TITLE: GCN CIRCULAR NUMBER: 35311 SUBJECT: IPN triangulation of GRB 231129C DATE: 23/12/10 19:03:56 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, D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, 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, 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 very bright, long-duration GRB 231129C (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 35217; Sharma et al., GCN Circ. 35221, 35227; BALROG localization: Preis et al., GCN Circ. 35222; MAXI-GSC detection: Kawakubo et al., GCN Circ. 35223; CALET-CGBM detection: Shimizu et al., GCN Circ. 35228; AstroSat-CZTI detection: Waratkar et al., GCN Circ. 35230; GECAM-B detection: Zheng and Xiong, GCN Circ. 35231; Glowbug detection: Cheung et al., GCN Circ. 35235; GRBAlpha detection: Dafcikova et al., GCN Circ. 35236; Fermi-LAT detection: Arimoto et al., GCN Circ. 35238; Swift-BAT/GUANO detection: DeLaunay et al., GCN Circ. 35242; AGILE detection: Panebianco et al., GCN Circ. 35244; Konus-Wind detection: Lysenko et al., GCN Circ. 35256; ASIM-MXGS detection: Marisaldi et al., GCN Circ. 35288) was detected by Fermi (GBM, LAT), ISS (Glowbug, CALET-CGBM), AstroSat (CZTI), GECAM-B (GRD), GRBAlpha, AGILE (MCAL, AC), Swift (BAT), Konus-Wind, INTEGRAL (SPI-ACS), GRBAlpha, Mars-Odyssey (HEND), and BebiColombo (MGNS) at about 69018 s UT (19:10:18). 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: 9.975 (00h 39m 54s) -81.812 (-81d 48' 43") Corners: 4.821 (00h 19m 17s) -80.799 (-80d 47' 56") 16.263 (01h 05m 03s) -82.675 (-82d 40' 29") 16.443 (01h 05m 46s) -82.746 (-82d 44' 45") 4.881 (00h 19m 31s) -80.873 (-80d 52' 23") --------------------------------------------- The error box area is 322 sq. arcmin, and its maximum dimension is 2.5 deg (the minimum one is 2.2 arcmin). The Sun distance was 73 deg. This localization may be improved. The IPN localization is consistent with, but reduces the area of, the Fermi-GBM/LAT and ASIM localizations. The Swift-XRT reported Source 2 (GCN 35234, 35251) is inside the IPN box, supporting that the source is the afterglow of GRB 231129C. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB231129_T69016/IPN/ View this GCN Circular online at https://gcn.nasa.gov/circulars/35311. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...