TITLE: GCN GRB OBSERVATION REPORT NUMBER: 701 SUBJECT: GRB 000301C: Further Late-Time HST/STIS observations DATE: 00/06/13 23:06:57 GMT FROM: Andrew S. Fruchter at STScI A. Fruchter, M. Metzger and L. Petro report for a larger collaboration: The field of GRB 000301c was reobserved by the Hubble Space Telescope using the STIS camera in open (50CCD) mode on the 19 April 2000. The optical transient is still visible with an R magnitude of 27.9 +/- 0.15, where the error is dominated by uncertainties in the calibration of STIS and the need to assume the shape of the spectrum across the wide bandpass of the detector. The OT therefore is continuing the steep decline reported in the previous GCN and remains consistent with the late-time power-law reported in Rhoads and Fruchter (astro-ph/0004057). We find no evidence of a host galaxy underlying the GRB, to a magnitude of at least 28.5. We believe the apparently extended emission reported in our previous GCN is due to substantial, and larger than expected, variability in the PSF. Although we have not yet been able to fully reproduce the emission about the point source in our 3 April 2000 observations, we suspect this is due to very rapid variability in the PSF. Further analysis of our data has now shown residuals in PSF subtraction comparable in magnitude to that seen in the 3 April observation, even when using PSFs from the same star taken in quick succession.