Columbia University Astronomy and 

MDM Observatory GRB Team

GRB 000301C (4.3x4.3 arcmin)

1.3m CCD

Comparison Stars A-D from GCN #573

GCN Circular #578: GRB 000301C, Optical Observation
J. P. Halpern, N. Mirabal, & S. Lawrence (Columbia U.) report
on behalf of the MDM Observatory GRB follow-up team:

"We imaged the location of GRB 000301C as determined by the
intersection of the RXTE All-Sky Monitor error box and the
Ulysses/NEAR annulus (Smith, Hurley, & Cline, GCN #568) 
in the R band on March 3.51 UT using the MDM 1.3m telescope.
The optical transient found by Fynbo et al. (GCN #570,576)
is measured at R = 20.24 +/- 0.05, referenced to the comparison
stars of Garnavich et al. (GCN #573).  This is consistent
with measurements by Garnavich et al. and Veillet (GCN #575)
that were obtained contemporaneously.  The implied power-law
decay index is still rather uncertain.  Using our magnitude
and that measured by Fynbo et al. (GCN #576), we find 
alpha = -1.56 +/- 0.30.  This predicts R = 20.90 +/- 0.18
on March 4.51 UT.

We measure the position of the optical transient to be
(J2000) RA 16:20:18.550, Dec +29:26:35.96 relative to 
30 USNO-A2.0 stars having a dispersion of 0".31 in radius.

CCD images are posted at

This message may be cited."

1.3m CCD

Jules Halpern
Nestor Mirabal
Steve Lawrence
Columbia University Astronomy and Astrophysics, and MDM Observatory

MDM Observatory