TITLE:   GCN CIRCULAR
NUMBER:  35554
SUBJECT: IPN triangulation of GRB 240112A (long)
DATE:    24/01/17 14:46:49 GMT
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 HEND/Mars Odyssey team,

A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team,

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

and

W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,
and A.S. Gardner on on behalf of the GRS-Odyssey GRB team,
report:

The long-duration GRB 240112A
(GECAM-B detection: Wang and Xiong, GCN 35520)
has been detected by Konus-Wind, INTEGRAL (SPI-ACS),
GECAM-B, and Mars-Odyssey (HEND), so far, 
at about 20482 s UT (05:41:22).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  289.407 (19h 17m 38s) +21.459 (+21d 27' 31")
 Corners:
  291.869 (19h 27m 29s) +20.713 (+20d 42' 47")
  287.138 (19h 08m 33s) +22.071 (+22d 04' 17")
  286.938 (19h 07m 45s) +22.067 (+22d 04' 02")
  291.666 (19h 26m 40s) +20.731 (+20d 43' 50")
 ---------------------------------------------
The error box area is 809 sq. arcmin, and its maximum
dimension is 4.8 deg (the minimum one is 3 arcmin).
The Sun distance was 42 deg.

The IPN localization is consistent with, but reduces
the area of, the GECAM-B localization (GCN 35520).
The position of SGR 1935+2154 is outside the box.

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB240112_T20481/IPN

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