TITLE: GCN CIRCULAR NUMBER: 43564 SUBJECT: IPN triangulation of GRB 260121A DATE: 26/01/29 23:10:15 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 team, J. Benkhoff on behalf of the BepiColombo team, 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, M. Hui, and E. Burns on behalf of the Fermi GBM team, G. Waratkar, J.Joshi, V. Bhalerao, D. Bhattacharya, A. Arya, and S. Vadawale, on behalf of the Astrosat-CZTI team, E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, A. Tohuvavohu, and J. DeLaunay on behalf of the Swift-BAT team, and D. Kapshtan, M. Orlov, V. Bazunova, E. Shchepin, E. Meltsov, K. Starikov, A. Khogoev, on behalf of the 239Alferov team, report: The long-duration GRB 260121A was detected by Fermi (GBM; in continuous TTE data), Konus-Wind, Astrosat (CZTI), INTEGRAL (SPI-ACS), 239Alferov CubeSat, and BepiColombo-MGNS at about 8552 s UT (02:22:32). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 213.591 (14h 14m 22s) -62.629 (-62d 37' 45") Corners: 212.178 (14h 08m 43s) -65.088 (-65d 05' 17") 212.129 (14h 08m 31s) -64.984 (-64d 59' 01") 214.879 (14h 19m 31s) -60.111 (-60d 06' 38") 214.922 (14h 19m 41s) -60.220 (-60d 13' 11") --------------------------------------------- The error box area is 855 sq. arcmin, and its maximum dimension is 5.13 deg (the minimum one is 3 arcmin). The Sun distance was 72 deg. The localization may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB260121_T08549/IPN/ The HEALPix triangulation map is the multi-order HEALPix in units of probability density. 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/43564. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...