TITLE: GCN CIRCULAR NUMBER: 39144 SUBJECT: IPN triangulation of GRB 250202B DATE: 25/02/04 17:46:35 GMT FROM: Dmitry Svinkin at Ioffe Institute svinkin@mail.ioffe.ru
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,
G. Waratkar, J.Joshi, V. Bhalerao, D. Bhattacharya, and S. Vadawale, on behalf of the Astrosat-CZTI team,
and
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, report:
The bright long-duration GRB 250202B (Fermi-GBM detection: The Fermi GBM team, GCN 39120; Bala et al., GCN 39133; AstroSat-CZTI detection: Srijan et al., GCN 39122; NuSTAR-ACS detection: Grefenstette, GCN 39135) was detected by Fermi (GBM trigger 760161442), AstroSat (CZTI), Swift (BAT), Konus-Wind, and INTEGRAL (SPI-ACS) at about 14237 s UT (03:57:17). 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: 344.999 (22h 60m 00s) +19.593 (+19d 35' 35") Corners: 343.557 (22h 54m 14s) +22.051 (+22d 03' 04") 347.168 (23h 08m 40s) +17.149 (+17d 08' 56") 346.317 (23h 05m 16s) +17.129 (+17d 07' 44") 342.644 (22h 50m 34s) +22.024 (+22d 01' 27") --------------------------------------------- The error box area is 4.1 sq. deg, and its maximum dimension is 6.5 deg (the minimum one is 41.5 arcmin). The Sun distance was 45 deg.
This localization may be improved.
The IPN localization is consistent with, but reduces the area of, the Fermi-GBM (GCN 39120) localization.
A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB250202_T14235/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.
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