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Three OTs of different types detected by MASTER

ATel #4873; P. Balanutsa, V. Yecheistov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov (Moscow State University, SAI), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov, A. Punanova (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress, A. Frolova, (Irkutsk State University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov (Blagoveshchensk Educational University), P. Podvorotny, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 8 Mar 2013; 21:22 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Radio, Optical, Gamma Ray, AGN, Blazar, Star, Supernovae, Transient, Variables

MASTER OT J034216.27+385906.0 - flare of blazar 1FGL J0342.2+3859

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 03h 42m 16.27s +38d 59m 06.0s on 2013-03-07.46815 UT. The OT unfiltered magnitude is 17.9m (limit 18.6m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2012-10-18.73328 UT with unfiltered magnitude limit 19.0m. The object was previously detected by MASTER-Kislovodsk at 17.8m on 2011-12-22.810 UT and by MASTER-Tunka on 2011-12-25.611 UT.

There is a stellar object in SDSS DR8 SDSS J034216.26+385906.2 with magnitudes u=21.70 g=21.27 r=20.87 i=20.57 z=20.28. No optical variability was reported in literature before.

The OT is identical to the gamma-ray source 1FGL J0342.2+3859 from Fermi-LAT AGN catalog (Abdo et al., 2010). It is also listed as a variable 1.4GHz radio source from NSVS and FIRST (Ofek et al., 2011). Multi-wavelength observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/034216.27385906.0.png

MASTER OT J134111.60+140348.8 - flare star of UV Ceti type

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 13h 41m 11.60s +14d 03m 48.8s on 2013-03-07.64100 UT. The OT unfiltered magnitude is 15.4m (limit 18.2m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2013-02-20.87125 UT with unfiltered magnitude limit 18.8m.

The OT has faded below 18.5m on the 60-sec exposure images taken 50 minutes later.

Obs. date  Exp.start Mag. 
2013-03-07 15:21:23  15.17+/-0.05 
2013-03-07 15:23:03  15.39+/-0.06 
2013-03-07 15:24:41  15.43+/-0.06 
2013-03-07 16:12:20 <18.5 
2013-03-07 16:40:32 <18.5

The object is identical to the red star SDSS J134111.62+140349.7 (u=23.57 g=20.87 r=19.36 i=17.95 z=17.16) and 2MASS 13411162+1403496 (J=15.72 H=15.17 K=14.99). No previous flares were detected by NEAT in 2000-2005 (65 images on 22 different nights) and by CSS in 2005-2012. Nothing is present at this position in 1RXS, GALEX, GCVS and AAVSO VSX.

Based on the quick fading, amplitude and color we conclude that MASTER OT J134111.60+140348.8 is a new flaring star of UV Ceti type. Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/134111.60140348.8.png

MASTER OT J111154.50+453214.9 - PSN in PGC 34057

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 11h 11m 54.50s +45d 32m 14.9s on 2013-03-07.82440 UT. The OT unfiltered magnitude is 16.9m (limit 18.6m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2013-02-11.761 UT with unfiltered magnitude limit 18.6m.

The object is located 24.1"E and 14.3"S of the nucleus of PGC 34057 galaxy aka SDSS J111152.18+453229.0 (z=0.02846). We suggest it to be a Supernova. Spectral confirmation is required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/111154.50453214.9.png

List of optical transients discovered by MASTER

Global MASTER Robotic Net