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GCN Circular 19850

Subject

IPN Triangulation of GRB 160820A (short/hard)

Date

2016-08-23T10:40:26Z (8 years ago)

From

Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>

D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova,
and T. Cline on behalf of the Konus-Wind team,

K. Hurley, on behalf of the IPN,

V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa,
and A. Goldstein, on behalf of the Fermi GBM team,

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

and

S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer,
on behalf of the Swift-BAT team, report:

A short-duration, hard-spectrum GRB 160820A was detected by Fermi
(GBM; trigger 493386854), Konus-Wind, INTEGRAL (SPI-ACS),
and Swift (BAT) at about 42851 s UT (11:54:11).
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:
    11.338 (00h 45m 21s) +24.933 (+24d 55' 59")
  Corners:
     8.000 (00h 32m 00s) +28.159 (+28d 09' 33")
    15.644 (01h 02m 35s) +22.544 (+22d 32' 38")
    14.155 (00h 56m 37s) +21.358 (+21d 21' 28")
     6.447 (00h 25m 47s) +26.868 (+26d 52' 04")
  ---------------------------------------------
The error box area is 16.23 sq. deg, and its maximum
dimension is 9.4 deg (the minimum one is 1.82 deg).
The Sun distance was 123 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB160820_T42855/IPN/

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