TITLE: GCN CIRCULAR NUMBER: 39588 SUBJECT: IPN triangulation of GRB 250222A DATE: 25/03/04 12:59:51 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,
Y. Zhang, C. Wang, S. Xiong, J. Wei, and B. Cordier on behalf of the SVOM-GRM team,
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi GBM team,
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, report:
The long-duration GRB 250222A (SVOM-GRM detection: Wang et al., GCN 39454) was detected by SVOM (GRM), Konus-Wind, and INTEGRAL (SPI-ACS) at about 51859 s UT (14:24:19).
Fermi (GBM) and Swift (BAT) were taking data, but shows no rate increase at the burst time.
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 359.336 (23h 57m 21s) +0.946 ( +0d 56' 47") Corners: 335.308 (22h 21m 14s) +25.783 (+25d 47' 00") 352.637 (23h 30m 33s) +12.776 (+12d 46' 35") 6.156 (00h 24m 37s) -19.368 (-19d 22' 04") 2.915 (00h 11m 40s) -9.794 ( -9d 47' 40") --------------------------------------------- The error box area is 38.5 sq. deg, and its maximum dimension is 54 deg (the minimum one is 3 deg). The Sun distance was 25 deg.
This localization may be improved.
The SVOM (GRM) localization (GCN 39454) is inconsistent with the IPN localization and also with burst non-detection by Fermi (GBM) and Swift (BAT).
A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB250222_T51862/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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