TITLE: GCN CIRCULAR NUMBER: 16369 SUBJECT: IPN Triangulation of GRB 140606B DATE: 14/06/09 17:03:13 GMT FROM: Dmitry Svinkin at Ioffe Institute K. Hurley and J. Goldsten, on behalf of the MESSENGER NS GRB team, S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, and V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa, and A. Goldstein, on behalf of the Fermi GBM team, report: The long-duration GRB 140606B has been observed by Fermi (Burns GCN Circ. 16363), Konus-Wind, and MESSENGER (GRNS), so far, at about 11512 s UT (03:11:52). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 327.109 (21h 48m 26s) +33.047 (+33d 02' 50") Corners: 321.995 (21h 27m 59s) +37.333 (+37d 19' 58") 321.768 (21h 27m 04s) +38.102 (+38d 06' 06") 332.033 (22h 08m 08s) +27.958 (+27d 57' 29") 332.250 (22h 09m 00s) +26.987 (+26d 59' 14") --------------------------------------------- The error box area is 5.53 sq. deg, and its maximum dimension is 14.18 deg (the minimum one is 0.414 deg). This box may be improved. Only two of the reported optical sources (Singer et al. GCN Circ. 16360), namely iPTF14bfw and iPTF14bfu, are inside the box, and iPTF14bfw was found to be a constant source (Perley and Singer, GCN Circ. 16362). The distance between the narrowest annulus (GBM-MESSENGER annulus with 3 sigma half width of 0.207 deg) center line and the iPTF14bfu (the fading source) is 2 arcsec, strengthening the association of the transient and the GRB. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB140606_T11511/IPN/ Details of the Konus-Wind observation will be given in a forthcoming GCN Circular.