ASAS-SN Detection of an Optical Brightening in FSRQ PKS 1441+25

ATel #7429; B. J. Shappee (Hubble Fellow, Carnegie Observatories), K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, A. B. Danilet, G. Simonian, U. Basu, N. Goss, J. F. Beacom, T. A. Thompson (Ohio State), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), P. R. Wozniak (LANL), E. Falco (CfA), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 22 Apr 2015; 01:29 UT
Credential Certification: Benjamin Shappee (bshappee@obs.carnegiescience.edu)

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During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, we detect optical brightening from the flat spectrum radio quasar PKS 1441+25 coincident with the Optical, X-, Gamma-ray flare detected by Fermi from 2015-03-21 through 2015-04-15 (ATel #7402).

ASAS-SN first detected the brightening in images obtained on UT 2015-03-20.40 at V~17.0 mag. We also detected PKS 1441+25 in images obtained on 2015-03-21.50, 2015-03-24.43, 2015-04-09.50, 2015-04-10.43, 2015-04-13.55, 2015-04-15.52, and 2015-04-18.43 but we do not detect any emission at this location 2015-03-18.55 (V>17.5) and before (from 2012-01-25.63; upper limits range from V~16.2-18.2).

 
JD            Observation Date     V mag  V err 
2457084.93    2015-03-03.43        >16.5   
2457096.90    2015-03-15.40        >17.7   
2457099.06    2015-03-17.56        >17.4   
2457100.05    2015-03-18.55        >17.5   
2457101.90    2015-03-20.40         17.0  0.2 
2457103.00    2015-03-21.50         17.6  0.2 
2457105.93    2015-03-24.43         17.4  0.2 
2457108.94    2015-03-27.44        >16.8   
2457110.86    2015-03-29.36        >17.5   
2457111.87    2015-03-30.37        >16.7   
2457114.89    2015-04-02.39        >16.3   
2457119.08    2015-04-06.58        >16.4   
2457121.01    2015-04-08.51        >16.5   
2457122.00    2015-04-09.50         16.9  0.2 
2457122.93    2015-04-10.43         16.7  0.1 
2457126.05    2015-04-13.55         16.5  0.1 
2457128.02    2015-04-15.52         16.5  0.1 
2457130.93    2015-04-18.43         16.4  0.1 

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.