15-350 keV) is 134 +- 23 sec (estimated error including systematics). The time-averaged spectrum from T-130.13 to T+108.91 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.33 +- 0.06. The fluence in the 15-150 keV band is 9.4 +- 0.3 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+44.19 sec in the 15-150 keV band is 2.1 +- 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/596901/BA/