TITLE: GCN CIRCULAR NUMBER: 22848 SUBJECT: GRB 180624A: Swift-BAT refined analysis DATE: 18/06/26 02:19:59 GMT FROM: Amy Lien at GSFC J. R. Cummings (CPI), S. D. Barthelmy (GSFC), S. L. Gibson (U Leicester), H. A. Krimm (NSF/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+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180624A (trigger #844192) (Gibson et al., GCN Circ. 22832). The BAT ground-calculated position is RA, Dec = 318.096, -2.356 deg which is RA(J2000) = 21h 12m 22.9s Dec(J2000) = -02d 21' 21.0" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 47%. The mask-weighted light curve shows a multi-peaked light curve that starts at ~T-60 s and ends at ~T+540 s. The largest peak occurs at ~T+7 s. The burst went out of the BAT FOV at ~T+720 s. T90 (15-350 keV) is 486.4 +- 38.5 sec (estimated error including systematics). The time-averaged spectrum from T-60.61 to T+541.80 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.91 +- 0.10. The fluence in the 15-150 keV band is 5.8 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+6.02 sec in the 15-150 keV band is 1.4 +- 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/844192/BA/