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A Strong Optical Flare from QSO B2 1633+38

ATel #6930; A. B. Danilet, K. Z. Stanek, C. S. Kochanek, T. W.-S. Holoien, G. Simonian, U. Basu, N. Goss, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Obsrvatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), P. R.Wozniak (LANL), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 15 Jan 2015; 20:16 UT
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Blazar

Referred to by ATel #: 6942, 6954, 7004

B2 1633+38 (4C +38.41) is in a field observed by the 14-cm ASAS-SN quadruple "Brutus" telescope with a 2-3 day cadence, typical for our all-sky survey. The largest flare of B2 1633+38 in the ASAS-SN data was discovered on UT 2015-01-14.64 at V~14.9 mag. This figure shows the complete ASAS-SN V-band photometry for this interesting object, spanning more than 1000 days. In the last three epochs ASAS-SN measured the following V-band brightness

 UT Date          V 
2015-01-01.660   17.0 
2015-01-09.654   16.2 
2015-01-14.635   14.9 
with the last data point significantly brighter than any previous ASAS-SN measurement.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported in part by Mt. Cuba Astronomical Foundation. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.