TITLE: GCN CIRCULAR NUMBER: 44458 SUBJECT: IPN triangulation of GRB 260428A DATE: 26/05/04 15:04:29 GMT FROM: Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru> A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars Odyssey team, A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi-GBM team, C. Wang (IHEP), S. Xiong (IHEP), S. Zhang (IHEP), J. Wei (NAOC), B. Cordier (CEA) on behalf of the SVOM-GRM team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The short-duration GRB 260428A (Fermi-GBM detection: Fermi GBM team, GCN Circ. 44415; AstroSat-CZTI detection: Goyal et al., GCN Circ. 44421; GECAM-B detection: Wang et al., GCN Circ. 44423; SVOM/GRM observation: Wang et al., GCN Circ. 44424) was detected by Fermi (GBM), Konus-Wind, AstroSat (CZTI), GECAM-B, SVOM (GRM), and Mars-Odyssey (HEND) at about 51636 s UT (14:20:36). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 283.386 (18h 53m 33s) +0.365 ( +0d 21' 53") Corners: 283.274 (18h 53m 06s) +1.978 ( +1d 58' 41") 283.221 (18h 52m 53s) +2.065 ( +2d 03' 56") 283.504 (18h 54m 01s) -1.335 ( -1d 20' 06") 283.558 (18h 54m 14s) -1.435 ( -1d 26' 07") --------------------------------------------- The error box area is 561 sq. arcmin, and its maximum dimension is 3.5 deg (the minimum one is 3 arcmin). The Sun distance was 111 deg. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB260428_T51639/IPN The HEALPix triangulation map is the multi-order HEALPix in units of probability density. The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. View this GCN Circular online at https://gcn.nasa.gov/circulars/44458. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...