{
  "bibcode": "2026GCN.44329....1K",
  "eventId": "GRB 260411B",
  "subject": "IPN triangulation of GRB 260411B",
  "submittedHow": "web",
  "circularId": 44329,
  "createdOn": 1776438980754,
  "body": "A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin\non behalf of the HEND/Mars Odyssey team,\n\nA. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin,\nand T. Cline on behalf of the Konus-Wind team,\n\nA. Goldstein, M. S. Briggs, C. Wilson-Hodge,\nand E. Burns on behalf of the Fermi-GBM team,\n\nand\n\nW. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,\nand A.S. Gardner on on behalf of the GRS-Odyssey GRB team,\nreport:\n\nThe long-duration GRB 260411B\n(Fermi-GBM detection: The Fermi GBM team, GCN 44262,\nPathak & Sonawane, GCN 44266;\nBALROG localization: Preis & Greiner, GCN 44263;\nSVOM-GRM detection: Wang et al., GCN 44268;\nFermi-LAT detection: Longo et al., GCN 44277;\nGECAM-B detection: Zao et al., GCN 44285;\nGlowbug detection: Woolf et al., GCN 44312)\nwas detected by Fermi (GBM, LAT), Konus-Wind,\nSVOM (GRM), GECAM-B, Glowbug,\nand Mars-Odyssey (HEND) at about 29075 s UT (08:04:35).\n\nWe have triangulated it to a preliminary, 3 sigma error box\nwhose coordinates are:\n ---------------------------------------------\n  RA(2000), deg                 Dec(2000), deg\n ---------------------------------------------\n Center:\n   85.558 (05h 42m 14s)  +2.297 ( +2d 17' 50\")\n Corners:\n   85.572 (05h 42m 17s)  -0.527 ( +0d 31' 39\")\n   85.610 (05h 42m 26s)  -0.425 ( +0d 25' 29\")\n   85.523 (05h 42m 05s)  +5.509 ( +5d 30' 32\")\n   85.486 (05h 41m 57s)  +5.372 ( +5d 22' 20\")\n ---------------------------------------------\nThe error box area is 844 sq. arcmin, and its maximum\ndimension is 6.0 deg (the minimum one is 2.4 arcmin).\nThe Sun distance was 65 deg.\n\nThis localization may be improved.\n\nThe OT reported by GOTO (GOTO26dam, GCN 44265)\nis inside the IPN box, strengthening the association of the OT and GRB 260411B.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB260411_T29079/IPN/\nThe HEALPix triangulation map is the multi-order HEALPix in units of\nprobability density.\n\nThe Konus-Wind time history and spectrum will be given\nin a forthcoming GCN Circular.",
  "submitter": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
  "format": "text/plain"
}