TITLE: GCN CIRCULAR NUMBER: 44111 SUBJECT: IPN triangulation of GRB 260316B DATE: 26/03/25 13:33:31 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 HEND/Mars Odyssey team, D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, A. Goyal, A. Arya, M. Tembhurnikar, G. Waratkar, V. Bhalerao, D. Bhattacharya, and S. Vadawale, on behalf of the Astrosat-CZTI team, A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi-GBM 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 260316B (Ferm-GBM detection: The Fermi GBM team, GCN 44031; AstroSat-CZTI detection: Harsha et al., GCN 44035; SVOM-GRM detection: Zhang et al., GCN 44039; GECAM-B detection: Zhang et al., GCN 44040; CALET-GBM detection: Tamura et al., GCN 44100) was detected by Fermi (GBM trigger 795373977), Konus-Wind, Astrosat (CZTI), SVOM (GRM), GECAM-B, CALET (GBM), and Mars-Odyssey (HEND) at about 61973 s UT (17:12:53). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 345.026 (23h 00m 06s) -80.127 (-80d 07' 37") Corners: 292.551 (19h 30m 12s) -74.130 (-74d 07' 48") 293.015 (19h 32m 04s) -74.416 (-74d 24' 57") 32.817 (02h 11m 16s) -74.223 (-74d 13' 24") 32.021 (02h 08m 05s) -74.386 (-74d 23' 10") --------------------------------------------- The error box area is 1.7 sq. deg, and its maximum dimension is 24.2 deg (the minimum one is 4.3 arcmin). The Sun distance was 75 deg. This localization may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB260316_T61972/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/44111. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...