TITLE: GCN CIRCULAR NUMBER: 22628 SUBJECT: GRB 180410A: Swift-BAT refined analysis DATE: 18/04/10 21:03:41 GMT FROM: Amy Lien at GSFC A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), J. D. Gropp (PSU), H. A. Krimm (NSF/USRA), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180410A (trigger #824063) (Gropp et al., GCN Circ. 22620). The BAT ground-calculated position is RA, Dec = 95.974, 12.804 deg which is RA(J2000) = 06h 23m 53.7s Dec(J2000) = +12d 48' 15.2" with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 53%. The mask-weighted light curve shows a weak-long pulse that starts and peak at ~ T+25 s, and ends at ~T+150 s. T90 (15-350 keV) is 100.7 +- 13.8 sec (estimated error including systematics). The time-averaged spectrum from T+25.16 to T+153.67 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.46 +- 0.13. The fluence in the 15-150 keV band is 2.2 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+25.70 sec in the 15-150 keV band is 0.7 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The spectral and temporal behaviors are consistent with those of a GRB. However, due to the proximity to the Galactic plane (0.17 degrees), we cannot rule out the possibility that this is a Galactic transient. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/824063/BA/