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GCN Circular 31161

Subject
IPN triangulation of GRB 211130A
Date
2021-12-03T14:20:30Z (3 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,

K. Hurley, on behalf of the IPN,

A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo,
and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,

and

A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team, report:

The long-duration GRB 211130A
(Fermi GBM Final Real-time localization: The Fermi GBM team, GCN 31151Not found
 
 
;
BALROG localization: Kunzweiler et al., GCN 31152Not found
 
 
)
was detected by Fermi (GBM trigger 659978192), Konus-Wind,
INTEGRAL (SPI-ACS), and BepiColombo (MGNS) at about 54987 s UT (15:16:27).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
   21.148 (01h 24m 35s) -27.829 (-27d 49' 46")
 Corners:
   20.183 (01h 20m 44s) -27.190 (-27d 11' 25")
   20.317 (01h 21m 16s) -27.403 (-27d 24' 10")
   22.106 (01h 28m 25s) -28.433 (-28d 25' 58")
   21.973 (01h 27m 54s) -28.233 (-28d 13' 58")
 ---------------------------------------------
The error box area is 734 sq. arcmin, and its maximum
dimension is 2.1 deg (the minimum one is 6.5 arcmin).
The Sun distance was 113 deg.

This box may be improved.

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

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB211130_T54992/IPN

The time history and spectrum will be given in forthcoming GCN Circulars.