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GCN Circular 28291

Subject
IPN triangulation of GRB 200826A (short/bright)
Date
2020-08-26T21:28:52Z (4 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@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,

D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia,
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 short-duration, bright GRB 200826A
(Fermi-GBM detection: The Fermi GBM Team, GCN Circ. 28284;
Mangan et al., GCN Circ. 28287;
BALROG localization: Kunzweiler et al., GCN Circ. 28286;
AstroSat-CZTI detection: Gupta et al.,  GCN Circ. 28288;
AGILE detection: Pittori et al.,  GCN Circ. 28289)
has been detected by Fermi (GBM trigger 620108997),
Konus-Wind, INTEGRAL (SPI-ACS), AstroSat (CZTI),
AGILE (SA), and Mars-Odyssey (HEND),
so far, at about 16193 s UT (04:29:53).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
     6.817 (00h 27m 16s) +34.038 (+34d 02' 18")
  Corners:
     7.081 (00h 28m 19s) +34.000 (+34d 00' 00")
     6.808 (00h 27m 14s) +34.222 (+34d 13' 21")
     6.553 (00h 26m 13s) +34.075 (+34d 04' 31")
     6.826 (00h 27m 18s) +33.854 (+33d 51' 14")
  ---------------------------------------------
The error box area is 288 sq. arcmin, and its maximum
dimension is 27 arcmin (the minimum one is 15 arcmin).
The Sun distance was 126 deg.

This box may be improved.

The IPN localization is consistent with, but reduces the area of, the Fermi 
RoboBA and BALROG localizations (GCN Circ. 28284 and 28286).

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200826_T16195/IPN

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