OCRA-p observations V407 Cyg at 30 GHz
Following from the Fermi announcement of gamma rays potentially associated with V407 Cyg, the OCRA collaboration made a series of measurements of the 30GHz flux density of the source between 24 March and 3 October 2010. We announced our initial detections on 25 March 2010, and the complete dataset on 3 October 2010.
We have made the measured flux densities available to download. The file includes the Modified Julian Day Number of the observations, the date in yyyy-mm-ddThh:mm:ss format, the filename of the measurement record and the flux density in milliJansky and its error. It also includes the averages for each observing session. The measurements are plotted below:
The measurements have been calibrated to NGC7027 at a 2010.0 value at 30GHz of 5387±40mJy. The daily averaged measurements use a weighted mean and the scatter on the data points; the errors do not include systematic or calibration errors (estimated to be ~8% of the source flux density). The full details of the calibration can be found in Peel (2009), Gawronski et al. (2010), and Peel et al. (2010). The source position observed was RA: 21h 02m 09.8s, Dec: +45d 46m 33.0s (J2000).
If you make use of this data, please reference ATEL #2905.
For more information on the V407 Cyg outburst, see the following publications, announcements and websites (given in reverse chronological order):
- "Gamma-Ray Emission Concurrent with the Nova in the Symbiotic Binary V407 Cygni", Fermi LAT Collaboration (2010), Science, 329, 817
- ATel 2741: "EVLA monitoring of V407 Cyg", 16 July 2010 (website)
- ATel 2546: "Discovery of coronal emission lines in V407 Cyg", 11 April 2010
- ATel 2536: "VLBI detection of V407 Cyg", 6 April 2010
- ATel 2514: "15-GHz flux density of V", 26 March 2010
- ATel 2511: "Radio detection of V407 Cyg at 30GHz with OCRA-p on the Torun telescope", 25 March 2010
- ATel 2506: "Radio detection of V407 Cyg - the possible counterpart of the new Fermi LAT Gamma-ray Transient J2102+4542 with the Effelsberg 100-m, OVRO 40-m and IRAM 30-m telescopes", 24 March 2010
- ATel 2498: "INTEGRAL view of the sky field containing Fermi J2102+4542", 22 March 2010 (map)
- ATel 2487: "Fermi LAT Detection of a New Galactic Plane Gamma-ray Transient in the Cygnus Region: Fermi J2102+4542, and its Possible Association with V407 Cyg", 18 March 2010
- CBET 2199, optical flare, unknown date
- AAVSO Alert Notice 419: "Nova eruption in V407 Cyg", 15 March 2010
- AAVSO Special Notice #201: "Outburst of the symbiotic star V407 Cyg", 12 March 2010
