[vsnet-grb-info 20810] IPN Triangulation of GRB 180703B

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22908
SUBJECT: IPN Triangulation of GRB 180703B
DATE:    18/07/06 05:14:31 GMT
FROM:    Anna Kozlova at Ioffe Institute  <ann_kozlova at mail.ioffe.ru>

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,

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

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,

S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer,
on behalf of the Swift-BAT 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 GRB 180703B
(Fermi-LAT detection: Racusin et al., GCN Circ. 22884;
CGBM detection: Takahasi et al., GCN Circ. 22888;
Fermi-GBM detection: Poolakkil and Meegan, GCN Circ. 22897)
was detected by Fermi (GBM trigger 552350816), Konus-Wind,
INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), CALET (CGBM),
and Swift (BAT), at about 82009 s UT (22:46:49).
The burst was outside the coded field of view of the BAT.

We have triangulated it to a Konus-HEND annulus centered at
RA(2000)=132.436 deg (08h 49m 45s)  Dec(2000)=+22.998 deg (+22d 59' 54"),
whose radius is 62.605 +/- 0.326 deg (3 sigma).

The LAT position reported by Racusin et al. (GCN Circ. 22884)
is consistent with the annulus. The annulus combined with
the LAT (90 % containment, statistical-only) error circle
gives the following error box:
---------------------------------------------
  RA(2000), deg  Dec(2000), deg
---------------------------------------------
Center:
     97.0594 -29.7187
Corners:
     96.9223 -29.8774
     97.2925 -30.1165
     97.1962 -29.5599
     96.5548 -29.6361
---------------------------------------------
The error box area is 894.7 sq. arcmin
(a factor of 2 smaller than that of the LAT error circle).

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB180703_T82008/IPN