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GCN Circular 27560

Subject
IPN triangulation of GRB 200412A
Date
2020-04-12T21:20:47Z (4 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
K. Hurley, on behalf of the IPN,

I. G. Mitrofanov, D. V. Golovin, A. S. Kozyrev, M. L. Litvak,
and A. B. Sanin, on behalf of the HEND-Odyssey GRB team,

A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin,
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, and R. Starr,
on behalf of the GRS-Odyssey GRB team, report:

The long-duration GRB 200412A
(BALROG localization: Kunzweiler et al., GCN Circ. 27546;
Fermi-GBM detection: Mailyan & Hamburg, GCN Circ. 27550)
was detected by Fermi (GBM trigger 608367436), Konus-Wind,
INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND)
at about 25032 s UT (06:57:12).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  137.164 (09h 08m 39s) -39.022 (-39d 01' 20")
 Corners:
  136.598 (09h 06m 24s) -38.953 (-38d 57' 12")
  136.795 (09h 07m 11s) -39.172 (-39d 10' 21")
  137.730 (09h 10m 55s) -39.086 (-39d 05' 11")
  137.530 (09h 10m 07s) -38.870 (-38d 52' 11")
 ---------------------------------------------
The error box area is 616 sq. arcmin, and its maximum
dimension is 53 arcmin (the minimum one is 14 arcmin).
The Sun distance was 115 deg.

This box may be improved.

The localization is consistent with, but reduces
the area of, the final Fermi-GBM (GCN Circ. 27546) and
BALROG (GCN Circ. 27550) localizations.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200412_T25034/IPN/

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