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Very Bright Optical Transient discovered by MASTER

ATel #6059; V. Vladimirov, V. Lipunov, D. Denisenko, E. Gorbovskoy, P. Balanutsa, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov, A. Rufanov (Moscow State University, SAI), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), 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 10 Apr 2014; 09:18 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Nova, Transient

Referred to by ATel #: 6061

MASTER OT J175924.12+252031.7 - Possible Nova in Hercules

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 17h 59m 24.12s +25d 20m 31.7s on 2014-04-09.75507 UT. The OT unfiltered magnitude is 12.8m (limit 18.0m). The OT is seen in 9 images. There is no minor planet at this place. We have reference image without OT on 2012-08-20.59372 UT with unfiltered magnitude limit 18.3m. The object was not present on MASTER-Kislovodsk images obtained on 2014-03-16.024 UT (limit 18.0m).

There are two red objects in SDSS offset by 1.2" and 1.8" of the OT: the brighter one SDSS J175924.20+252033.1 (g=22.25 r=20.67 i=19.25) with Type=STAR in SDSS DR7 and GALAXY in SDSS DR9 and the fainter one SDSS J175924.13+252032.8 (g=21.46 r=22.35 i=24.36) with the flag Deblended at edge.

There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Hercules is not covered by Catalina Sky Survey. No previous outbursts were detected by Mount Lemmon Survey.

Based on the red color of a possible progenitor and large outburst amplitude (~8m), MASTER OT J175924.12+252031.7 is most likely a classical Nova. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/175924.12252031.7.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net