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GCN Circular 16184

Subject
IPN Triangulation of GRB 140428B (short/hard)
Date
2014-04-29T19:10:53Z (10 years ago)
From
Valentin Pal'shin at Ioffe Inst <val@mail.ioffe.ru>
S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and
T. Cline, on behalf of the Konus-Wind team,

K. Hurley, on behalf of the Interplanetary Network,

I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin,
on behalf of the HEND-Odyssey GRB team,

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

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

The short-duration, hard spectrum GRB 140428B has been observed by
Fermi (GBM: trigger 420414281), INTEGRAL (SPI-ACS), Konus-Wind, and Mars 
Odyssey (HEND), so far, at about 78278 s UT (21:44:38).

We have triangulated it to a preliminary, 3 sigma error box whose
coordinates are:
   ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
     2.006 (00h 08m 01s) +68.172 (+68d 10' 20")
  Corners:
     6.132 (00h 24m 32s) +68.636 (+68d 38' 09")
     2.619 (00h 10m 29s) +68.455 (+68d 27' 18")
   358.176 (23h 52m 42s) +67.601 (+67d 36' 04")
     1.415 (00h 05m 40s) +67.887 (+67d 53' 13")
  ---------------------------------------------
The error box area is 0.608 sq. deg, and its maximum dimension is 3.14
deg (the minimum one is 18 arcmin).

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB140428_T78275/IPN/

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