//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31895 SUBJECT: IPN triangulation of short/soft GRB 220406A DATE: 22/04/13 11:25:59 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, D. Svinkin, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT 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: A short-duration, soft GRB 220406A was detected by Konus-Wind, INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), and Swift (BAT) at about 1661 s UT (00:27:41). The burst was outside the coded field of view of the BAT. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 324.994 (21h 39m 59s) +64.925 (+64d 55' 31") Corners: 330.496 (22h 01m 59s) +64.859 (+64d 51' 31") 319.682 (21h 18m 44s) +64.833 (+64d 49' 59") 319.519 (21h 18m 04s) +64.773 (+64d 46' 21") 330.308 (22h 01m 14s) +64.812 (+64d 48' 43") --------------------------------------------- The error box area is 882 sq. arcmin, and its maximum dimension is 4.7 deg (the minimum one is 3 arcmin). The Sun distance was 66 deg. This box may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB220406_T01660/IPN The time history and spectrum will be given in forthcoming GCN Circulars.