TITLE: GCN CIRCULAR NUMBER: 39151 SUBJECT: IPN triangulation of GRB 250201A DATE: 25/02/05 15:21:26 GMT FROM: Anna Ridnaia at Ioffe Institute ridnaia@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,

A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, 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 long-duration GRB 250201A (Fermi-GBM detection: Fermi GBM team, GCN 39112; BALROG localization: Preis & Greiner, GCN 39113; INTEGRAL SPI/ACS detection: Barria et al., GCN 39117) was detected by Fermi (GBM), Konus-Wind, INTEGRAL (SPI-ACS), Swift (BAT), and Mars-Odyssey (HEND) at about 35987 s UT (09:59:47). 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: 115.287 -54.293 Corners: 137.464 -51.378 137.379 -51.074 93.570 -52.488 93.601 -52.814 ------------------------------- The error box area is 6.8 sq. deg, and its maximum dimension is 26.3 deg (the minimum one is 21 arcmin). The Sun distance was 101 deg.

A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB250201_T35989/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/39151. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...