TITLE: GCN CIRCULAR NUMBER: 34845 SUBJECT: IPN triangulation of GRB 231018A DATE: 23/10/19 18:41:19 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru> D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, 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, report: The bright, long-duration GRB 231018A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 34826; BALROG localization: Preis et al., GCN Circ. 34827) has been detected by Fermi (GBM trigger 719325015), CALET (GBM), GECAM-B, INTEGRAL (SPI-ACS), Konus-Wind, and Swift (BAT), so far, at about 45010 s UT (12:30:10). 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: 1.122 (00h 04m 29s) +47.410 (+47d 24' 36") Corners: 6.422 (00h 25m 41s) +50.650 (+50d 39' 01") 356.061 (23h 44m 15s) +43.842 (+43d 50' 31") 357.865 (23h 51m 28s) +44.479 (+44d 28' 43") 10.820 (00h 43m 17s) +51.565 (+51d 33' 55") --------------------------------------------- The error box area is 6.6 sq. deg, and its maximum dimension is 12.54 deg (the minimum one is 38 arcmin). The Sun distance was 137 deg. The IPN localization is consistent with, but reduces the area of, the final Fermi-GBM and the BALROG localizations. This localization may be improved. A triangulation map and HEALPix FITS files are posted at http://www.ioffe.ru/LEA/GRBs/GRB231018_T45043/IPN The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. View this GCN Circular online at https://gcn.nasa.gov/circulars/34845. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...