Optical follow-up of S5 1803+78
ATel #3323; R. Nesci, Unversity La Sapienza, Rome, Italy
on 5 May 2011; 00:01 UT
Credential Certification: Roberto Nesci (roberto.nesci@uniroma1.it)
Subjects: Optical, Blazar
Following the announcement of a Gamma-ray flare of the blazar S5 1803+78 (ATel #3322) on May 2 2011, I observed the source on May 4 2011 at 22:35 UT with the 23 cm telescope on top the Department of Physics of La Sapienza University with an R_C filter and an Apogee U2 CCD camera. Comparison stars were taken from Nesci et al. (2002, AJ 124, 53). The source appeared at R=15.6 +/-0.1, an average value for this source, whose large optical flares are at R~14. It seems therefore that no optical flare is ongoing. Further optical follow-up is needed to understand if the Gamma-ray and optical emissions are linked or not.
