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GCN Circular 33323

Subject
IPN triangulation of GRB 230209B
Date
2023-02-14T13:25:05Z (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 MGNS/BepiColombo and HEND/Mars Odyssey teams,

J. Benkhoff on behalf of the BepiColombo 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 230209B
(Fermi-GBM detection: the Fermi GBM team, GCN Circ. 33310;
Swift/BAT-GUANO detection: Raman et al., GCN Circ. 33315)
was detected by Fermi (GBM trigger 697674761), Konus-Wind,
INTEGRAL (SPI-ACS), Swift (BAT), Mars-Odyssey (HEND),
and BepiColombo (MGNS) at about 81157 s UT (22:32:37).
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:
    89.366 (05h 57m 28s) +29.199 (+29d 11' 57")
  Corners:
    89.445 (05h 57m 47s) +29.700 (+29d 41' 58")
    89.336 (05h 57m 21s) +30.139 (+30d 08' 22")
    89.289 (05h 57m 09s) +28.600 (+28d 35' 59")
    89.401 (05h 57m 36s) +27.754 (+27d 45' 15")
  ---------------------------------------------
The error box area is 674 sq. arcmin, and its maximum
dimension is 2.4 deg (the minimum one is 6.6 arcmin).
The Sun distance was 128 deg.

This box may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB230209_T81161/IPN

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