{
  "bibcode": "2022GCN.31958....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\nD. Svinkin, D. Frederiks, A. Ridnaia, 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\nS. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu\non behalf of the Swift-BAT 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 very bright, long-duration GRB 220426A\n(BALROG localization: Biltzinger et al., GCN Circ. 31950;\nSwift/BAT-GUANO detection: Tohuvavohu et al., GCN Circ. 31954;\nFermi-GBM detection: Malacaria and Meegan, GCN Circ. 31955)\nhas been detected by Fermi (GBM trigger 672648596), INTEGRAL (SPI-ACS),\nSwift (BAT), Konus-Wind, and Mars-Odyssey (HEND), so far,\nat about 24591 s UT (06:49:51).\nThe burst was outside the coded field of view of the BAT.\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   338.692 (22h 34m 46s) -22.994 (-22d 59' 38\")\n  Corners:\n   337.871 (22h 31m 29s) -22.760 (-22d 45' 38\")\n   337.994 (22h 31m 59s) -23.010 (-23d 00' 37\")\n   339.494 (22h 37m 59s) -23.176 (-23d 10' 35\")\n   339.374 (22h 37m 30s) -22.943 (-22d 56' 35\")\n  ---------------------------------------------\nThe error box area is 1131 sq. arcmin, and its maximum\ndimension is 1.6 deg (the minimum one is 13.6 arcmin).\nThe Sun distance was 64 deg.\n\nThis box may be improved.\n\nThe IPN localization is consistent with, but reduces the area of, the\nFermi GBM Final Real-time position (GCN Circ. 31955) and BALROG\n(GCN 31950) localizations.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB220426_T24589/IPN/\n\nSwift ToO has been approved.\n\nThe Konus-Wind time history and spectrum will be given in a forthcoming\nGCN Circular.",
  "circularId": 31958,
  "createdOn": 1651087824000,
  "email": "svinkin@mail.ioffe.ru",
  "subject": "IPN triangulation of GRB 220426A",
  "submitter": "Dmitry Svinkin at Ioffe Institute  <svinkin@mail.ioffe.ru>",
  "eventId": "GRB 220426A"
}