[vsnet-alert 1209] (fwd) call for Blazars observation

[Taichi Kato <tkato>]

Forwarded message (via CBA list, with permission of the sender):

>From pmcgee@physics.adelaide.edu.au Tue Sep  2 20:12 JST 1997
>From: Paddy McGee <pmcgee@physics.adelaide.edu.au>
>Subject: Blazars aplenty

 Dear CBA-bods,
               This is a call for any interested parties- most likely
southerners- to assist in a non-CBA photometry programme. The objects
in question are a couple of BL Lac sources- active galactic nuclei, nice
and bright at about 13th mag.
 Specifically, they are PKS 2005-489 and PKS 2155-304. These are to be 
monitored at gamma-ray wavelengths by the CANGAROO telescope at Woomera,
South Australia, in the new moon periods Sept-Oct and Oct-Nov (at least).
There is talk also of observing another source, at about 5h RA later.
I intend to undertake simultaneous CCD photometry for at least the first
session, and maybe also the second, using a C14 and ST-6 at Woomera.
 My plan is to take time-series photometry and reduce the data
differentially. From test images I have of 2005, I expect to use 40-second
integrations with the R filter, at about 90-s intervals. Monitoring 
would be for at least a few hours each night, extending to most of the
night around new moon. 2005 can stand longer than 40-s, but suitable
comparison stars are few, and that time is chosen to avoid saturating
on one of those in particular. Alas, I do not yet have images for 2155,
but would expect something similar.
 We are looking for correlations between changes in the gamma-ray flux
and the optical- hence high-resolution time-series. 2155 at least shows
minor (less than 0.1mag) changes during a night, but can change by more
than that from day to day.If we are lucky, there will be some flaring.
 I would be pleased if anyone would be able to take occasional images of
either/both of these sources during the times mentioned. All I am looking
for is a bit of filling-in of  the gaps in my Woomera data. So, snapshots
would be useful, though it would be preferable to do at least a short
time-series to get some idea of errors. Filtered data would be best, but
unfiltered would be heartily welcomed.
 If anyone is interested, please e-mail me. I would supply co-ords,
charts, etc, as required. Data reduction need only be differential, but if 
people are able to supply transformation equations for their data as well,
then you beaut. (Times with heliocentric correction as well?). Also, please
could you let me know CCD used, fields-of-view, telescope aperture?
 As for credentials, I have supplied data for campaigns on Men 1, V803 Cen
and HP Lib. Certainly a trickle compared with other peolpe's flows, but
something at least.

 Regards,
         Paddy McGee


 pmcgee@physics.adelaide.edu.au
 http://vsnet.physics.adelaide.edu.au/~pmcgee

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