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The ASCA Results of GRO J1744-28

Published online by Cambridge University Press:  25 May 2016

Mamiko Nishiuchi ,
Yoshitomo Maeda ,
Katsuji Koyama ,
Jun Yokogawa ,
Tadayasu Dotani ,
Kazumi Asai ,
Yoshihiro Ueda ,
Kazuhisa Mitsuda ,
Hajime Inoue  and
Fumiaki Nagase
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Mamiko Nishiuchi
Affiliation:
Department of Physics, Kyoto University, Sakyo, Kyoto, Japan
Yoshitomo Maeda
Affiliation:
Department of Physics, Kyoto University, Sakyo, Kyoto, Japan
Katsuji Koyama
Affiliation:
Department of Physics, Kyoto University, Sakyo, Kyoto, Japan
Jun Yokogawa
Affiliation:
Department of Physics, Kyoto University, Sakyo, Kyoto, Japan
Tadayasu Dotani
Affiliation:
ISAS
Kazumi Asai
Affiliation:
ISAS
Yoshihiro Ueda
Affiliation:
ISAS
Kazuhisa Mitsuda
Affiliation:
ISAS
Hajime Inoue
Affiliation:
ISAS
Fumiaki Nagase
Affiliation:
ISAS
Cherissa Kouveliotou
Affiliation:
Universities Space Research Association

Extract

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We present the ASCA/GIS results of the transient source GRO J1744-28, the bursting X-ray pulsar, for the two times observations about one year apart. (the first and the second observations are on Feb.27th 1996 and Mar.16th 1997 respectively.) Since the discovery of GRO J1744-28 on Dec. 2 1995 with the BATSE observatory (Fishman et al. 1995; Kouveliotou et al.), thousands of Type II X-ray bursts, and sinusoidal pulsations have been observed in the X-ray band. No other source has ever been found to exhibit such unusual characteristics. Following each burst the flux decreases below, and recovers to the pre-burst persistent level (here after the dip) within a few seconds to a few minutes, depending on the total flux of the burst. We examined the spectrum of GRO J1744-28 during each persistent, dip, burst phases at the two observations. This is the first detail study of the spectra (1-10keV band) of GRO J1744-28.

Type
Session 3: Diagnostics of High Gravity Objects with X- and Gamma Rays
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 360 - 361
Copyright
Copyright © Kluwer 1998 

References

Fishman, G.J. et al. (1995), IAUC , 6272,Google Scholar
Kouveiotou, C. et al. (1996), NATURE , 379,Google Scholar