[vsnet-grb-info 26203] IPN triangulation of GRB 200826B

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28303
SUBJECT: IPN triangulation of GRB 200826B
DATE:    20/08/28 19:31:31 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin at 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 long-duration GRB 200826B
(Fermi-GBM detection: The Fermi GBM Team, GCN Circ. 28292;
Malacaria and Meegan, GCN Circ. 28298)
has been detected by Fermi (GBM trigger 620172587),
Konus-Wind, INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND),
so far, at about 79779 s UT (22:09:39).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
    ---------------------------------------------
     RA(2000), deg                 Dec(2000), deg
    ---------------------------------------------
    Center:
     153.175 (10h 12m 42s) +57.580 (+57d 34' 48")
    Corners:
     154.647 (10h 18m 35s) +58.181 (+58d 10' 52")
     153.503 (10h 14m 01s) +58.301 (+58d 18' 03")
     151.749 (10h 07m 00s) +56.954 (+56d 57' 14")
     152.864 (10h 11m 27s) +56.858 (+56d 51' 28")
    ---------------------------------------------
The error box area is 3280 sq. arcmin, and its maximum
dimension is 2.0 deg (the minimum one is 33.4 arcmin).
The Sun distance was 47 deg.

This box may be improved.

The IPN localization is consistent with, but reduces the area of, the
Fermi RoboBA localization (GCN Circ. 28292).

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200826_T79779/IPN

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