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GCN Circular 33123

Subject
IPN triangulation of GRB 221226A
Date
2022-12-30T11:32:54Z (a year 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,

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 221226A
(Fermi-GBM detection, the Fermi GBM team, GCN Circ. 33104;
AGILE detection: Panebianco et al., GCN Circ. 33113;
Swift/BAT-GUANO detection: Raman et al., GCN Circ. 33121)
was detected by Fermi(GBM trigger 693765872), AGILE,
Konus-Wind, and INTEGRAL (SPI-ACS), Swift (BAT),
and Mars-Odyssey (HEND) at about 60267 s UT (16:44:27).
The burst was outside the coded field of view of the BAT.

We have triangulated it to a preliminary, error box
whose coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
    66.901 (04h 27m 36s) +36.975 (+36d 58' 30")
  Corners:
    69.415 (04h 37m 40s) +37.331 (+37d 19' 50")
    64.543 (04h 18m 10s) +37.133 (+37d 07' 58")
    64.358 (04h 17m 26s) +36.223 (+36d 13' 23")
    69.171 (04h 36m 41s) +36.500 (+36d 30' 00")
  ---------------------------------------------
The error box area is 3.3 sq. deg, and its maximum
dimension is 4.2 deg (the minimum one is 51 arcmin).
The Sun distance was 150 deg.

This box may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB221226_T60271/IPN

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