GCN Circular #31895
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,
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT 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:
A short-duration, soft GRB 220406A
was detected by Konus-Wind, INTEGRAL (SPI-ACS),
Mars-Odyssey (HEND), and Swift (BAT) at about 1661 s UT (00:27:41).
The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
324.994 (21h 39m 59s) +64.925 (+64d 55' 31")
Corners:
330.496 (22h 01m 59s) +64.859 (+64d 51' 31")
319.682 (21h 18m 44s) +64.833 (+64d 49' 59")
319.519 (21h 18m 04s) +64.773 (+64d 46' 21")
330.308 (22h 01m 14s) +64.812 (+64d 48' 43")
---------------------------------------------
The error box area is 882 sq. arcmin, and its maximum
dimension is 4.7 deg (the minimum one is 3 arcmin).
The Sun distance was 66 deg.
This box may be improved.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB220406_T01660/IPN
The time history and spectrum will be given in forthcoming GCN Circulars.
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