TITLE:   GCN CIRCULAR
NUMBER:  22522
SUBJECT: IPN Triangulation of GRB 180318A (long)
DATE:    18/03/20 13:08:59 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin@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,

D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova,
and T. Cline on behalf of the Konus-Wind 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 long-duration GRB 180318A has been detected by Konus-Wind,
Swift (BAT), and Mars-Odyssey (HEND), so far, at about 84000 s UT
(23:20:00).

We have triangulated it to a preliminary, 3 sigma error box whose
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   180.343 (12h 01m 22s) +33.936 (+33d 56' 09")
  Corners:
   179.707 (11h 58m 50s) +32.043 (+32d 02' 35")
   181.324 (12h 05m 18s) +35.706 (+35d 42' 23")
   180.991 (12h 03m 58s) +35.829 (+35d 49' 46")
   179.386 (11h 57m 33s) +32.164 (+32d 09' 49")
  ---------------------------------------------
The error box area is 1.16 sq. deg, and its maximum
dimension is 3.93 deg (the minimum one is 17.8 arcmin).
The Sun distance was 144 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB180318_T84002/IPN

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