TITLE:   GCN CIRCULAR
NUMBER:  23449
SUBJECT: IPN Triangulation of GRB 181121A (short)
DATE:    18/11/25 18:09:33 GMT
FROM:    Anna Kozlova at Ioffe Institute  <ann_kozlova@mail.ioffe.ru>

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

K. Hurley, on behalf of the IPN,

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

and A. Ursi, N. Parmiggiani, F. Verrecchia, A. Bulgarelli,
A. Trois, M. Marisaldi, C. Pittori, M. Tavani, Y. Evangelista,
I. Donnarumma, M. Cardillo, G. Piano, G. Minervini, A. Argan,
F. Lucarelli, A. Zoli, V. Fioretti, F. Fuschino, M. Pilia,
F. Longo, A. Giuliani on behalf of the AGILE team report:

The short-duration GRB 181121A (Ursi et al., GCN Circ. 23429) was
detected by Konus-Wind, INTEGRAL (SPI-ACS), and AGILE (MCAL), at
about 74617 s UT (20:43:37).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
   14.424 (00h 57m 42s) -11.977 (-11d 58' 38")
 Corners:
   11.772 (00h 47m 05s)  -9.257 ( -9d 15' 24")
   13.883 (00h 55m 32s) -11.751 (-11d 45' 05")
   17.495 (01h 09m 59s) -14.686 (-14d 41' 10")
   14.969 (00h 59m 53s) -12.200 (-12d 12' 00")
 ---------------------------------------------
The error box area is 1.6 sq. deg, and its maximum
dimension is 7.8 deg (the minimum one is 29 arcmin).
The Sun distance was 126 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB181121_T74619/IPN

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