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GCN Circular 39000

Subject
IPN triangulation of GRB 250117A (short)
Date
2025-01-20T15:24:12Z (12 days ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
Via
Web form
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,

and

S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team,
report:

The short-duration GRB 250117A
(GECAM-B detection: Wang et al., GCN 38982Loading...
 
 ;
Swift/BAT-GUANO localization: DeLaunay et al., GCN 38988Loading...
 
 ;
SVOM/GRM detection: Wang et al., GCN 38994Loading...
 
 )
was detected by Konus-Wind, Fermi (GBM),
INTEGRAL (SPI-ACS), Swift (BAT), GECAM-B,
and SVOM (GRM), at about 73318 s UT (20:21:58).
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:
  249.314 (16h 37m 15s) -26.387 (-26d 23' 13")
 Corners:
  249.983 (16h 39m 56s) -33.454 (-33d 27' 16")
  248.910 (16h 35m 38s) -28.572 (-28d 34' 20")
  250.252 (16h 41m 01s) -19.117 (-19d 07' 02")
  249.847 (16h 39m 23s) -24.228 (-24d 13' 41")
 ---------------------------------------------
The error box area is 5.4 sq. deg, and its maximum
dimension is 14.3 deg (the minimum one is 36 arcmin).
The Sun distance was 46 deg.

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB250117_T73313/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.