V. Lipunov, E.S. Gorbovskoy, N.Tyurina, V.Kornilov,
P.Balanutsa, A.Kuznetsov, D.Kuvshinov, I.Gorbunov
Lomonosov Moscow State University, Sternberg Astronomical Institute
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory
R.Rebolo, M.Serra, N.Lodieu, G.Israelian
The Instituto de Astrofisica de Canarias
R.Podesta, C.Lopez and F.Podest
Observatorio Astronomico Felix Aguilar (OAFA),
San Juan National University
H.Levato and C.Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University
V.Yurkov, Yu.Sergienko, A.Gabovich, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
MASTER Global robotic Net (MASTER-Net: http://observ.pereplet.ru) received
IceCube HESE event IceCube-160731A (AMON ICECUBE HESE 128290 6888376) at
2016-07-31 01:55:34.5 UT (30s after the EHE_event_time).
At the alert time there was a day at MASTER-Amur, -Tunka,
-Kislovodsk. It was under the horizont at At MASTER-SAAO ( -42.52deg ) and
MASTER-IAC ( -14.50). MASTER-OAFA (Argentina) did not received alert due
to problems with internet.
So we started observations at the following night.
MASTER-Kislovodsk robotic telescope (Kislovodsk, Russia) was pointed to
the IceCube neutrino 160731 event (Taboada et al GCN 19743) 61241 sec
after trigger time at 2016-07-31 19:23:17 UT. The 5-sigma upper limit has
been about 19.0 on single (180 sec) and 19.8 on coadd (1260 sec )
MASTER-IAC robotic telescope (Teide observatory, Canary Islands/Spain)
was pointed to the IceCube neutrino 160731 event 68442 sec after
trigger time at 2016-07-31 21:25:16 UT. The 5-sigma upper limit has been
about 20.0 on single (180 sec) and 20.7 on coadd (2160 sec )
MASTER-OAFA robotic telescope (Felix Aguilar observatory, Argentina) was
pointed to the IceCube neutrino 160731 event 75655 sec after trigger
time at 2016-07-31 22:55:29 UT. The 5-sigma upper limit has been about
19.8 on single (180 sec) and 20.5 on coadd (3600 sec ) unfiletered images.
No astrophysical OT detected inseide 2 square degrees around center AMON
ICECUBE HESE 128290 6888376 error-box.
However we detected and found:
1. MASTER OT J142038.73-002500.1 - the one point-like
partical CCD event from AMON ICECUBE HESE 128290 6888376 event error
Date Time Expt. Ra Dec Mag
2016-07-31 19:26:57 180 (14h 20m 38.73s -00d 25m 00.1s) 17.9
2. The very bright NGC5584 galaxy (12.8 mag) presented at Ice Cube error
Totaly there is 19 Galaxy up to 17 mag at Ice Cube error box.
The brightest galaxy at error box highlighted at out most deep image:
IAC images (lim = 20.7) is available at
OAFA image (lim= 20.4) is available at
3. We checked Swift X-ray sources (Evans et al., GCN 19747) inside this
The Source1 (215.69403d, -0.63777d) is a bright known star HD 125981
(A3IV, Skiff, Catalogue of Stellar Spectral Classifications), MASTER
doesnt' see variability.
The Source2 (214.90209d, -0.14592d) : there is no OT in MASTER-Net
database up to 20.7 unfiltered optical limit. There is infrared source
(AllWise, etc) in 2.2".
The Source3 (215.72267, -0.03074): there is a source with m_OT=19.0
without changhing with respect to MASTER-Net database. There is a USNO-B1
star with B2=19.49, R2=18.93.This star is a GALEX source (possible
accretion to the white dwarf companion).
The Source4 (215.72267, -0.60004): there is no source in MASTER images
(20.7 unfiltered optical limit in 68442sec after trigger) and in VIZIER
database (22m optical limit from POSS images).
The Source 5(214.95898, -0.11266) . There is a Sloan QSO in 4.1" , no
change with respect to MASTER database.
The Source 6 (214.61169, 0.24144). Known bright star (USNO-B1 B2=15.30,
R2=13.77,I=12.36), also a Galex source, i.e. possible accretting white
dwarf) without variability on MASTER database.
Results: Source 1, 3, 6 not coonected with IceCube event.
Swift XRT sources 2,4,5 are interested.
The message may be cited.