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MASTER: high amplitude OT and OT during Fermi inspection

ATel #10470; P. Balanutsa, V. Lipunov (Lomonosov MSU), R. Rebolo, M. Serra-Ricart (IAC), R. Podesta (OAFA), H. Levato (ICATE), D. Buckley (SAAO), E. Gorbovskoy, N. Tiurina, V. Shumkov, O. Gress, T. Pogrosheva, A. Kuznetsov, V. Kornilov, V. Chazov, D. Vlasenko, V. Vladimirov, I. Gorbunov, A. Krylov (Lomonosov Moscow State University, SAI), C. Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar San Juan University), C. Saffe (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio), A. Gabovich (BSPU)
on 6 Jun 2017; 18:22 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables

Referred to by ATel #: 10480

MASTER OT J230148.65+411904.2 discovery - OT, found during Fermi inspection, ampl>2.5m

During 518279290 Fermi trigger (short GRB)/ (GRB_TIME: 17/06/04 14:28:05.09 UT, GRB_RA,Dec(2000):22h 41m 46s,+40d 40' 12", GRB_ERROR: 4.10 [deg radius, statistical only] )inspection
MASTER-Kislovodsk auto-detection system detected optical transient at (RA, Dec) = 23h 01m 48.65s +41d 19m 04.2s on 2017-06-04.97120 UT.
The OT unfiltered magnitude is 19.2m (limit 19.3m).
The OT is seen in 2 images on 2017-06-04 23:24:32.336,23:18:32.825UT (MASTER's Fermi inspection mode of observations). There is no minor planet at this place.
We have reference unfiltered images only without OT since 2010-11-06 15:32:02UT (mlim=20.2), the nearest in time is on 2016-10-28 14:52:42UT with mlim=19.4(MASTER-Tunka).
There is USNO-B1 star in 1.8" with known B1,B2(20.7) and Rlimit=22m, that means more then 2.5m of currentoutburst amplitude (MASTER W=0.2B+0.8R (B2R2/B1R1))
So as GRB is short, this OT must not be connected with trigger.
But Spectral observations are required for it.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/230148.65411904.2.png

MASTER OT J132501.0+431846.1 - high amplitude(>7m) new dwarf nova outburst

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) =13h 25m 01.0s +43d 18m 46.1s on 2017-06-05 2017-06-05 22:55:12.053UT with m_OT=15.4
There are 3 images with OT.There is no minor planet outside.
There is no any sources in VIZIER - both POSS, both SLOAN, it means (23.5m red Sloan's neighboring stars as example) more then 7m amplitude of current outburst.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/MASTEROTJ132501.0+431846.1.jpg

MASTER OT J090351.95+575403.0 detection - preliminary UVCet type
MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 09h 03m 51.95s +57d 54m 03.0s on 2017-06-05.85530 UT.
The OT unfiltered magnitude is 17.0m, m_OT=17.9 on the 05.85946(the limit is 18.3m).
The OT is seen in 3 image. There is no minor planet at this place.
We have reference image without OT on 2017-01-09.08191 UT with unfiltered magnitude limit 20.3m.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/090351.95575403.0.png

MASTER OT J233638.01-582227.1 detection - UVCet type

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 23h 36m 38.01s -58d 22m 27.1s on 2017-05-30.01400 UT.
The OT unfiltered magnitude are:
2017-05-30 00:20:10.565 16.57
2017-05-30 00:23:53.377 16.98
2017-05-30 00:27:34.305 17.91
The OT is seen in 5 images. There is no minor planet at this place.
We have reference image on 2015-03-18.13146 UT with unfiltered mlim= 20.2m.

Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/233638.01-582227.1.gif

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net