TITLE: GCN CIRCULAR NUMBER: 31024 SUBJECT: IPN triangulation of GRB 211022A DATE: 21/10/30 12:36:29 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. von Kienlin, X. Zhang, A. Rau, V. Savchenko, 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, and R. Starr, on behalf of the GRS-Odyssey GRB team, report:
The long-duration GRB 211022A (GECAM-B detection: Zhao et al., GCN Circ. 30955; AstroSat-CZTI detection: Prasad et al., GCN Circ. 30968) was detected by BepiColombo (MGNS; see introductory GCN Circ. 30949), Mars-Odyssey (HEND), GECAM-B, AstroSat (CZTI), Konus-Wind, INTEGRAL (SPI-ACS), and Swift (BAT), at about 2845 s UT (00:47:25). The burst was outside the coded field of view of the BAT.
The burst light curves in the energy range 30 keV-1.5 MeV (HEND) and 250-450 keV (MGNS) exhibit a multi-peaked pulse structure with a total duration of ~150 s.
We have triangulated GRB 211022A to the following 3 sigma annuli: ------------------------------------------------------------ R.A.(J2000) Dec.(J2000) R +dR -dR deg deg deg deg deg ------------------------------------------------------------ MGNS-HEND 30.161 12.392 125.005 +0.096 -0.214 SPI-ACS-HEND 202.386 -8.806 53.850 +0.093 -0.071 Konus-SPI-ACS 193.415 -14.239 44.866 +5.706 -5.232 ------------------------------------------------------------ The MGNS-HEND and SPI-ACS-HEND annuli intersect to form two error boxes one of which is inconsistent with the Konus-SPI-ACS annulus, the KW ecliptic latitude response, and the GECAM position.
The correct preliminary, 3 sigma error box is: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 161.615 (10h 46m 27s) -51.006 (-51d 00' 21") Corners: 160.852 (10h 43m 24s) -50.508 (-50d 30' 29") 162.525 (10h 50m 06s) -51.893 (-51d 53' 33") 161.845 (10h 47m 23s) -51.080 (-51d 04' 47") 160.242 (10h 40m 58s) -49.672 (-49d 40' 19") --------------------------------------------- The error box area is 1026 sq. arcmin, and its maximum dimension is 2.6 deg (the minimum one is 9.8 arcmin). The Sun distance was 54 deg.
This box may be improved.
A triangulation maps are posted at: http://www.ioffe.ru/LEA/GRBs/GRB211022_T02845/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.