TITLE: GCN CIRCULAR NUMBER: 35862 SUBJECT: IPN triangulation of GRB 240303B DATE: 24/03/04 18:38:51 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 HEND/Mars Odyssey 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, and E. Burns on behalf of the Fermi GBM team, E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The long-duration GRB 240303B (Fermi-GBM detection: The Fermi GBM team, GCN 35850; Hamburg and Meegan, GCN 35860; BALROG localization: Preiset al., GCN 35851; CALET-GBM detection: Nakahira et al., GCN 35857) has been detected by Fermi (GBM trigger 731161136), INTEGRAL (SPI-ACS), Konus-Wind, CALET (GBM), and Mars-Odyssey (HEND), so far, at about 44331 s UT (12:18:51). We have triangulated this GRB to the following annuli: --------------------------------------------------- annulus R.A. Dec. R dR (3sigma) (deg) (deg) (deg) (deg) --------------------------------------------------- Konus-GBM 320.846 -16.019 24.529 2.743 GBM-SPI-ACS 194.036 78.908 88.157 8.554 GBM-HEND 317.319 -17.507 23.796 0.133 --------------------------------------------------- The annuli intersect to form a long 8.1 sq.deg (3 sigma) localization region. The IPN localization is consistent with, but reduces the area of, the Fermi-GBM final and the BALROG localizations. This localization may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB240303_T44327/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/35862. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...