[AAVSO-HEN] GRB 060105: MDM Observation

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
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TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4440
SUBJECT: GRB 060105: MDM Observation
DATE:    06/01/06 13:18:06 GMT
FROM:    Jules Halpern at Columbia U.  <jules at astro.columbia.edu>

N. Zimmerman, S. Tyagi, & J. P. Halpern (Columbia U.) report:

"Using the MDM 2.4m outfitted with RETROCAM, we have obtained an upper
limit on the SDSS r-band magnitude of GRB 060105 as of Jan. 6 02:00 UT, or
19 hours after the burst. The sum of eight 5-minute exposures reveals no
new source within the refined XRT error circle (Godet et al,. GCN 4433) to
a limit of r = 21.0, as calibrated with Sloan standard stars."