[vsolj-alert 553] MKN501 cont

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

From mattox@gamma.bu.edu Fri Mar  3 07:10 JST 2000
Date: Thu, 2 Mar 2000 17:08:54 -0500
From: John Mattox <mattox@gamma.bu.edu>
To: webt_distribution@gamma.bu.edu
Cc: Chiharu TANIHATA <tanihata@astro.isas.ac.jp>,
        Tadayuki Takahashi <takahasi@astro.isas.ac.jp>, rmujica@inaoep.mx
Subject: Stefan's note on WEBT campaigns
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----- Forwarded message from Stefan Wagner <S.Wagner@lsw.uni-heidelberg.de> --
                           IDV campaign
                      *********************

As has been announced by John Mattox a long while ago, we will have
a campaign on simultaneous radio- and optical monitoring on four
Intraday variables in March 2000. The aim is to search for correlated
variations at radio and optical frequencies to settle this important
question. 
Continuous radio coverage is organized by the VLBI group at the MPI
for Radioastronomy in Bonn, using the 100m telescope in Bonn continuously
and four other radio telescopes part-time. Radio observations will cover
the entire wavelength range from 1 mm (IRAM, Pico Veleta) to 92 cm (NFRA).
Optical observations are organized by Stefan Wagner. We have arranged
for continuous 24h coverage using several telescopes in Europe, North
America, and Asia.
Because of weather uncertainty (March is not the best season in any of
the places) we strongly encourage additional observations. 
The main target is 0716+714. A secondary target is 0954+65. We focus
on northern sources from the S5 sample to guarantee 24h coverage
from Effelsberg, where all the sources are circumpolar. Some optical
telescopes have problems observing sources of high declinations, and
may hence not be able to observe 0716+714 and 0954+65 all night. We
will hence include 1749+71 and 2007+77 as secondary targets as well.
All of them are known to vary on Intraday-time scales, all are brighter
than 17 at the moment (observations from Feb, 29 on Calar Alto).
Finding charts are given on:
http://vsnet.lsw.uni-heidelberg.de/projects/extragalactic/charts.html
Further information on 0716+714 is given on:
http://vsnet.lsw.uni-heidelberg.de/~swagner/0716-march2000.html

The campaign starts today, March 1 with observations at three
telescopes and will have full coverage at radio- and optical
wavelengths between March 8 and March 24. From March 24 to 
April, 1 observations will continue on several telescopes with
a possible modification of the source list. Radio observations
will be performed if IDV is detected in the two weeks of dense
coverage.
Interested observers are strongly encouraged to let us know
(S.Wagner@lsw.uni-heidelberg.de) if they can contribute. 
We plan to produce a continuous light-curve which shall be
published as a paper by all people who contribute scientifically
useful observations.
We are prepared to carry out the photometry in a homogeneous fashion
of all data, provided they are de-biased and flat-fielded. Reduced
photometry is also welcome. We will use this opportunity to test a 
new webt-format for reduced photometry, currently put together by 
Gino Tosti. Further information will be distributed at the end of 
the campaign.

                           MRK 501
                     ******************

We want to announce a campaign to obtain simultaneous optical, X-ray
and TeV coverage of Mrk 501. This object is continuously observed between 
today, March 1 and March 10 by ASCA. This is the first out of several
long-looks with ASCA during ASCA AO8 which are intended to study
temporal variations of bright Blazars with a coverage similar to
the Mrk 421 campaign in 1998. The PI of the ASCA observations is
Tad Takahashi.

Details on the campaign are described in
http://vsnet.lsw.uni-heidelberg.de/~swagner/obs-campaign.html

We encourage observations of Mrk 501 during this epoch.
We plan to produce a continuous light-curve which shall be
published as a paper by all people who contribute scientifically
useful observations.
We are prepared to carry out the photometry in a homogeneous fashion
of all data, provided they are de-biased and flat-fielded. Reduced
photometry is also welcome. Because of the significant effect of the
host galaxy we need detailed information on the photometric 
measurements in these cases.

----------------------------------------------------------------------
Stefan Wagner                                   Phone: +49-6221-509212
Landessternwarte Heidelberg-Koenigstuhl         Fax:   +49-6221-509202
69117 Heidelberg                     
Germany                           Email: swagner@lsw.uni-heidelberg.de
----------------------------------------------------------------------

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