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GCN Circular 31598

Subject
IPN triangulation of GRB 220209A
Date
2022-02-16T13:28:54Z (2 years 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 team,

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, and C. Wilson-Hodge
on behalf of the Fermi GBM team,

A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo,
and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB 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 220209A
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 31561;
Lesage eat al., GCN Circ. 31565;
AGILE-MCAL detection: Ursi et al., GCN Circ. 31563;
GECAM detection: Zhang et al., GCN Circ. 31564;
Fermi-LAT detection: Pesce-Rollins et al., GCN Circ. 31577)
was detected by Fermi (GBM trigger 666140455), GECAM-B, AGILE (MCAL),
Konus-Wind, INTEGRAL (SPI-ACS), and BepiColombo (MGNS)
at about 82850 s UT (23:00:50).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   351.998 (23h 28m 00s) +69.556 (+69d 33' 22")
  Corners:
    19.772 (01h 19m 05s) +60.497 (+60d 29' 49")
    18.826 (01h 15m 18s) +61.426 (+61d 25' 34")
   310.634 (20h 42m 32s) +70.589 (+70d 35' 21")
   313.447 (20h 53m 47s) +70.575 (+70d 34' 31")
  ---------------------------------------------
The error box area is 7.1 sq. deg, and its maximum
dimension is 28.4 deg (the minimum one is 15.5 arcmin).
The Sun distance was 85 deg.

This box may be improved.

The IPN localization is consistent with, but reduces the area of, the
Fermi-GBM final position (GCN Circ. 31561) and the BALROG position
(https://grb.mpe.mpg.de/grb/GRB220209959/) localizations.

The distance between the center of the Fermi (LAT) position (GCN 31577) 
and the IPN error box is 3.3 deg.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB220209_T82859/IPN/

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