Multifrequency monitoring of the blazar 0716+714 during the GASP-WEBT-AGILE campaign of 2007
Journal
Date Issued
2008
Author(s)
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Larionov, V. M.
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Kurtanidze, O. M.
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Nilsson, K.
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Aller, M. F.
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Tornikoski, M.
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Volvach, A.
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Aller, H. D.
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Arkharov, A. A.
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Bach, U.
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Beltrame, P.
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Bhatta, G.
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Böttcher, M.
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Calcidese, P.
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Carosati, D.
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Castro-Tirado, A. J.
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da Rio, D.
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•
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Forné, E.
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Hagen-Thorn, V. A.
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Heidt, J.
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Hiriart, D.
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Jelínek, M.
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Kimeridze, G. N.
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Konstantinova, T. S.
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Kopatskaya, E. N.
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•
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Ligustri, R.
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Lindfors, E.
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Lähteenmäki, A.
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Marilli, E.
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Nieppola, E.
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Nikolashvili, M. G.
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Pasanen, M.
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Ragozzine, B.
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Ros, J. A.
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Sigua, L. A.
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Sorcia, M.
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Takalo, L. O.
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Turchetti, R.
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Uckert, K.
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Webb, J. R.
Abstract
Aims: Since the CGRO operation in 1991-2000, one of the primary unresolved questions about the blazar γ-ray emission has been its possible correlation with the low-energy (in particular optical) emission. To help answer this problem, the Whole Earth Blazar Telescope (WEBT) consortium has organized the GLAST-AGILE Support Program (GASP) to provide the optical-to-radio monitoring data to be compared with the γ-ray detections by the AGILE and GLAST satellites. This new WEBT project started in early September 2007, just before a strong γ-ray detection of 0716+714 by AGILE.
Methods: We present the GASP-WEBT optical and radio light curves of this blazar obtained in July-November 2007, about various AGILE pointings at the source. We construct NIR-to-UV spectral energy distributions (SEDs), by assembling GASP-WEBT data together with UV data from the Swift ToO observations of late October.
Results: We observe a contemporaneous optical-radio outburst, which is a rare and interesting phenomenon in blazars. The shape of the SEDs during the outburst appears peculiarly wavy because of an optical excess and a UV drop-and-rise. The optical light curve is well sampled during the AGILE pointings, showing prominent and sharp flares. A future cross-correlation analysis of the optical and AGILE data will shed light on the expected relationship between these flares and the γ-ray events.The radio-to-optical datapresented in this paper are stored in the WEBT archive; for questions regarding their availability,please contact the WEBT President Massimo Villata.
Methods: We present the GASP-WEBT optical and radio light curves of this blazar obtained in July-November 2007, about various AGILE pointings at the source. We construct NIR-to-UV spectral energy distributions (SEDs), by assembling GASP-WEBT data together with UV data from the Swift ToO observations of late October.
Results: We observe a contemporaneous optical-radio outburst, which is a rare and interesting phenomenon in blazars. The shape of the SEDs during the outburst appears peculiarly wavy because of an optical excess and a UV drop-and-rise. The optical light curve is well sampled during the AGILE pointings, showing prominent and sharp flares. A future cross-correlation analysis of the optical and AGILE data will shed light on the expected relationship between these flares and the γ-ray events.The radio-to-optical datapresented in this paper are stored in the WEBT archive; for questions regarding their availability,please contact the WEBT President Massimo Villata.
Volume
481
Issue
2
Start page
L79
Issn Identifier
0004-6361
Ads BibCode
2008A&A...481L..79V
Rights
open.access
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