TITLE: GCN CIRCULAR NUMBER: 16444 SUBJECT: IPN Triangulation of GRB 140621A DATE: 14/06/23 17:10:14 GMT FROM: Dmitry Svinkin at Ioffe Institute S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN team, S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa, and A. Goldstein, on behalf of the Fermi GBM team, and K. Yamaoka, M. Ohno, Y. Hanabata, Y. Fukazawa, T. Takahashi, M. Tashiro, Y. Terada, T. Murakami, and K. Makishima on behalf of the Suzaku WAM team, report: The long-duration GRB 140621A has been observed by Konus-Wind, Fermi(GBM trigger 425073013), Swift (BAT), Suzaku (WAM), and INTEGRAL (SPI-ACS), so far, at about 71411 s UT (19:50:11). The burst was outside the coded field of view of the BAT. We have triangulated it to a Konus-SPI-ACS annulus centered at RA(2000)=73.277 deg (04h 53m 07s) Dec(2000)=+14.648 deg (+14d 38' 54"), whose radius is 46.161 ± 0.185 deg (3 sigma), and to a GBM-SPI-ACS annulus centered at RA(2000)=295.874 deg (19h 43m 30s) Dec(2000)=+52.624 deg (+52d 37' 26"), whose radius is 73.043 ± 1.325 deg (3 sigma). These annuli intersect to form the error box whose portion with declination lower than about 22.2 degrees is ruled out due to the BAT non-detection in the coded FoV. The corners of the combined IPN+BAT box are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Corners: 24.883 (01h 39m 32s) +22.492 (+22d 29' 30") 25.291 (01h 41m 10s) +22.804 (+22d 48' 16") 25.278 (01h 41m 07s) +22.200 (+22d 12' 00") 24.879 (01h 39m 31s) +22.200 (+22d 12' 00") --------------------------------------------- The error box area is about 720 sq. arcmin, and its maximum dimension is 43 arcmin. This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB140621_T71407/IPN/ A Swift ToO observation has been requested. The time history and spectrum will be given in a forthcoming GCN Circular.