TITLE:   GCN CIRCULAR
NUMBER:  45627
SUBJECT: IPN triangulation of GRB 260810A
DATE:    26/09/18 11:28:54 GMT
FROM:    Valentina Panteleeva at Ioffe Institute <panteleevav228@gmail.com>

A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the HEND/Mars Odyssey team,

V. Panteleeva, D. Frederiks, A. Lysenko, A. Ridnaia, D. Svinkin
and T. Cline on behalf of the Konus-Wind team,

E. Burns on behalf of the IPN,

A. Goyal, A. Arya, M. Tembhurnikar, G. Waratkar, V. Bhalerao,
D. Bhattacharya, and S. Vadawale, on behalf of the Astrosat-CZTI team,

C. Wang (IHEP), S. Xiong (IHEP), S. Zhang (IHEP), J. Wei (NAOC),
and B. Cordier (CEA) on behalf of the SVOM-GRM team,

C. Wang (IHEP), S. Xiong (IHEP), and S. Zhang (IHEP)
on behalf of the Insight-HXMT team,

and

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

The long-duration GRB 260810A
(AstroSat-CZTI detection: Arya et al., GCN 45363;
Glowbug detection: Cheung et al., GCN 45365;
Insight-HXMT-HE detection: Yu et al., GCN 45392;
SVOM-GRM observation: Guo et  al., GCN 45402)
was detected by AstroSat (CZTI), Glowbug, Insight-HXMT (HE), 
SVOM (GRM), Konus-Wind and Mars-Odyssey (HEND) 
at about 68983 s UT (19:09:43). 

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  244.235 (16h 16m 56s)  +3.614 ( +3d 36' 51")
 Corners:
  245.133 (16h 20m 32s)  +4.408 ( +4d 24' 28")
  243.441 (16h 13m 46s)  +2.980 ( +2d 58' 49")
  243.326 (16h 13m 18s)  +2.763 ( +2d 45' 46")
  245.020 (16h 20m 05s)  +4.208 ( +4d 12' 29")
 ---------------------------------------------
The error box area is 680 sq. arcmin, and its maximum
dimension is 2.4 deg (the minimum one is 5 arcmin).
The Sun distance was ~141 deg.

This localization may be improved.

A triangulation map and HEALPix FITS files are posted at
http://www.ioffe.ru/LEA/GRBs/GRB260810_T68985/IPN/
The HEALPix triangulation map is the multi-order HEALPix in units of
probability density.

The Konus-Wind time history and spectrum will be given
in a forthcoming GCN Circular.