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Outburst of Aql X-1 as observed by RXTE and Swift

ATEL # 2850; Sabyasachi Pal (ICRAR-UWA)
on 20 Sep 2010; 16:45 UT
Password Certification: Sabyasachi Pal (

Subjects: X-ray, Request for Observations, Binaries, Neutron Stars, Transients, Stars
Referred to by ATEL #: 2871, 2891, 2902, 2911

All Sky Monitor (ASM) on-board Rossi X-ray Timing Explorer and Burst Alert Telescope (BAT) on-board Swift detected an outburst of low-mass X-ray binary Aql X-1. The source re-brightened after an outburst in July 2010 (ATEL #2742, #2744, #2748).
The outburst started near MJD 55440 (1st Sept 2010) and right now, in 2-10 keV, the source is near its peak with ASM count rate 27.75 counts/s (~370 mCrab) recorded on MJD 55455.16 (UT 16.16 Sept 2010). BAT recorded peak in 15-50 keV on MJD 55450 (UT 11 Sept 2010) with 0.027+-0.007 counts/sec rate and on the next day the source count rate rapidly fall near its quiescent value indicating transition to softer state.
Further multi wavelength follow-up of the event is encouraged.
Swift/BAT transient monitor data is provided by the Swift/BAT team and ASM data is provided by ASM/RXTE team.

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates