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GCN Circular 38953

Subject
IPN triangulation of GRB 250113A
Date
2025-01-15T13:32:01Z (7 days ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@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,

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. Burns on behalf of the IPN,

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 250113A
(SVOM-GRM detection: Wang et al., GCN 38923Loading...
 
 ;
INTEGRAL-SPI-ACS detection: Barria et al., GCN 38935Loading...
 
 )
was detected by SVOM (GRM), Konus-Wind, INTEGRAL (SPI-ACS),
Swift (BAT), and Mars-Odyssey(HEND), at about 23077 s UT (06:24:37).
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
 -------------------------------
 Corners:
   236.558        16.588
   236.711        16.218
   220.529       -15.743
   220.199       -15.607
 -------------------------------
The error box area is 12.2 sq. deg, and its maximum
dimension is 36.0 deg (the minimum one is 20 arcmin).
The Sun distance was 68 deg.

This localization may be improved.

A triangulation map and HEALPix FITS files are posted at
http://www.ioffe.ru/LEA/GRBs/GRB250113_T23073/IPN
The HEALPix triangulation maps are in units of probability density.

The Konus-Wind time history and spectrum will be given
in a forthcoming GCN Circular.