Columbia University Astronomy and 
Dartmouth College 
Astronomy and Physics

MDM Observatory GRB Team

GRB 000630 Radio Candidate
MDM 2.4m (2.3x2.3 arcmin display)

2.4m R Band

2.4m I Band

GCN Circular #745: GRB 000630, Optical Observations
J. P. Halpern (Columbia U.) & J. Thorstensen (Dartmouth)
report on behalf of the MDM Observatory GRB follow-up team:

"We observed the location of the radio candidate for GRB 000630
(Berger & Frail GCN #738) in the I band on July 1.29 UT using
the MDM 2.4m telescope.  A total exposure time of 25 minutes was 
obtained in seeing of 1."5 and under non-photometric conditions.
We also obtained 15 minutes of exposure in the R band starting
on July 1.33 UT.  Upper limits at the location of the radio
candidate of I > 23.3 and R > 23.2 were obtained, referenced to
these comparisons stars as calibrated by Henden (GCN #742):

    Star       RA(2000)    Dec(2000)        R        I 
     A       14 47 01.67  +41 16 16.9     17.42    16.84
     B       14 46 59.25  +41 15 52.2     18.59    18.15

Images of this field are posted at

This message may be cited."

Jules Halpern
John Thorstensen
Columbia University Astronomy and Astrophysics,
Dartmouth College Physics and Astronomy, and MDM Observatory

MDM Observatory