[vsnet-grb-info 19217] IceCube-170312A: MASTER follow-up observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20903
SUBJECT: IceCube-170312A: MASTER follow-up observations 
DATE:    17/03/18 10:12:27 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

  N.V.Tyurina, V.M. Lipunov,  E.S. Gorbovskoy, A.S.Kuznetsov,
P.Balanutsa, V.V.Vladimirov, V.V.Chazov, D.Kuvshinov
Lomonosov Moscow State University, Sternberg Astronomical Institute

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

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

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

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

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

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

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

MASTER Global Robotic Net was starting inspection of IceCube HESE neutrino 
alert  IceCube-170312A  (Blaufuss et al. GCN #20857: RA(2000)= 305.15 
-26.61, Triggertime= 2017-03-12 13:49:39.83 UT)
on 2017-03-13 02:06:34UT at MASTER-SAAO (Object: Altitude: 20.35, Sun: 
Altitude: -30.72,Dist. to Moon: 123.282677, Moon disk: 0.997328)
and on 2017-03-14 08:38:51UT at MASTER-OAFA (Object: Altitude: 27.61, Sun: 
Altitude: -25.02,Dist. to Moon: 107.465652, Moon disk: 0.968195).
MASTER-II is 2x4sq.degrees (Lipunov et al., 2010, Advances in Astronomy, 
2010, 30L)

At alert time the state at MASTER observatories are:
MASTER-Amur            Object: Altitude: -61.72 Sun: Altitude: -37.55
MASTER-Tunka           Object: Altitude: -64.60 Sun: Altitude: -25.23
MASTER-Kislovodsk      Object: Altitude: -35.78 Sun: Altitude:  13.57
MASTER-SAAO            Object: Altitude:  11.19 Sun: Altitude:  37.97, 
inspect on13 Mar, mlim=19.2, 20 images
MASTEC-IAC(Tenerife)   Object: Altitude:  13.06 Sun: Altitude:  57.41
MASTER-OAFA(Argentina) Object: Altitude:  84.05 Sun: Altitude:  39.69, 
inspect on 13,19 Mar, mlim=18.5-19.1, 16 images

MASTER auto-detection software doesn't detect optical transient, that can 
be connected with IC alert.

We analized SWIFT Xray sources (Keivani et al., GCN#20890)

1) 20 21 21.41 -26 01 32.3
There is no optical sources up to unfiltered mlim=19.2 during MASTER-SAAO 
inspection of this IC170312 alert on 2017-03-13 02:37:14UT, and mlim=18.5 
(2017-03-14 08:38:51UT), mlim=18.7(2017-03-18 07:38:23UT) in MASTER-OAFA .
There is a faint MASTER optical detection with m<< (unfiltered mlim=19.9) 
in MASTER-IAC database on 2016-07-28 00:13:46UT.
The nearest optical source in VIZIER database is in 5.5", also GALEX 
source(offset is 6.7").

2)20 21 54.52 -26 04 12.0
There is a variable optical source in MASTER database (17.5-18.7 
MASTER-IAC, MASTER-SAAO) with m_OT=18.3 on 2017-03-13 02:59:57.059UT 
(MASTER-SAAO)

There is a GALEX source in 2.6", also optical (USNO,etc) and possible AGN 
(Secrest+, 2015).
http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=&-out.add=_r&-out.add=_RAJ%2C_DEJ&-sort=_r&-to=&-out.max=20&-meta.ucd=2&-meta.foot=1&-c=305.47716666667+-26.07&-c.rs=5

3) 20 18 26.4s -26 50 24.6
Variable optical source in MASTER database :
m_OT=18.7 on 2017-03-13 02:59:57.059UT (MASTER-SAAO)
17.8(2016-10-21 00:34:28.062UT) - 18.8 (2017-03-18 07:34:39.474) 
MASTER-OAFA

4) 20 16 34.69 -26 38 56.6
There is no optical sources brighter then unfiltered mlim=19.2 during 
MASTER-SAAO inspection on 2017-03-13 02:24:33UT,
and in archive images in MASTER-IAC on 2016-07-11 01:42:30UT with 
mlim=20.2
There is no sources in VIZIER

5) 20 19 25.94 -26 06 09.9
There is an optical source in MASTER-SAAO with m_OT~19.3 (mlim=19.5)

There is USNO-B1 star with R1=19.20, B2=20.44 in 1.6", also candidate to 
AGN (Secrest+, 2015).
http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=&-out.add=_r&-out.add=_RAJ%2C_DEJ&-sort=_r&-to=&-out.max=20&-meta.ucd=2&-meta.foot=1&-c=304.85808333333+-26.10275&-c.rs=5


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