GCN Circular 1931

K. Hurley and T. Cline, on behalf of the Ulysses and Mars Odyssey GRB teams,

I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak and A. Sanin,
on behalf of the HEND/Odyssey GRB team,

W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr,
on behalf of the GRS/Odyssey GRB team, and

D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W. Hajdas, 
and A. Zehnder, on behalf of the RHESSI GRB team, report:

Ulysses, Mars Odyssey (HEND and GRS), and RHESSI observed this GRB 
(GCN 1930
Not found
 
 
) at 13102 seconds (Earth-crossing time).

We have triangulated it to two preliminary, 3 sigma error boxes whose 
approximate areas are 40 sq. arcmin. each and whose coordinates are:

    RA(2000)                              DEC(2000)
 ERROR BOX CENTER:  21 h 53 m 27.24 s    -10 o 52 '  14.24 " 
 ERROR BOX CORNER 1: 21 h 53 m 24.33 s    -10 o 50 '   7.63 " 
 ERROR BOX CORNER 2: 21 h 54 m  0.73 s    -10 o 51 '  12.32 " 
 ERROR BOX CORNER 3: 21 h 52 m 53.73 s    -10 o 53 '  17.74 " 
 ERROR BOX CORNER 4: 21 h 53 m 30.13 s    -10 o 54 '  20.87 " 

and

 ERROR BOX CENTER:  21 h 4 m 14.52 s     -74 o 21 ' 56.53 "
 ERROR BOX CORNER 1:  21 h  3 m 55.15 s    -74 o 23 '  44.85 "  
 ERROR BOX CORNER 2:  21 h  6 m  7.04 s    -74 o 25 '  19.24 "     
 ERROR BOX CORNER 3:  21 h  2 m 22.89 s    -74 o 18 '  28.49 "    
 ERROR BOX CORNER 4:  21 h  4 m 33.81 s    -74 o 20 '   8.06 " 

These error boxes lie approximately 18 and 71 degrees from the
Sun, respectively.  They can be improved, and, although neither
is Earth-blocked or Mars-blocked, it should eventually be
possible to determine which is the correct one.

A GCN socket message will be issued shortly.