TITLE: GCN CIRCULAR NUMBER: 16438 SUBJECT: GRB 140622A: An unusual short event, Swift-BAT refined analysis DATE: 14/06/22 21:32:14 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift T. Sakamoto (AGU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-61 to T+302 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140622A (trigger #602278) (D'Elia, et al., GCN Circ. 16433). The BAT ground-calculated position is RA, Dec = 317.153, -14.412 deg which is RA(J2000) = 21h 08m 36.7s Dec(J2000) = -14d 24' 44.6" with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 57%. The mask-weighted light curve shows a single FRED peak. T90 (15-350 keV) is 0.13 +- 0.04 sec (estimated error including systematics). The time-averaged spectrum from T-0.02 to T+0.13 sec is best fit (chisqr = 0.63) by a black body spectrum with kT = 11.6 ± 1.8 keV. A simple power-law model is a relatively poor fit (chisqr 1.13), with a photon index of 3.08 ± 0.29. A power-law with an exponential cutoff at 44 ± 8 keV nominally fits the data almost as well (chisqr = 0.64) as the black body fit, but the power-law index below the cutoff energy and the normalization are poorly defined. The fluence in the 15-150 keV band using the black body spectrum is (2.7 ± 0.5) x 10^-08 erg/cm2. The 1-sec peak photon flux measured from T-0.45 sec in the 15-150 keV band is 0.6 ± 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. From the BAT spectrum, this event does not appear to be a short hard burst. The quickly fading X-ray lightcurve, however (to be reported in a later circular), does appear consistent with a SHB, and does not appear to be similar to the lightcurves of SGRs or other Galactic sources. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/602278/BA/