Letter | Published:

Simultaneous IR and X-ray burst observation of Ser X-1

Abstract

It has been suggested1,2 that the very bright IR bursts1,3 observed from the Rapid Burster (MXB 1730–335) are due to Type I X-ray bursts4. When the bright IR bursts were detected, unfortunately there was no simultaneous X-ray coverage. Therefore, it is not known whether the IR bursts are associated with Type I or Type II bursts or with neither one. The suggestion1,2 is only based on the low recurrence rate of the IR bursts. If the suggestion is correct, similar bright IR bursts may, in general, accompany Type I X-ray bursts1,2. This paper investigates this possibility for one specific case. During the 1977 coordinated worldwide burst watch5, simultaneous X-ray and IR observations were made. On UT June 17, 00 h 00 min 25s, a Type I X-ray burst was observed, which was almost certainly emitted by Ser X-l (MXB 1837 + 05, 4U1837 + 04) (ref. 6). Simultaneous IR observations failed to detect any bursts. We report here on these observations.

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