[vsnet-grb-info 21421] MASTER: OTs detection during Fermi alert trigger 565936249 early observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23520
SUBJECT: MASTER: OTs detection during Fermi alert trigger 565936249  early observations 
DATE:    18/12/08 10:10:39 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

A.Chasovnikov, V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, 
N.Tyurina, P.Balanutsa, A.Kuznetsov, D.Vlasenko, I.Gorbunov, A.Krylov
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University

R. Podesta, Carlos Lopez and F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA)

Hugo Levato 
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory

K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk
Irkutsk State University

V. Yurkov, A. Gabovich, Yu. Sergienko
Blagoveschensk Educational State University, Blagoveschensk

R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias

D. Buckley, S. Potter, A. Kniazev, M. Kotze
South African Astronomical Observatory


MASTER-OAFA robotic telescope (Global MASTER-Net: 
http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan 
National University) was pointed to the  possible long GRB181208.19 17 sec 
after notice time and 123 sec after trigger time at 2018-12-08 04:32:47 UT. On our 
first (20s exposure)  set we  found 617 optical transient within FERMI 
error-box (ra=103.917 dec=-66.59 r=3.05) brighter than 18.2.


MASTER OT J063515.49-624002.9  - No known CV.

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic 
Net",Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 06h 
35m 15.49s -62d 40m 02.9s on 2018-12-08.19993 UT.
The OT unfiltered magnitude is 17.2m (mlim=19.0m).

The OT is seen in 2 images. There is no minor planet at this place.
There is 21 mag star in USNO-B1.0 catalog with 0.5 arcsec offset.
We have 22 November 2018 image without object with 18.4 mag limit.
We have reference image without OT on 2018-02-19.09796 UT with magnitude 
limit in 'BLANK' filter 20.2m.

Cheking of the robots OT candidtates is continuated.

The discovery and reference images are available at:

http://master.sai.msu.ru/static/OT/063515.49-624002.9.png

Spectral observations are required.


MASTER OT J231531.76-304848.3  - 13 mag Known Dwarf Nova in Flare!

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 23h 
15m 31.76s -30d 48m 48.3s on 2018-12-07.79828 UT.
The OT unfiltered magnitude is 13.3m (limit 18.9m).

The OT is seen in 16 images. There is no minor planet at this place.

We have reference image without OT on 2018-10-01.03255 UT with unfiltered 
magnitude limit 19.5m.

Spectral observations are required.

The discovery and reference images are available at:

http://master.sai.msu.ru/static/OT/231531.76-304848.3.png




The covered map is available at
http://master.sai.msu.ru/static/png/GRB181208.19/FERMI//224854545.png.1.png
The covered map is available at
http://master.sai.msu.ru/static/png/GRB181208.19/FERMI//224854545.png.3.png

The 5-sigma upper limit has been about 18.3mag


The galactic latitude b = -24 deg., longitude l = 277 deg.
The observations made on zenit distance = 39 deg.The moon ( 1 % bright 
part) below the horizon (The altitude of the Moon is -37 deg. ).
The sun  altitude  is -35.5 deg.
The object can be observed till sunrise at 2018-12-08 09:24:03

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