[vsnet-grb-info 21282] IceCube-181023A: MASTER Net optical alert and follow up observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23381
SUBJECT: IceCube-181023A:  MASTER Net optical alert and follow up observations
DATE:    18/10/25 00:13:07 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

V.Lipunov, V.Kornilov, N.Tiurina, E. Gorbovskoy, A.Kuznetsov, D.Zimnukhov, D.Kuvshinov, P.Balanutsa, V.Vladimirov,  D.Vlasenko
Lomonosov Moscow State University, Physics Department, SAI

N.M.Budnev, O. Gres, Yu.Ishmuhametova
Irkutsk State University (API ISU)

D. Buckley,
South African Astronomical Observatory (SAAO)

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

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

R. Podesta, F. Podesta, C. Lopez, C.Francile
Observatorio Astronomico Felix Aguilar (OAFA)

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

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

MASTER Global Robotic Net started automatically IC181023A alert (from
socket coordinates)  observations  22 sec after notice time (MASTER-Tavrida) and
continued 1 day later as  IceCube-181023A (Blaufuss et al.GCN 23375,Pizzuto et al. GCN 23380) inspection  at MASTER-Kislovodsk.

MASTER-Tavrida robotic telescope (MASTER Net: Lipunov et.al.  2010, Advances in Astronomy, vol. 2010, 30L  http://www.hindawi.com/journals/aa/2010/349171/),
located in Lomonosov MSU, SAI Crimean astronomical station,
was pointed automatically to the  IC181023A error-box (taken from the socket)
22 sec after notice time and 66 sec after trigger time at 2018-10-23 16:38:38 UT.
We observed this socket error-box with unfiltered mlim=18.3 and not found 
new OT, connected with EHE neutrino astrophysical source.

The galactic latitude b =  7 deg., longitude l = 19 deg.
The observations made on zenit distance = 68 deg.
The sun  altitude  was -20.7 deg.
The moon (99 % bright part) was 21 deg. above the horizon. The distance 
between  moon and  object was 109 deg.


MASTER-Kislovodsk started IceCube-181023A (Blaufuss et al.GCN 23375 (RA:270.18 (-1.70,+2.00 deg); Dec: -8.57 (-1.30,+1.25 deg))
  inspection  with  mlim=17.0 between clouds  at 2018-10-24 15:31:39 UT

The observations made on zenit distance = 63 deg.
The moon (100 % bright part) was 11 deg. above the horizon. The distance  between  moon and  object was 121 deg.
The sun  altitude  was -15.2 deg.

Observations and more accurate reduction will be continued.
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