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GCN Circular 34126

Subject
IPN triangulation of GRB 230625B (ultra-long)
Date
2023-06-30T23:54:32Z (10 months ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
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. Ridnaia, A. Lysenko,
and T. Cline on behalf of the Konus-Wind 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,

E. Burns on behalf of the IPN,

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 ultra-long GRB 230625B
(Swift-BAT/GUANO detection: Ronchini et al., GCN Circ. 34084Not found
 
 
;
AstroSat-CZTI detection: Navaneeth et al., GCN Circ. 34119Not found
 
 
;
CALET-GBM detection: Asaoka et al., GCN Circ. 34123Not found
 
 
)
was detected by Konus-Wind, INTEGRAL (SPI-ACS), AstroSat (CZTI),
CALET (GBM triggers 1371713313 and 1371714158), Swift (BAT),
and Mars-Odyssey (HEND) at about 26925 s UT (07:28:45).
The burst was outside the coded field of view of the BAT.

As observed by Konus-Wind, the burst light curve shows a multi-peaked structure with the total duration of ~1100 s.

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ------------------------------
  RA(2000), deg  Dec(2000), deg
 ------------------------------
 Center:
    348.047      +27.385
 Corners:
    359.451      +18.898
    359.209      +18.406
    324.407      +33.245
    323.504      +33.777
 -------------------------------
The error box area is 18.4 sq. deg, and its maximum
dimension is 35.3 deg (the minimum one is 31.4 arcmin).
The Sun distance was about 86 deg.

This box may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB230625_T26937/IPN

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB230625_T26937

A detailed analysis of the Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.