CCD photometry of blazars at Abastumani Observatory Kurtanidze, Omar M.; Nikolashvili, Maria G.; Kimeridze, Givi N. ...
Nuclear physics. Section B, Proceedings supplement,
06/2004, Letnik:
132
Journal Article
We give a brief summary of the ongoing Abastumani Active Galactic Nuclei Monitoring Program, started in May of 1997. More than 75000 frames were obtained during more than 900 nights of observation ...for about 50 target objects, among them X-ray, γ-ray and optical blazars. All observations were done in the BVRI bands using the ST-6 CCD based Photometer attached to the Newtonian focus of the 70-cm meniscus telescope.
Image reductions have been done using DaophotII. The lightcurves illustrating the activity of selected blazars in R band, namely AO 0235+164 and S4 0954+658 are presented. Most of the objects under study show light variations in optical bands over one magnitude. The largest variation was observed for AO 0235+116 - 4
m
.0 in R band.
Astron.J.132:873-882,2006 PG 1553+11 was the target of a coordinated three week multiwavelength
campaign during 2003 April and May. A significant X-ray flare was observed
during the second half of ...this campaign. Although no optical flare was recorded
during the X-ray campaign, optical observations obtained immediately prior to
the campaign displayed a higher flux than that recorded during the campaign. An
optical flare was observed a few days after the end of the X-ray campaign and
may be related to the X-ray flare. Radio observations were made at three
frequencies, with no significant changes in flux detected near the times of the
optical and X-ray flares. The spectral energy distributions and flux ratios in
different wavebands observed for this object are compared to other X-ray
selected blazars to demonstrate how PG 1553+11 is an extreme member of this
group.
We present optical R band photometry for nine X-ray Einstein Slew Survey Sample BL Lacertae objects: 1ES 0323+022, 1ES 0502+675, 1ES 0647+250, 1ES 0806+524, 1ES 1028+511, 1ES 1959+650 and 1ES ...2344+514. Two blazars 1ES 0229+200 and 1ES 0927+500 didn't show any detectable variability. They have all been observed with the ST-6 CCD camera attached to the Newtonian focus of the 70-cm meniscus telescope. These data provide optical information on sources that have been rarely observed in the optical band. Variability on long time scales within one magnitude in R band was detected for all of the observed objects except two. The largest variation was observed for 1ES 0502+675 and equals to ΔR=1
m
.07.
PG 1553+11 was the target of a coordinated three week multiwavelength campaign during 2003 April and May. A significant X-ray flare was observed during the second half of this campaign. Although no ...optical flare was recorded during the X-ray campaign, optical observations obtained immediately prior to the campaign displayed a higher flux than that recorded during the campaign. An optical flare was observed a few days after the end of the X-ray campaign and may be related to the X-ray flare. Radio observations were made at three frequencies, with no significant changes in flux detected near the times of the optical and X-ray flares. The spectral energy distributions and flux ratios in different wavebands observed for this object are compared to other X-ray selected blazars to demonstrate how PG 1553+11 is an extreme member of this group.
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