TITLE: GCN CIRCULAR NUMBER: 30993 SUBJECT: IPN Triangulation of GRB 211019A DATE: 21/10/25 15:02:56 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru> 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, K. Hurley on behalf of the IPN, D. Svinkin, S. Golenetskii, D. Frederiks, A. Ridnaia, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge 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, and W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report: The bright, long-duration GRB 211019A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 30941; BALROG localization: F. Kunzweiler et al., GCN Circ. 30942; GRBAlpha detection: J. Ripa et al., GCN Circ. 30946) was detected by BepiColombo (MGNS; see introductory GCN Circ. 30949), Mars-Odyssey (HEND), GRBAlpha, Fermi (GBM trigger 656315976), Konus-Wind, and INTEGRAL (SPI-ACS), at about 21571 s UT (05:59:31). The burst light curves in the energy range 30 keV-1.5 MeV (HEND) and 250-450 keV (MGNS) exhibit a bright peak with a total duration of ~17 s. We have triangulated GRB 211019A to the following 3 sigma annuli: --------------------------------------------------------- R.A.(J2000) Dec.(J2000) R +dR -dR deg deg deg deg deg --------------------------------------------------------- MGNS-HEND 27.190 10.927 89.034 +0.021 -0.022 Konus-HEND 200.705 -8.093 87.815 +0.017 -0.017 Konus-GBM 190.965 -7.594 80.456 +0.431 -0.431 --------------------------------------------------------- The MGNS-HEND and Konus-HEND annuli intersect to form two error boxes one of which is inconsistent with the Konus-GBM annulus, the KW ecliptic latitude response, and the Fermi (GBM) RoboBA and BALROG localizations. The correct preliminary, 3 sigma error box is: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 106.988 (07h 07m 57s) -38.779 (-38d 46' 43") Corners: 106.975 (07h 07m 54s) -38.728 (-38d 43' 41") 106.898 (07h 07m 36s) -39.122 (-39d 07' 19") 107.002 (07h 08m 01s) -38.819 (-38d 49' 07") 107.079 (07h 08m 19s) -38.424 (-38d 25' 25") --------------------------------------------- The error box area is 49 sq. arcmin, and its maximum dimension is 43 arcmin (the minimum one is 2.0 arcmin). The Sun distance was 89 deg. This box may be improved. A triangulation maps are posted at: http://www.ioffe.ru/LEA/GRBs/GRB211019_T21573/IPN/ and http://l503.iki.rssi.ru/owncloud/index.php/s/bRzLdux7RLz1tVf