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MASTER Prediscovery Detection of PNV J00434997+4114049 in M31

ATel #6490; D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), 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. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational 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 23 Sep 2014; 18:53 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Nova, Transient

Referred to by ATel #: 6498

Following the posting of PNV J00434997+4114049 at CBAT Transient Objects Confirmation Page, we have checked MASTER database for the reported position of this possible Nova in M31. MASTER-II telescope (double 0.40-m f/2.5 reflector + 4Kx4K CCD) located near Kislovodsk has observed the field of Andromeda Galaxy with two sets of 3x180-sec unfiltered exposures each clear night recently. Typical limiting magnitudes calibrated against USNO-B1.0 (0.8*R2+0.2*B2) were 19.2-19.5 on single exposures and 19.8-20.0 on the combined images. We have the deepest archival reference image without OT on 2011-12-16.67293 UT with unfiltered magnitude limit 21.2m.

CBAT TOCP lists the discovery date as 2014 09 22.320 UT and the unfiltered magnitude 18.6. MASTER-Kislovodsk has first detected the object at the reported position (740" west, 124" south of the center of M31) on 2014-09-19.777 UT at unfiltered magnitude 18.5. Checking our database shows the marginal detection as early as 2014-09-15 at 19.5m. The following upper limits and magnitudes were measured by the automatic photometry routines:

Obs. Date, UT    Mag.  Comments 
2014-09-13.927  >18.7  non-detection 
2014-09-15.948   19.5  first detection, SNR=4.8 
2014-09-19.777   18.5  SNR=8.6 
2014-09-21.689   18.3  SNR=7.7 
2014-09-22.700   18.4  SNR=7.9 
Our detection and reference images are posted at: http://master.sai.msu.ru/static/OT/004349.97411404.9.png

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