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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2239 SUBJECT: GRB030324: Further Observations of the Candidate Optical Afterglow DATE: 03/05/20 23:41:06 GMT FROM: Don Lamb at U.Chicago <lamb@oddjob.uchicago.edu> D. Q. Lamb, M. Nysewander, D. Reichart, D. G. York, R. McMillan, J. Barentine, J. Dembicky, and B. Ketzeback report on behalf of the ARC and UNC GRB teams of the FUN GRB collaboration: Using a larger sample of standard stars from Henden (GCN 1950), we measure the magnitude of the candidate optical afterglow (Lamb et al. GCNs 2139, 2140) of GRB030324 (Donaghy et al., GCN 1954, 1955) on the night of March 24 UT to be i* = 23.48 +/- 0.21 (S/N = 4.3). On May 3 UT, we obtained a further five 600-second i* images of the field of the candidate optical afterglow. We find no object at the location of the candidate optical afterglow down to the limiting magnitude of the stacked image, which is i* = 25.1 (2 sigma). We also find no object at the location of the candidate optical afterglow down to the limiting magnitude of the stacked image constructed by combining the 1200-second i* image obtained on April 5 UT (Lamb et al. GCNs 2139, 2140) and the five 600-second i* images obtained on May 3 UT, which is i* = 25.3 (2 sigma). This further rules out the possibility that the star-like object we detected on the night of March 24 UT is a variable star and places a limit on the brightness of the host galaxy of GRB030324 of i* > 25.3 (2 sigma), if the object is the optical afterglow of GRB030324.
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