TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  507
SUBJECT: IPN error boxes for GRB991221
DATE:    99/12/22 23:13:42 GMT
FROM:    Kevin Hurley at UCBerkeley/SSL  <khurley@sunspot.ssl.berkeley.edu>

K. Hurley, on behalf of the Ulysses GRB team, T. Cline, on behalf
of the NEAR and KONUS GRB teams, and E. Mazets and S. Golenetskii,
on behalf of the KONUS GRB team, report:

Ulysses, KONUS-WIND, and NEAR observed a relatively bright
(25-100 keV fluence ~1.3 x 10^-5 erg/cm^2), ~60 s long gamma-ray
burst at 38196 s U.T. on December 21 1999.  Triangulation gives
two possible preliminary ~190 sq. arcmin. error boxes whose corners
are at:

  RA(2000)                  DEC(2000)               
14 h 43 m 59.59 s    -42 o 46 '  36.00 "     
14 h 44 m 12.73 s    -43 o 15 '  32.42 "     
14 h 43 m 10.52 s    -42 o 15 '  27.97 "     
14 h 43 m 25.10 s    -42 o 45 '  15.18 " 

             and 
   
  RA(2000)                  DEC(2000)
13 h 54 m  7.11 s    -11 o 41 '  32.68 "
13 h 52 m 58.96 s    -11 o 17 '  47.08 "
13 h 55 m  0.20 s    -12 o 11 '  15.04 "
13 h 53 m 50.77 s    -11 o 46 '  37.87 "

Receipt of the full KONUS data set tomorrow should allow us
to resolve the ambiguity between the two.  Further refinement
of the error boxes is also possible.