TITLE: GCN CIRCULAR NUMBER: 40630 SUBJECT: IPN triangulation of GRB 250404B DATE: 25/06/05 15:32:58 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,
D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team,
E. Burns on behalf of the IPN,
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, A. Tohuvavohu, and J. DeLaunay on behalf of the Swift-BAT team,
G. Waratkar, J.Joshi, V. Bhalerao, D. Bhattacharya, and S. Vadawale, on behalf of the Astrosat-CZTI 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 short-duration GRB 250404B (AstroSat CZTI detection: Salunke et al., GCN Circ. 40078) was detected by Konus-Wind, Swift (BAT), AstroSat (CZTI), and Mars-Odyssey (HEND) at about 66970 s UT (18:36:10). 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: 273.629 (18h 14m 31s) -2.251 ( -2d 15' 03") Corners: 273.108 (18h 12m 26s) -2.676 ( -2d 40' 35") 274.127 (18h 16m 31s) -1.659 ( -1d 39' 32") 274.151 (18h 16m 36s) -1.842 ( -1d 50' 30") 273.131 (18h 12m 31s) -2.866 ( -2d 51' 58") --------------------------------------------- The error box area is 768 sq. arcmin, and its maximum dimension is 1.6 deg (the minimum one is 9 arcmin). The Sun distance was 100 deg.
This localization may be improved.
A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB250404_T66970/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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