TITLE: GCN CIRCULAR NUMBER: 33323 SUBJECT: IPN triangulation of GRB 230209B DATE: 23/02/14 13:25:05 GMT FROM: Dmitry Svinkin at Ioffe Institute A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the MGNS/BepiColombo and HEND/Mars Odyssey teams, J. Benkhoff on behalf of the BepiColombo team, D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi GBM 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: The long-duration GRB 230209B (Fermi-GBM detection: the Fermi GBM team, GCN Circ. 33310; Swift/BAT-GUANO detection: Raman et al., GCN Circ. 33315) was detected by Fermi (GBM trigger 697674761), Konus-Wind, INTEGRAL (SPI-ACS), Swift (BAT), Mars-Odyssey (HEND), and BepiColombo (MGNS) at about 81157 s UT (22:32:37). The burst was outside the coded field of view of the BAT. We have triangulated it to a preliminary, error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 89.366 (05h 57m 28s) +29.199 (+29d 11' 57") Corners: 89.445 (05h 57m 47s) +29.700 (+29d 41' 58") 89.336 (05h 57m 21s) +30.139 (+30d 08' 22") 89.289 (05h 57m 09s) +28.600 (+28d 35' 59") 89.401 (05h 57m 36s) +27.754 (+27d 45' 15") --------------------------------------------- The error box area is 674 sq. arcmin, and its maximum dimension is 2.4 deg (the minimum one is 6.6 arcmin). The Sun distance was 128 deg. This box may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB230209_T81161/IPN The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.