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GCN Circular 39151

Subject
IPN triangulation of GRB 250201A
Date
2025-02-05T15:21:26Z (5 days ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
Via
Web form
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 39112Loading...
 
 ; 
BALROG localization: Preis & Greiner, GCN 39113Loading...
 
 ;
INTEGRAL SPI/ACS detection: Barria et al., GCN 39117Loading...
 
 )
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.