GCN Circular 31783

Subject
IPN triangulation of GRB 220320A
Event
GRB 220320A
Date
2022-03-23T12:27:20Z (5 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 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, and C. Wilson-Hodge
on behalf of the Fermi GBM 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 bright, long-duration GRB 220320A
(AstroSat-CZTI detection: Gopalakrishnan et al., GCN Circ. 31779Loading...
 
 )
was detected by Fermi (GBM trigger 669443999), Konus-Wind,
INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), BepiColombo (MGNS),
CALET (CGBM), and AstroSat (CZTI) at about 16794 s UT (04:39:54).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
    94.150 (06h 16m 36s) -55.909 (-55d 54' 31")
  Corners:
    94.226 (06h 16m 54s) -55.949 (-55d 56' 58")
    94.048 (06h 16m 12s) -55.915 (-55d 54' 54")
    94.074 (06h 16m 18s) -55.868 (-55d 52' 04")
    94.252 (06h 17m 00s) -55.902 (-55d 54' 08")
  ---------------------------------------------
The error box area is 19 sq. arcmin, and its maximum
dimension is 7 arcmin (the minimum one is 3 arcmin).
The Sun distance was 92 deg.

This box may be improved.

The IPN localization is consistent with, but reduces the area of, the
Fermi GBM final position.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB220320_T16796/IPN

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