{
  "bibcode": "2022GCN.31920....1K",
  "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, D. Svinkin, A. Lysenko,\nand T. Cline on behalf of the Konus-Wind team,\n\nA. Goldstein, M. S. Briggs, and C. Wilson-Hodge\non behalf of the Fermi GBM team,\n\nE. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB 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 220411A\n(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 31871;\nBALROG localization: Kunzweiler et al., GCN Circ. 31872;\nAstroSat CZTI detection: Gopalakrishnan et al., GCN Circ. 31879)\nwas detected by Fermi (GBM trigger 671354405), INTEGRAL (SPI-ACS),\nKonus-Wind, Mars-Odyssey (HEND), and AstroSat (CZTI)\nat about 26401 s UT (07:20:01).\n\nWe have triangulated it to a SPI-ACS-HEND annulus centered at\nRA(2000)=149.487 deg (09h 57m 57s)  Dec(2000)=+13.850 deg (+13d 50' 59\"),\nwhose radius is 30.455 +/- 0.229 deg (3 sigma).\n\nThe Fermi GBM Final Real-time (GCN Circ. 31871) and\nBALROG (GCN Circ. 31872) localizations are consistent with the annulus.\nThe annulus combined with the BALROG localization\ngives the following error box:\n------------------------------------------------------------\n   RA(2000), deg                 Dec(2000), deg\n------------------------------------------------------------\n  Center:\n   179.643 (11h 58m 34s) +25.001 (+25d 00' 04\")\n  Corners:\n   176.853 (11h 47m 25s) +31.565 (+31d 33' 54\")\n   176.353 (11h 45m 25s) +31.390 (+31d 23' 26\")\n   180.657 (12h 02m 38s) +18.050 (+18d 03' 01\")\n   181.134 (12h 04m 32s) +18.133 (+18d 07' 57\")\n------------------------------------------------------------\nThe error box area is 6.4 sq. deg, and its maximum\ndimension is 14 deg (the minimum one is 27 arcmin).\nThe Sun distance was 134 deg.\n\nThis box may be improved.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB220411_T26405/IPN\n\nThe time history and spectrum will be given in forthcoming GCN Circulars.",
  "circularId": 31920,
  "createdOn": 1650362849000,
  "email": "ridnaia@mail.ioffe.ru",
  "subject": "IPN triangulation of GRB 220411A",
  "submitter": "Anna Ridnaia at Ioffe Institute  <ridnaia@mail.ioffe.ru>",
  "eventId": "GRB 220411A"
}