TITLE: GCN CIRCULAR NUMBER: 22908 SUBJECT: IPN Triangulation of GRB 180703B DATE: 18/07/06 05:14:31 GMT FROM: Anna Kozlova at Ioffe Institute K. Hurley, on behalf of the IPN, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report: The short duration GRB 180703B (Fermi-LAT detection: Racusin et al., GCN Circ. 22884; CGBM detection: Takahasi et al., GCN Circ. 22888; Fermi-GBM detection: Poolakkil and Meegan, GCN Circ. 22897) was detected by Fermi (GBM trigger 552350816), Konus-Wind, INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), CALET (CGBM), and Swift (BAT), at about 82009 s UT (22:46:49). The burst was outside the coded field of view of the BAT. We have triangulated it to a Konus-HEND annulus centered at RA(2000)=132.436 deg (08h 49m 45s) Dec(2000)=+22.998 deg (+22d 59' 54"), whose radius is 62.605 +/- 0.326 deg (3 sigma). The LAT position reported by Racusin et al. (GCN Circ. 22884) is consistent with the annulus. The annulus combined with the LAT (90 % containment, statistical-only) error circle gives the following error box: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 97.0594 -29.7187 Corners: 96.9223 -29.8774 97.2925 -30.1165 97.1962 -29.5599 96.5548 -29.6361 --------------------------------------------- The error box area is 894.7 sq. arcmin (a factor of 2 smaller than that of the LAT error circle). This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB180703_T82008/IPN