TITLE:   GCN CIRCULAR
NUMBER:  26635
SUBJECT: IPN triangulation of GRB 200101A
DATE:    20/01/03 17:19:30 GMT
FROM:    Anna Kozlova at Ioffe Institute  <ann_kozlova@mail.ioffe.ru>

K. Hurley, on behalf of the IPN,

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

A. Ridnaia, 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, and

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

The long-duration, extremely bright GRB 200101A
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 26624;
Veres and Meegan, GCN Circ. 26627;
BALROG localization: Kunzweiler et al., GCN Circ. 26625;
AstroSat CZTI detection: Gaikwad et al., GCN Circ. 26632)
was detected by Konus-Wind, Fermi (GBM trigger 599603971),
Mars-Odyssey (HEND), and AstroSat(CZTI) at about 74366 s UT (20:39:26).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  258.995 (17h 15m 59s) -32.304 (-32d 18' 14")
 Corners:
  259.549 (17h 18m 12s) -31.755 (-31d 45' 20")
  258.488 (17h 13m 57s) -33.470 (-33d 28' 11")
  258.436 (17h 13m 45s) -32.806 (-32d 48' 22")
  259.506 (17h 18m 01s) -30.953 (-30d 57' 11")
 ---------------------------------------------
The error box area is about 2611 sq. arcmin, and its maximum
dimension is 2.7 deg (the minimum one is 21.8 arcmin).
The Sun distance was about 21 deg.

This box may be improved.

The IPN localization is consistent with, but reduces the area of, the
Fermi-GBM one.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200101_T74367/IPN/

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