4C+28.07 still brightening
ATel #3709; R. Nesci (University La Sapienza), S. Sclavi (University La Sapienza), F. Montagni (Greve in Chianti Observatory)
on 25 Oct 2011; 20:05 UT
Credential Certification: Roberto Nesci (roberto.nesci@uniroma1.it)
Subjects: Optical, AGN, Blazar
We continued our monitoring of the blazar 4C +27.08, after the Gamma-ray flare reported in ATel #3670, with the 23.5cm TACOR telescope of the Department of Physics at La Sapienza University and the 31cm Newtonian telescope of Greve in Chianti. The TACOR uses an Apogee U2 CCD camera with a KAF1603 chip and a standard R (Cousins) filter; the Greve telescope uses a DTA CCD camera equipped with a back-illuminated SITe SIA502a chip and V, R and I (Cousins) filters. Magnitudes are in the scale of the GSC2.3 catalogue. Consistency of the two instrumental setups has been checked since long time.
Exposure times were 30 minutes for the TACOR (summing several frames) and 5 minutes for the Greve telescope. Photometric internal errors are about 0.05 magnitudes.
| Telescope | date | V | R | I |
| Greve | 2011-10-08 | --- | 16.46 | 15.76 |
| TACOR | 2011-10-08 | --- | 16.46 | --- |
| Greve | 2011-10-17 | 16.33 | 16.02 | 15.29 |
| Greve | 2011-10-18 | 16.26 | 15.96 | 15.19 |
| Greve | 2011-10-21 | --- | 16.04 | 15.38 |
| TACOR | 2011-10-22 | --- | 15.83 | --- |
The source has been monitored in radio (ATel #3674) and in the UV and X-ray by Swift (ATel #3676).
After our optical observation of 2011-10-06 reported in ATel #3672, it is apparent that the source is still brightening in optical, several days after the Gamma-ray flare (2011-10-03). Further monitoring is encouraged to detect the end of the bright phase.
Greve in Chianti Observatory
