[vsnet-obs 43017] vsnet-obs 43013 reformat

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

SN2002fk  20030113.256  166R  DPr

>Also, I notice observers using terms like 162CR for the magnitude. 
>Posting instructions indicate that "C" stands for "clear filter". "R"
>is obviously for the "red" band filter. How can one observe with the
>clear and red filters at the same time? Are people using "C" to
>indicate flat field correction? Thanks.

"CR" means that the imaging was made with clear filter or without
filter, and the magnitude estimate was done with respect to the red
magnitudes of the field reference stars (such as "rmag" in USNO-A
catalogs).  The field stars often have red colors, so the red
magnitudes of these stars are smaller than in V or visual band by one 
magnitude or more. 

Best wishes,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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