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An optical search for transients lasting a few seconds

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arxiv 1910.11343 v1 pith:LHVWQ5EH submitted 2019-10-24 astro-ph.IM

Michael W. Richmond , Masaomi Tanaka , Tomoki Morokuma , Shigeyuki Sako , Ryou Ohsawa , Noriaki Arima , Nozomu Tominaga , Mamoru Doi
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Tsutomu Aoki Ko Arimatsu Makoto Ichiki Shiro Ikeda Yoshifusa Ita Toshihiro Kasuga Koji S. Kawabata Hideyo Kawakita Naoto Kobayashi Mitsuru Kokubo Masahiro Konishi Hiroyuki Maehara Hiroyuki Mito Takashi Miyata Yuki Mori Mikio Morii Kentaro Motohara Yoshikazu Nakada Shin-Ich Hiroki Onozato Yuki Sarugaku Mikiya Sato Toshikazu Shigeyama Takao Soyano Hidenori Takahashi Ataru Tanikawa Ken'ichi Tarusawa Seitaro Urakawa Fumihiko Usui Junichi Watanabe Takuya Yamashita Makoto Yoshikawa
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keywords opticalsourcesequivalentsearchsecondssurveytransientswide-field
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abstract

Using a prototype of the Tomo-e Gozen wide-field CMOS mosaic camera, we acquire wide-field optical images at a cadence of 2 Hz and search them for transient sources of duration 1.5 to 11.5 seconds. Over the course of eight nights, our survey encompasses the equivalent of roughly two days on one square degree, to a fluence equivalent to a limiting magnitude about $V = 15.6$ in a 1-second exposure. After examining by eye the candidates identified by a software pipeline, we find no sources which meet all our criteria. We compute upper limits to the rate of optical transients consistent with our survey, and compare those to the rates expected and observed for representative sources of ephemeral optical light.

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Cited by 1 Pith paper

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  1. The Local Galactic Transient Survey Applied to an Optical Search for Directed Intelligence

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    A modest sky survey using existing small telescopes is calculated to be capable of detecting optical laser beacons from an advanced civilization in nearby galaxies.

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