[Aavso-photometry] Reporting CCD fainter-thans

[Aaron Price]

> If you would like to report a fainter-than based on a CCD observation, you can continue to 
>report the faintest comparison star you see on the chart. That is a safe and effective 
>method. However, if you think your CCD image goes much deeper than this then you can choose 
>to instead report the magnitude and uncertainty of any star in the field (as measured with 
>our comparison stars) as long as the star has an SNR>=10. If you do this, it is very 
>important that you report an accurate uncertainty measurement. So please take care with it.

I think I should clarify one thing which all current observers know, but may confuse brand new 
observers who have never reported a fainter-than before. The reported magnitude should be 
flagged as a "fainter-than" and not reported as the magnitude of the variable star. Here is an 
example in the Extended Format:

#TYPE=EXTENDED
#OBSCODE=TST01
#SOFTWARE=GCX 2.0
#DELIM=,
#DATE=JD
#NAME,DATE,MAG,MERR,FILT,TRANS,MTYPE,CNAME,CMAG,KNAME,KMAG,AMASS,GROUP,CHART,NOTES
SS CYG,2450702.1234,<11.235,0.003,B,NO,ABS,ENSEMBLE,na,105,10.593,1.561,1,070613,na

Note the fainter-than symbol in the "MAG" field.

Aaron