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- W3105192757 abstract "We present the results of the detailed analysis of an optical imaging survey conducted using the Subaru / Hyper Suprime-Cam (HSC), which aims to identify an optical counterpart to the gravitational wave event GW151226. In half a night, the $i$- and $z$-band imaging survey by HSC covers 63.5deg$^2$ of the error region, which contains about 7% of the LIGO localization probability, and the same field is observed in three different epochs. The detectable magnitude of the candidates in a differenced image is evaluated as $i sim 23.2$ mag for the requirement of at least two 5$sigma$ detections, and 1744 candidates are discovered. Assuming a kilonova as an optical counterpart, we compared the optical properties of the candidates with model predictions. A red and rapidly declining light curve condition enables the discrimination of a kilonova from other transients, and a small number of candidates satisfy this condition. The presence of stellar-like counterparts in the reference frame suggests that the surviving candidates are likely to be flare stars. The fact that most of those candidates are in galactic plane, $|b|<5^{circ}$, supports this interpretation. We also checked whether the candidates are associated with the nearby GLADE galaxies, which reduces the number of contaminants even with a looser color cut. When a better probability map (with localization accuracy of $sim50{rm deg}^2$) is available, kilonova searches of up to approximately $200$ Mpc will become feasible by conducting immediate follow-up observations with an interval of 3--6 days." @default.
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- W3105192757 date "2017-12-08" @default.
- W3105192757 modified "2023-10-18" @default.
- W3105192757 title "A challenge to identify an optical counterpart of the gravitational wave event GW151226 with Hyper Suprime-Cam†" @default.
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- W3105192757 doi "https://doi.org/10.1093/pasj/psx125" @default.
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