MAXI/GSC detection of a possible X-ray flare from an dMe binary system YY Gem
ATel #8090; Y. Nakamura, S. Kanetou ,Y. Tsuboi, R. Sasaki (Chuo U.), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Serino, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), N. Kawai, M. Arimoto, T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, R. Imatani (Osaka U.), H. Negoro, M. Nakajima, K. Tanaka, T. Masumitsu (Nihon U.), Y. Ueda, T. Kawamuro, T. Hori (Kyoto U.), M. Yamauchi, D. Itoh (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Morii (ISM)
on 24 Sep 2015; 09:08 UT
Credential Certification: Yohko Tsuboi (tsuboi@phys.chuo-u.ac.jp)
Subjects: X-ray, Binary, Star, Transient, Variables
MAXI/GSC observed a possible X-ray flare from a dMe binary system YY Gem.
The MAXI/GSC nova alert system triggered on the flare-like event from the position consistent with the active binary system YY Gem during a scan transit at 01:29:00 UT on September 24th 2015. Any source was not detected significantly (< 20 mCrab at 4-10 keV) with MAXI/GSC during the next transit at 03:01:46 UT on the same day.
The position of the X-ray enhancement is
(113.650 deg, 32.100 deg) = (07 34 36, +32 06 00) (J2000)
with a statistical 90% C.L. elliptical error region with long and short radii of 0.41 deg and 0.38 deg respectively. The roll angle of long axis from the north direction is 41.0 deg.
There is an additional systematic uncertainty of 0.1 deg (90%
containment radius).
This position is consistent with that of an dMe binary, YY Gem,
which is listed in the ROSAT Bright Source Catalog.
No other source listed in the catalog is in the
error region.
The 4-10 keV flux over the one scan transits
was about 144+-35 mCrab.
These are corresponding to a luminosity of 6× 10 31 ergs/s
for an assumed distance of 13.4 pc.
This is the first detection of this source with MAXI/GSC.
