MAXI/GSC detection of a superburst from 4U 0614+091
ATel #6668; M. Serino (RIKEN), S. Nakahira (JAXA), T. Mihara (RIKEN), N. Kawai (Tokyo Tech), S. Ueno, H. Tomida, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), M. Sugizaki, M. Morii, J. Sugimoto, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN), T. Yoshii, Y. Tachibana (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, D. Uchida (Osaka U.), H. Negoro, M. Nakajima, K. Fukushima, T. Onodera, K. Suzuki, T. Namba, M. Fujita, F. Honda (Nihon U.), Y. Ueda, M. Shidatsu, T. Kawamuro, T. Hori (Kyoto U.), Y. Tsuboi, A. Kawagoe (Chuo U.), M. Yamauchi, Y. Morooka, D. Itoh (Miyazaki U.), K. Yamaoka (Nagoya U.)
on 5 Nov 2014; 11:30 UT
Credential Certification: Mikio Morii (morii@hp.phys.titech.ac.jp)
Subjects: X-ray, Binary, Neutron Star
MAXI/GSC detected a superburst from the position
consistent with that of a low-mass X-ray binary 4U 0614+091.
The burst was detected during a scan transit at 15:06
on 2014 November 3 (UT) and lasted for at least 9 hours.
The 4-10 keV flux of the burst was approximately 1.7+-0.1 Crab
at the first detection and decayed to
0.44+/-0.06 Crab at the fourth detection at 19:45 (UT).
The flux was not available at the scan transit at 21:18 on November 3 (UT) and
the following 16 scans,
due to obscuration by ISS structures.
A preliminary analysis shows that the energy spectra
during the first (15:06) and the second (16:39) scan transits
are well described by blackbody models with the temperatures of
1.9 +/- 0.2 keV and 1.5 +/- 0.2 keV, respectively.
Using the data of the first, third, and fourth transits
(the flux of the second transit is uncertain because of a
partial data lack),
the exponential decay
time in the 4-10 keV energy band is about 3 hours.
A superburst from this source was once detected
by RXTE/ASM on 2005 March 12 (Kuulkers 2005, ATel #483; Kuulkers et al. 2010, A\&A, 514A, 65).
