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GCN Circular 37078

Subject

Improved IPN triangulation of GRB 240802A / EP 240802a

Date

2024-08-06T16:49:43Z (a month ago)

From

Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>

Via

Web form

A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the HEND/Mars Odyssey team,

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

E. Burns, on behalf of the IPN,

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

G. Waratkar, V. Jethwani, J.Joshi, V. Bhalerao, D. Bhattacharya, and S. Vadawale, 
on behalf of the Astrosat-CZTI 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:

Using the Mars-Odyssey (HEND) data we have improved
the previous IPN error box (Svinkin et al., GCN 37026Not found
 
 
).

The coordinates of the updated 3 sigma error box are:

  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   287.477 (19h 09m 54s)  -1.718 ( -1d 43' 05")
  Corners:
   285.131 (19h 00m 31s)  +2.050 ( +2d 03' 01")
   285.257 (19h 01m 02s)  +2.088 ( +2d 05' 15")
   289.523 (19h 18m 05s)  -5.648 ( -5d 38' 51")
   289.393 (19h 17m 34s)  -5.668 ( -5d 40' 03")
  ---------------------------------------------
The error box area is 1.11 sq. deg, and its maximum
dimension is 8.9 deg (the minimum one is 7.6 arcmin).
The Sun distance was 146 deg.

The IPN localization may be further improved.

The EP240802a localization is inside the improved box.

Updated triangulation map and HEALPix FITS files are posted at
http://www.ioffe.ru/LEA/GRBs/GRB240802_T38048/IPN/
The HEALPix triangulation map is the multi-order HEALPix in units of probability density.

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