Fast optical brightening of BL Lacertae

Details Fast optical brightening of BL Lacertae Fast optical brightening of BL Lacertae

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3371....1l&link_type=abstract

The Astronomer's Telegram, #3371

Astronomy and Astrophysics

Astronomy

1

Optical, Agn, Blazar

Scientific paper

With reference to ATel #3368, announcing the Fermi LAT detection of increasing gamma-ray activity of BL Lacertae, we report on its optical brightening. Observations in St. Petersburg reveal R = 13.87 ± 0.01 on May 14.99, R = 13.06 ± 0.01 on May 21.95 and R = 12.71 ± 0.01 on May 22.97, with a brightness increase of 0.36 mag in 24.5 hours. These brightness levels are comparable to those reached during the outbursts of 1997-2004.

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