MASTER detection of Quasar Flare

ATel #6063; P. Balanutsa, V. Lipunov, N. Tiurina, D. Denisenko, E. Gorbovskoy, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 11 Apr 2014; 14:25 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J161633.80+333044.1 - flaring quasar

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 16h 16m 33.80s +33d 30m 44.1s on 2014-04-06.70830 UT. The OT unfiltered magnitude is 17.4m (limit 19.1m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2012-08-09.59118 UT with unfiltered magnitude limit 19.1m.

The OT at quiescence is identical to quasar FIRST J161633.7+333043 = NVSS J161633+333043 = SDSS J161633.77+333043.4 (g=19.52 r=19.13 i=18.84) with the unknown redshift. There is also an UV counterpart GALEX J161633.7+333044 (NUV=21.96+/-0.32) and IR detection WISE J161633.77+333043.5 (W1=14.58+/-0.03 W2=13.66+/-0.04 W3=11.18+/-0.10 W4=8.12+/-0.12).

The object is showing variability from ~20.5m to 18.2m in Catalina Sky Survey data: CSS J161633.9+333043. Follow up observations (especially the spectroscopy) are required. Estimates of redshift vary from z=2.22 in SDSS Data Release 7 to z=0.0 in SDSS DR8, including photometric redshift zph=0.435. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/161633.80333044.1.png

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