BVRI data on N Sgr 2012 No. 4

So, I've been taking filtered BVRI on PNV J18202726-2744263 (thread: http://www.aavso.org/new-bright-nova-sgr-pnv-j18202726-2744263 [1]) in BVRI with standard Johnson filters from Sierra Stars.

Now since there are no I and R comp stars in the field, I'm trying to use VPHOT to create a time series to compare them. It certainly looks like I have something there. I'd like to "follow it down" as a project for myself, and possibly track it down to limiting mag for SSO's 0.61m.

In any event, I'd like to better calibrate my data, so that I'm not wasting my time on this. I guess I'm trying to find/create a V-I and I-R set for this field.

I see that I'm a newbie here, and I'm using this as a good path in.

Jason