TITLE:   GCN CIRCULAR
NUMBER:  27367
SUBJECT: IPN triangulation of GRB 200307A (short)
DATE:    20/03/11 21:19:58 GMT
FROM:    Anna Ridnaia at Ioffe Institute  <ridnaia@mail.ioffe.ru>

A. Ridnaia, D. Svinkin, and K. Hurley, on behalf of the IPN,

A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
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, H. Krimm, and D. Palmer,
on behalf of the Swift-BAT team, report:

The short-duration GRB 200307A (The Fermi GBM team,
GCN Circ. 27344; Goldstein et al., GCN Circ. 27356) was detected
by Fermi (GBM trigger 605309224), INTEGRAL (SPI-ACS), and
Swift (BAT), at about 77219 s UT (21:26:59).
The burst was outside the coded field of view of the BAT.

We have triangulated this GRB to a GBM-INTEGRAL annulus centered at
RA(2000)=81.577 deg (05h 26m 18s)  Dec(2000)=-38.418 deg (-38d 25' 05"),
whose radius is 32.263 +/- 3.868 deg (3 sigma).

The IPN localization is consistent with, but reduces the area of, the
joint Fermi-GBM/Swift-BAT one (GCN Circ. 27356).

This localization may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200307_T77219/IPN/