{
  "subject": "IPN triangulation of GRB 230418A (short)",
  "submitter": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
  "circularId": 33659,
  "bibcode": "2023GCN.33659....1K",
  "eventId": "GRB 230418A",
  "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, and\nT. 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\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 short-duration GRB 230418A\n(Fermi-GBM detection: Roberts et al., GCN Circ. 33652;\nSwift/BAT-GUANO detection: Ronchini et al., GCN Circ. 33653;\nAGILE detection: Panebianco et al., GCN Circ. 33656;\nAstroSat-CZTI detection: Navaneeth et al., GCN Circ. 33657)\nwas detected by Fermi (GBM trigger 703545098), Swift (BAT),\nKonus-Wind, INTEGRAL (SPI-ACS), AGILE (MCAL, AC), AstroSat (CZTI),\nand Mars-Odyssey (HEND) at about 76293 s UT (21:11:33).\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   43.442 (02h 53m 46s) -20.343 (-20d 20' 36\")\n Corners:\n   43.565 (02h 54m 16s) -20.460 (-20d 27' 37\")\n   43.510 (02h 54m 02s) -20.481 (-20d 28' 53\")\n   43.320 (02h 53m 17s) -20.226 (-20d 13' 34\")\n   43.375 (02h 53m 30s) -20.205 (-20d 12' 19\")\n ---------------------------------------------\nThe error box area is 61 sq. arcmin, and its maximum\ndimension is 20 arcmin (the minimum one is 3.2 arcmin).\nThe Sun distance was 35 deg.\n\nThis box may be improved.\n\nThe IPN localization is consistent with, but reduces the area of,\nthe Fermi-GBM final localization (GCN 33652).\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB230418_T76289/IPN\n\nThe Konus-Wind time history and spectrum will be given in a forthcoming\nGCN Circular.\n",
  "createdOn": 1682001046506
}