TITLE: GCN CIRCULAR NUMBER: 34126 SUBJECT: IPN triangulation of GRB 230625B (ultra-long) DATE: 23/06/30 23:54:32 GMT FROM: Dmitry Svinkin at Ioffe Institute A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars Odyssey team, D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, E. Burns on behalf of the IPN, 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 ultra-long GRB 230625B (Swift-BAT/GUANO detection: Ronchini et al., GCN Circ. 34084; AstroSat-CZTI detection: Navaneeth et al., GCN Circ. 34119; CALET-GBM detection: Asaoka et al., GCN Circ. 34123) was detected by Konus-Wind, INTEGRAL (SPI-ACS), AstroSat (CZTI), CALET (GBM triggers 1371713313 and 1371714158), Swift (BAT), and Mars-Odyssey (HEND) at about 26925 s UT (07:28:45). The burst was outside the coded field of view of the BAT. As observed by Konus-Wind, the burst light curve shows a multi-peaked structure with the total duration of ~1100 s. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: ------------------------------ RA(2000), deg Dec(2000), deg ------------------------------ Center: 348.047 +27.385 Corners: 359.451 +18.898 359.209 +18.406 324.407 +33.245 323.504 +33.777 ------------------------------- The error box area is 18.4 sq. deg, and its maximum dimension is 35.3 deg (the minimum one is 31.4 arcmin). The Sun distance was about 86 deg. This box may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB230625_T26937/IPN The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB230625_T26937 A detailed analysis of the Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.