Physics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3127....1n&link_type=abstract
The Astronomer's Telegram, #3127
Physics
2
Optical, Agn, Blazar
Scientific paper
Prompted by Atel #3120 of a strong Gamma-ray flare of the BL Lac object CGRaBS J0211+1051, we observed it on January 27.87 2011 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. Eight comparison stars were taken from the GSC2.3 catalogue to define the source magnitude. The source appeared at R_C=13.37, definitely brighter that the historical GSC2.3 value of 15.11, based on the POSS I (year 1950) red plate.
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