TITLE: GCN CIRCULAR NUMBER: 22959 SUBJECT: GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data DATE: 18/07/18 23:38:33 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin and K. Hurley, on behalf of the IPN, A. Y. Lien, D. Palmer, S. Barthelmy, J. Cummings, and H. Krimm, on behalf of the Swift-BAT team, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, and A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report: The short-duration GRB 180718A was detected by Fermi (GBM; trigger 553571869), INTEGRAL (SPI-ACS), and Swift (BAT), at about 7065 s UT (01:57:45). We have triangulated this GRB to a GBM-INTEGRAL annulus centered at RA(2000)=260.736 deg (17h22m57s) Dec(2000)=+48.285 deg (+48d17'07"), whose radius is 79.182 +/- 2.067 deg (3 sigma). From the ground analysis using the available Swift/BAT event data from T-1 to T+2 sec, we found a 6.3 sigma detection in an image with intervals from T0-0.026 s to T0+0.165 s and energy range 15-150 keV, where T0 = 2018-07-18 01:57:44.530 UTC. The BAT ground-calculated position of this detection is RA, Dec = 336.019, 2.790 deg which is RA(J2000) = 22h 24m 04.6s Dec(J2000) = +02d 47' 23.3" with an uncertainty of 3.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 25%. The position is consistent with the annulus. The BAT mask-weighted light curve shows a single-pulse structure that starts at ~T0 and ends at ~T+0.1 s. T90 (15-350 keV) is 0.08 +- 0.02 sec (estimated error including systematics). Due to the weakness of this burst, the BAT spectrum is not well-constrained. However, the burst seems to be relatively soft comparing to regular short GRBs. The results of the batgrbproduct analysis are available at https://gcn.gsfc.nasa.gov/notices_s/848489/BA/ A ToO observation with Swift/XRT has been requested.