[vsnet-grb-info 22576] IceCube-190504A: Kanata optical/NIR follow-up observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24675
SUBJECT: IceCube-190504A: Kanata optical/NIR follow-up observations
DATE:    19/05/30 01:42:31 GMT
FROM:    Mahito Sasada at Hiroshima University  <sasadam at hiroshima-u.ac.jp>

 Sasada, M., Nakaoka, T., Akitaya, H., Kawabata K., S. (Hiroshima U),
Utsumi, Y. (Stanford/SLAC),
Itoh, R. (Bisei Astronomical Observatory),
Morokuma, T. (U. Tokyo),
Ohta, K., Yamanaka, M. (Kyoto U)

In response to the IceCube-190503A alert (GCN Circular No. 24378), HONIR --
the optical-NIR muti-band simultaneous multi-capable instrument -- on the
1.5m Kanata telescope observed possible Blazar candidates. The candidates
were selected from our sample prepared for finding an IceCube counterpart.
None of them were flared up within two days observations. We also checked
our images with archival PanSTARRS images, and didn't find any transient.

ra,         dec,      5/4 R J   Ks,   5/5 R J   Ks
119.797654, 6.627546, 19.6 18.8 ----, 19.4 19.0 ----
120.038609, 6.164517, 20.3 19.4 17.4, 19.3 19.3 17.0
120.222161, 6.857248, 16.0 ---- ----, 17.7 17.9 ----
120.267315, 6.441576, 19.1 18.6 ----, 18.6 18.6 ----
120.318049, 6.476643, 17.3 15.8 ----, 17.6 18.0 ----
120.375726, 6.197231, 19.8 19.2 17.5, 19.8 19.3 13.0

All limiting magnitudes with 5 sigma in AB unit are calibrated with
PanSTARRS and 2MASS point sources.

This result is consistent with GCN Circular No. 24409. We acknowledge
OISTER collaboration.