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GCN Circular 32190

Subject
IPN triangulation of GRB 220609B
Date
2022-06-11T17:02:25Z (2 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@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,

A. Ridnaia, D. Frederiks, D. Svinkin, 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,

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 220609B
(CALET-CGBM detection: Asaoka et al., GCN Circ 32185;
AstroSat-CZTI detection: Gopalakrishnan et al., GCN Circ 32186)
has been detected by Konus-Wind, CALET (CGBM), AstroSat (CZTI),
INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), BepiColombo (MGNS),
and GECAM-B, so far, at about 44473 s UT (12:21:13).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  347.791 (23h 11m 10s)  +0.385 ( +0d 23' 05")
 Corners:
  348.003 (23h 12m 01s)  -0.627 ( +0d 37' 39")
  347.702 (23h 10m 49s)  +0.442 ( +0d 26' 31")
  347.634 (23h 10m 32s)  +1.229 ( +1d 13' 46")
  347.880 (23h 11m 31s)  +0.327 ( +0d 19' 37")
 ---------------------------------------------
The error box area is 515 sq. arcmin, and its maximum
dimension is 1.9 deg (the minimum one is 8.4 arcmin).
The Sun distance was 89 deg.

This box may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB220609_T44473/IPN/

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