TITLE: GCN CIRCULAR NUMBER: 20722 SUBJECT: IPN Triangulation of GRB 170222A (short/hard) DATE: 17/02/22 13:52:53 GMT FROM: Dmitry Svinkin at Ioffe Institute K. Hurley, on behalf of the IPN, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa, and A. Goldstein, on behalf of the Fermi GBM team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report: The short-duration, hard-spectrum GRB 170222A has been detected by Fermi (GBM trigger 509432464), Konus-Wind, INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), Swift (BAT), and CALET (GBM), so far, at about 18059 s UT (05:00:59). 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: 292.956 (19h 31m 49s) +28.211 (+28d 12' 40") Corners: 292.896 (19h 31m 35s) +27.812 (+27d 48' 44") 292.864 (19h 31m 27s) +28.266 (+28d 15' 59") 293.017 (19h 32m 04s) +28.608 (+28d 36' 28") 293.048 (19h 32m 12s) +28.156 (+28d 09' 22") --------------------------------------------- The error box area is 254 sq. arcmin, and its maximum dimension is 0.8 deg (the minimum one is 9.36 arcmin). The Sun distance was 56 deg. This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB170222_T18056/IPN/ A Swift ToO request has been approved. The time history and spectrum will be given in forthcoming GCN Circulars.