TITLE: GCN CIRCULAR NUMBER: 39653 SUBJECT: IPN triangulation of GRB 250308A (short) DATE: 25/03/10 16:02:51 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,
Y. Zhang, C. Wang, S. Xiong, J. Wei, and B. Cordier on behalf of the SVOM-GRM team,
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team,
E. Burns on behalf of the IPN,
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 250308A (SVOM-GRM detection: Wang et al., GCN 39632, 39636) was detected by SVOM (GRM), Konus-Wind, Swift (BAT), CALET (GBM), and Mars-Odyssey (HEND) at about 65191 s UT (18:06:31). 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: 160.761 (10h 43m 03s) +23.741 (+23d 44' 26") Corners: 160.858 (10h 43m 26s) +24.405 (+24d 24' 18") 160.981 (10h 43m 55s) +24.338 (+24d 20' 15") 160.655 (10h 42m 37s) +23.074 (+23d 04' 27") 160.536 (10h 42m 09s) +23.145 (+23d 08' 43") --------------------------------------------- The error box area is 578 sq. arcmin, and its maximum dimension is 1.3 deg (the minimum one is 7.4 arcmin). The Sun distance was 159 deg.
This localization may be improved.
The distance between the center of SVOM (GRM) localization (GCN 39636) and the IPN box center is 9.4 deg.
A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB250308_T65194/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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