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GCN Circular 18357

Subject

IPN Triangulation of GRB 150922A (short/hard)

Date

2015-09-22T21:10:23Z (9 years ago)

From

Dmitry Svinkin at Ioffe Institute <svinkin@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 IPN,

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

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

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

The short-duration, hard-spectrum GRB 150922A has been detected by 
Konus-Wind, Fermi (GBM trigger 464593053/150922234), Mars-Odyssey 
(HEND), and INTEGRAL (SPI-ACS), so far, at about 20249 s UT (05:37:29).

We have triangulated it to a preliminary, 3 sigma error box whose 
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   294.381 (19h 37m 31s)  -5.486 ( -5d 29' 10")
  Corners:
   294.315 (19h 37m 16s)  -6.116 ( -6d 06' 57")
   294.303 (19h 37m 13s)  -5.399 ( -5d 23' 56")
   294.448 (19h 37m 48s)  -4.881 ( -4d 52' 51")
   294.458 (19h 37m 50s)  -5.573 ( -5d 34' 25")
  ---------------------------------------------
The error box area is 385 sq. arcmin, and its maximum
dimension is 75 arcmin (the minimum one is 9.1 arcmin).
The Sun distance was 115 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB150922_T20250/IPN/

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