TITLE: GCN CIRCULAR NUMBER: 42403 SUBJECT: IPN triangulation of GRB 251016B DATE: 25/10/23 16:17:46 GMT FROM: Dmitry Svinkin at Ioffe Institute svinkin@mail.ioffe.ru
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the MGNS/BepiColombo and HEND/Mars Odyssey teams,
J. Benkhoff on behalf of the BepiColombo team,
D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, 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,
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, A. Tohuvavohu, and J. DeLaunay on behalf of the Swift-BAT 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 long-duration GRB 251016B (Ferm-GBM detection: The Fermi GBM team, GCN 42316; Godwin et al., GCN 42383; CALET-GBM detection: Yamaoka et al., GCN 42320; AstroSat-CZTI detection: Harsha et al., GCN 42324) was detected by Fermi (GBM trigger 782351945), CALET (GBM), AstroSat (CZTI), Konus-Wind, Swift (BAT), Mars-Odyssey (HEND), and BepiColombo (MGNS), at about 86340 s UT (23:59:00). The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 180.582 (12h 02m 20s) +57.856 (+57d 51' 21") Corners: 173.603 (11h 34m 25s) +54.048 (+54d 02' 53") 182.331 (12h 09m 19s) +58.703 (+58d 42' 09") 191.445 (12h 45m 47s) +61.827 (+61d 49' 37") 178.988 (11h 55m 57s) +57.018 (+57d 01' 07") --------------------------------------------- The error box area is 2295 sq. arcmin, and its maximum dimension is 12.186 deg (the minimum one is 5 arcmin). The Sun distance was 69 deg.
This localization may be improved.
A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB251016_T86340/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.
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