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GCN Circular 14103

Subject

IPN Triangulation of GRB 121225B

Date

2012-12-26T15:28:17Z (12 years ago)

From

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

K. Hurley and J. Goldsten, on behalf of MESSENGER GRNS GRB team,

S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,
D. Svinkin, and T. Cline on behalf of the Konus-Wind team,

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

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

The long-duration GRB 121225B has been observed by Fermi (GBM: trigger 
363381140, Tierney, GCN Circ. 14102Not found
 
 
; LAT: Kocevski et al., GCN Circ. 
14101Not found
 
 
), Konus-Wind, INTEGRAL (SPI-ACS), and MESSENGER (GRNS), so far, at 
about 36054 s UT (10:00:54).

We have triangulated it to a preliminary, 3 sigma error box whose
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   308.913 (20h 35m 39s) -34.355 (-34d 21' 18")
  Corners:
   308.749 (20h 35m 00s) -30.606 (-30d 36' 21")
   308.950 (20h 35m 48s) -30.654 (-30d 39' 14")
   308.778 (20h 35m 07s) -38.039 (-38d 02' 19")
   308.567 (20h 34m 16s) -37.991 (-37d 59' 27")
  ---------------------------------------------
The error box area is 1.3 sq. deg, and its maximum dimension is 7.4 deg 
(the minimum one is 0.2 deg, the minimum annulus width is 0.2 deg).

This box can be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB121225_T36066/IPN/