MASTER: prediscovery limit for possible Nova in M31 KAIT-16ai/MASTEROTJ004003.13+414518.7

ATel #9271; E. Popova, V. Lipunov (Lomonosov MSU), R. Rebolo Lopez, M. Serra-Ricart (IAC), E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, V. Shumkov, D. Kuvshinov, D. Vlasenko, V. Vladimirov, V. Chazov (Lomonosov Moscow State University, SAI), G. Israelyan, N. Lodieu ( Instituto de Astrofisica de Canarias), N. Budnev, O. Gress, K. Ivanov (API, Irkutsk State University)
on 27 Jul 2016; 09:05 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J004003.13+414518.7 independent discovery - possib. Nova in M31

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 00h 40m 03.13s +41d 45m 18.7s on 2016-07-27.20056UT.
The OT unfiltered (W=0.2B+0.8R calibrated by USNO-B1) magnitude is 16.5m (limit 19.2m).
The OT is seen in 11 images.
We have reference image without OT on 2016-07-26.206UT with m_lim=19.2, on 2016-07-04.19304 UT with unfiltered magnitude limit 20.5m.
This OT was independently discovered at 2016/07/26.478 by KAIT (AT2016ejb=KAIT-16ai http://www.rochesterastronomy.org/novae.html )

Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/004003.13414518.7.png

MASTER Global Robotic Net