TITLE: GCN CIRCULAR NUMBER: 16184 SUBJECT: IPN Triangulation of GRB 140428B (short/hard) DATE: 14/04/29 19:10:53 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline, on behalf of the Konus-Wind team, K. Hurley, on behalf of the Interplanetary Network, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and V. Connaughton, M. S. Briggs, C. Meegan, and V. Pelassa, on behalf of the Fermi GBM team, report: The short-duration, hard spectrum GRB 140428B has been observed by Fermi (GBM: trigger 420414281), INTEGRAL (SPI-ACS), Konus-Wind, and Mars Odyssey (HEND), so far, at about 78278 s UT (21:44:38). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 2.006 (00h 08m 01s) +68.172 (+68d 10' 20") Corners: 6.132 (00h 24m 32s) +68.636 (+68d 38' 09") 2.619 (00h 10m 29s) +68.455 (+68d 27' 18") 358.176 (23h 52m 42s) +67.601 (+67d 36' 04") 1.415 (00h 05m 40s) +67.887 (+67d 53' 13") --------------------------------------------- The error box area is 0.608 sq. deg, and its maximum dimension is 3.14 deg (the minimum one is 18 arcmin). This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB140428_T78275/IPN/ The time history and spectrum will be given in a forthcoming GCN Circular.