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GCN Circular 32865

Subject
IPN triangulation of GRB 221025A (short)
Date
2022-10-27T14:34:24Z (2 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team,

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

E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
report:

The short-duration GRB 221025A
(Fermi-LAT detection: Arimoto et al., GCN Circ. 32843;
Fermi-GBM detection: Wood and Meegan, GCN Circ. 32851;
AstroSat-CZTI detection: Gopalakrishnan et al., GCN Circ. 32853)
was detected by Fermi (GBM trigger 688352303), INTEGRAL (SPI-ACS),
Konus-Wind, AstroSat (CZTI), and GECAM-B (trigger tn221025_005818_fb)
at about 3498 s UT (00:58:18).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   134.373 (08h 57m 29s) +13.068 (+13d 04' 07")
  Corners:
   133.601 (08h 54m 24s) +10.772 (+10d 46' 20")
   133.259 (08h 53m 02s) +10.806 (+10d 48' 20")
   135.172 (09h 00m 41s) +15.363 (+15d 21' 46")
   135.522 (09h 02m 05s) +15.330 (+15d 19' 48")
  ---------------------------------------------
The error box area is 1.6 sq. deg, and its maximum
dimension is 5.03 deg (the minimum one is 19.44 arcmin).
The Sun distance was 78 deg.

This localization may be improved.

The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM final localization (glg_healpix_all_bn221025040_v00).

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB221025_T03498/IPN/

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