TITLE: GCN CIRCULAR NUMBER: 46094 SUBJECT: IPN triangulation of GRB 261024D DATE: 26/10/29 15:17:19 GMT FROM: Anna Ridnaia 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, A. Ridnaia, D. Frederiks, A. Lysenko, V. Panteleeva, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, E. Burns on behalf of the IPN, A. Arya (IITB), G. Waratkar (Caltech/IITB), V. Bhalerao (IITB) on behalf of AstroSat/CZTI 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 261024D (AstroSat-CZTI detection: Goyal et al., GCN 46040; NuSTAR-ACS detection: Waratkar & Grefenstette, GCN 46051; Glowbug detection: Cheung et al., GCN 46053; GECAM-B detection: Luo et al., GCN 46061; Insight-HXMT/HE detection: Luo et al., GCN 46065) was detected by AstroSat (CZTI), NuSTAR (ACS), SVOM (GRM), Glowbug, GECAM-B, Insight (HXMT), Konus-Wind and Mars-Odyssey (HEND) at about 77582 s UT (21:33:02). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 212.913 (14h 11m 39s) +31.361 (+31d 21' 39") Corners: 211.453 (14h 05m 49s) +23.721 (+23d 43' 15") 214.144 (14h 16m 35s) +38.561 (+38d 33' 38") 214.045 (14h 16m 11s) +38.529 (+38d 31' 45") 211.361 (14h 05m 27s) +23.673 (+23d 40' 23") --------------------------------------------- The error box area is 1.1 sq. deg, and its maximum dimension is 15 deg (the minimum one is 4 arcmin). The Sun distance was 36 deg. This localization may be improved. A triangulation map and HEALPix FITS file are posted at https://www.ioffe.ru/LEA/GRBs/GRB261024_T77582/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.