Superburst with Outburst from EXO 1745-248 in Terzan 5 with MAXI
Motoko Serino (1), Tatehiro Mihara (1), Masaru Matsuoka (1), Satoshi, Nakahira (1), Mutsumi Sugizaki (1), Yoshihiro Ueda (2), Nobuyuki Kawai (3),, and Shiro Ueno (4) ((1) RIKEN, (2) Kyoto University, (3) Tokyo Institute of, Technology, (4) JAXA)

TL;DR
This paper reports the detection of a superburst from EXO 1745-248 in Terzan 5 using MAXI, analyzing its spectral properties, decay, and subsequent outburst, providing insights into superburst phenomena in low-mass X-ray binaries.
Contribution
First detection of a superburst from EXO 1745-248 with detailed spectral and temporal analysis, linking superburst activity to subsequent outburst behavior.
Findings
Superburst characterized by exponential decay with 0.3-day e-folding time.
Spectral analysis shows blackbody radiation with temperatures of 2.2 keV and 1.2 keV.
Follow-up outburst occurred 28 hours after the superburst, lasting 5 days.
Abstract
MAXI/GSC detected a superburst from EXO 1745-248 in the globular cluster Terzan 5 on 2011 October 24. The GSC light curve shows an exponential decay with an e-folding time of 0.3 day. The spectra are consistent with the blackbody radiation, whose temperature is 2.2 keV and 1.2 keV at MJD 55858.56 and 55859.20, respectively. The fluence is erg in 2-20 keV assuming 8.7 kpc distance. The sphere radius of the blackbody and its luminosity are estimated to be 6.2 km and erg s, respectively, from the spectral fitting at the flux peak. Those e-folding time, temperature, softening, fluence, and radius are typical of superbursts from the low-mass X-ray binaries. The superburst was followed by an outburst 28 hours after the superburst onset. The outburst lasted for 5 days and the fluence was erg. The instability of the accretion…
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