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GCN Circular 40888

Subject

IPN triangulation of GRB 250627A (short)

Event

GRB 250627A

Date

2025-07-02T16:13:38Z (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,

E. Burns on behalf of the IPN,

Y. Zhang, C. Wang, S. Xiong, J. Wei, and B. Cordier
on behalf of the SVOM-GRM 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 short-duration GRB 250627A
(SVOM-GRM detection: Wang et al., GCN 40871Loading...
 
 ;
Insight-HXMT detection: Wang et al., GCN 40872Loading...
 
 )
was detected by SVOM (GRM), Insight-HXMT, Konus-Wind, 
and Mars-Odyssey (HEND) at about 60378 s UT (16:46:18).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
   90.764 (06h 03m 03s) +10.097 (+10d 05' 48")
 Corners:
   90.676 (06h 02m 42s) +10.618 (+10d 37' 04")
   90.803 (06h 03m 13s)  +9.585 ( +9d 35' 07")
   90.855 (06h 03m 25s)  +9.577 ( +9d 34' 37")
   90.727 (06h 02m 55s) +10.609 (+10d 36' 32")
 ---------------------------------------------
The error box area is 185 sq. arcmin, and its maximum
dimension is 1.1 deg (the minimum one is 2.4 arcmin).
The Sun distance was 14 deg.

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB250627_T60377/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.