TITLE:   GCN CIRCULAR
NUMBER:  20869
SUBJECT: LIGO/Virgo G275404: Medicina radio follow-up of near-infrared
DATE:    17/03/14 17:19:16 GMT
FROM:    Francesco Verrecchia at ASDC, INAF-OAR  <verrecchia@asdc.asi.it>

M. Pilia, A. Pellizzoni (INAF/OA-Cagliari), M. Tavani (INAF/IAPS, and Univ.
Roma Tor Vergata), S. Loru, A. Trois (INAF/OA-Cagliari),  F. Verrecchia,
F. Lucarelli (ASDC and INAF/OAR), C. Pittori (ASDC),  M. Cardillo, G.
Minervini, P. Munar-Adrover, G. Piano, A. Ursi, A. Argan, Y. Evangelista
(INAF/IAPS),  A. Bulgarelli, V. Fioretti, A. Zoli, N. Parmiggiani, F.
Fuschino (INAF/IASF-Bo), M. Marisaldi (INAF/IASF-Bo and Bergen University),
F. Longo (Univ. Trieste and INFN Trieste), I. Donnarumma (ASI),  A. 
Giuliani
(INAF/IASF-Mi), report on behalf of the AGILE Team:

Following the LIGO/VIRGO event G275404, we performed radio C-band (5 GHz)
single-dish imaging centered at the position of the infrared transient
candidate detected by the Kanata Telescope HONIR camera at RA=19:10:31.46,
DEC=+07:53:52.0 (Yoshida et al. GCN 20784), placed at the edge of the
Galactic Bubble N82, seen in IR by Spitzer (Churchwell et al., 2006, ApJ,
649, 759). This source was within the error box of the transient candidate
found in the AGILE-GRID data, AGL J1914+1043 (Tavani et al. GCN 20754).

The observations were performed using the 32-m Medicina radio telescope on
2017-03-06 UT. We detected a bright radio source at the center of the
observed field of 1 x 1 deg. The source appears slightly larger than the
7.4 arcmin beam of the receiver. The flux density at 5 GHz was 3.3 +/- 
0.5 Jy
(MJD 57818.4375). The source emission, peaking at RA=19:10:30, 
DEC=+07:52:00,
is compatible with the coordinates of the Galactic Bubble N82, including 
the
NIR Kanata source.

Within the half-power-beam-width from the source centroid, 7 radio sources
are present, mostly unidentified. We report below a list of the sources,
their coordinates, flux density, radius and possible association (source
SIMBAD):

NAME                R.A.        DEC         FLUX(Jy)    R(') ASSOC.
-------------------------------------------------------------------------
GPA 042.13-0.62  19:10:32.1  +07:53:22   2.81(@8.35GHz) 5      -
G042.114-0.622   19:10:31.7  +07:52:40   0.35(@1.4GHz)  - extragalactic
GB6 B1908+0747   19:10:28.8  +07:52:28   0.39(@327MHz)  <~3  HII?
HSNH 115         19:10:31.6  +07:52:18   2.1(@10GHz)    3.3    -
RFS 713          19:10:30.0  +07:51:51   3.3(@2.7GHz)   6      -
GP 1908+0746     19:10:33.7  +07:51:51   0.54(@327MHz)  6      -
RRF 312          19:10:21.3  +07:50:34   5.5(@1.4GHz)   13.3   -

Variability analysis on long and short time-scales are ongoing.