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GCN Circular 21595

Subject
LIGO/Virgo G298048: Subaru HSC z-band photometry confirms the fading nature of SSS17a
Date
2017-08-19T14:46:41Z (7 years ago)
From
Nozomu Tominaga at Konan U <tominaga@konan-u.ac.jp>
Tominaga, N. (Konan Univ.), Yoshida, M., Tanaka, M., Terai, T., Nakata, F.,
Furusawa, H., Koshida, S. (NAOJ), Utsumi, Y., Kawabata K. S. (Hiroshima Univ.),
Motohara, K., Ohsawa, R., Morokuma, T., Yasuda, N. (Univ. of Tokyo),
Kawai, N. (Tokyo Tech), and Asakura, Y. (Nagoya Univ.) on behalf of the
J-GEM collaboration

We performed z-band imaging observations for the gravitational wave event
G298048 (GCN 21505; 21509; 21513) with Hyper Suprime-Cam attached to the
Subaru telescope on August 19 2017 UT (Yoshida et al. GCN 21586).

We made photometric calibration with Pan-STARRS1 catalog (Chambers et al.
2016) using HSC pipeline (Bosch et al. 2017) and obtained psf magnitude
of SSS17a (Coulter et al. 2017; GCN 21529) as

        z = 17.8 (AB) (2017-08-19 05:26--05:52UT),

which is 0.5 mag fainter than the psf magnitude obtained with Subaru/HSC 
on August 18 UT (Yoshida et al. GCN 21561). The fading nature of SSS17a 
in the z-band is consistent with the reports in Nicholl et al. (GCN 21580) 
and Chambers et al. (GCN 21590).
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