Afterglow of the Gamma Ray
A source at the position of the GRB afterglow is marginally detected, but because of its faintness, it is difficult to separate a possible point source from the underlying fuzz. Differential PSF-fitting photometry relative to the bright stars in the field yields J = 21.9 +/- 0.1 for the source at the position of the GRB afterglow. Because of the marginal detection, this should be viewed as an upper limit.
Two other sources are detected near the GRB position. One bright source is located 0.8"S and 2.0"E of the GRB with J = 19.98 +/- 0.04. This object may be the core of the GRB host galaxy, but it is not clearly resolved -- it might be a foreground star. The other source (the "blob") located 1.6"S and 2.6" E of the GRB is clearly detected at J = 21.57 +/- 0.07, and is possibly extended.