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Three Optical Transients discovered by MASTER

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Joined: 2010-03-12

The MASTER team P. Balanutsa, D. Denisenko et al, have announced the discovery of three new optical transients, two probable Cvs and another of unknown nature. 

 
MASTER J221621.91+705415.5 - new CV
MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 22h 16m 21.91s +70d 54m 15.5s on 2012-06-03.65575 UT. The OT unfiltered magnitude is 15.3m (limit 17.3m). The OT is seen in 2 images. We have reference image without OT on 2011-11-23.39090 UT with magnitude limit in 'R' filter 18.4m.
 
MASTER J221811.12+654219.9 - new bright CV
MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 22h 18m 11.12s +65d 42m 19.9s on 2012-06-03.65463 UT. The OT unfiltered magnitude is 14.3m (limit 17.3m). The OT is seen in 2 images.
 
MASTER J220943.06+653834.1 - ?
MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 22h 09m 43.06s +65d 38m 34.1s on 2012-06-03.65463 UT. The OT unfiltered magnitude is 17.5m (limit 17.6m). The OT is seen in 2 images. We have reference image without OT on 2011-08-26.66396 UT with magnitude limit in 'R' filter 19.1m.
 
No previous outbursts were found on DSS plates. Nothing is present at this position in GCVS, 1RXS and 2MASS catalogues and in AAVSO VSX. This area is not covered by SDSS and GALEX. Spectral observations are required to determine the nature of this OT.
 
Further information as well as links to discovery and reference images are available in ATel #4150.
AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484