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GCN Circular 29909

IPN triangulation of GRB 210424B (short/hard)
2021-04-28T16:20:26Z (3 years ago)
Dmitry Svinkin at Ioffe Institute <>
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, D. Frederiks, A. Ridnaia,
A. Lysenko, and T. Cline on behalf of the Konus-Wind team,

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


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

The short-duration, very bright GRB 210424B
was detected by Konus-Wind, INTEGRAL (SPI-ACS), CALET (GBM),
and Mars-Odyssey (HEND) at about 28916 s UT (08:01:56).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
   RA(2000), deg                 Dec(2000), deg
   284.716 (18h 58m 52s) +16.172 (+16d 10' 20")
   284.892 (18h 59m 34s) +16.078 (+16d 04' 42")
   284.882 (18h 59m 32s) +16.153 (+16d 09' 09")
   284.540 (18h 58m 10s) +16.265 (+16d 15' 55")
   284.550 (18h 58m 12s) +16.191 (+16d 11' 28")
The error box area is 84 sq. arcmin, and its maximum
dimension is 23 arcmin (the minimum one is 4 arcmin).
The Sun distance was 102 deg.

This box may be improved.

A triangulation map is posted at

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