Columbia University Astronomy and 
Astrophysics
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 
http://www.www.astro.lsa.umich.edu/grb/000630

This message may be cited."

Jules Halpern
jules@astro.columbia.edu
John Thorstensen
thorsten@dartmouth.edu
Columbia University Astronomy and Astrophysics,
Dartmouth College Physics and Astronomy, and MDM Observatory


MDM Observatory