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Follow-up survey for the binary black hole merger GW200224_222234 using Subaru/HSC and GTC/OSIRIS
Takayuki Ohgami, Josefa Becerra Gonzalez, Nozomu Tominaga +19
The LIGO/Virgo detected a gravitational wave (GW) event, named GW200224_222234 (a.k.a. S200224ca) and classified as a binary-black-hole coalescence, on February 24, 2020. Given its…
Optical follow-up observation for GW event S190510g using Subaru/Hyper Suprime-Cam
Takayuki Ohgami, Nozomu Tominaga, Yousuke Utsumi +13
A gravitational wave event, S190510g, which was classified as a binary-neutron-star coalescence at the time of preliminary alert, was detected by LIGO/Virgo collaboration on May 10…
No Evidence of Intrinsic Optical/Near-Infrared Linear Polarization for V404 Cygni During its Bright Outburst in 2015: Broadband Modeling and Constraint on Jet Parameters
Y. T. Tanaka, R. Itoh, M. Uemura +39
We present simultaneous optical and near-infrared (NIR) polarimetric results for the black hole binary V404 Cygni spanning the duration of its 7-day long optically-brightest phase…
Dense optical and near-infrared monitoring of CTA 102 during high state in 2012 with OISTER: Detection of intra-night "orphan polarized flux flare"
Ryosuke Itoh, Yasushi Fukazawa, Yasuyuki T. Tanaka +35
CTA 102, classified as a flat spectrum radio quasar at z=1.037, produced exceptionally bright optical flare in 2012 September. Following Fermi-LAT detection of enhanced gamma-ray a…