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Optical/IR Confirmation of Outburst of Aql X-1

ATEL # 1080; D. Maitra (Univ. of Amsterdam), C. Bailyn (Yale Univ.)
on 22 May 2007; 16:43 UT
Distributed as an Instant Email Notice (Transients)
Password Certification: Dipankar Maitra (

Subjects: Infra-Red, Optical, Binaries, Neutron Stars, Transients

Ongoing optical/IR monitoring of Aql X-1 with the SMARTS 1.3m telescope and ANDICAM instrument at CTIO show a steady rise over the past week. This confirms the INTEGRAL detection of the beginning of a new outburst of the source as reported by Rodriguez et al. (ATEL #1079). Our most recent data show that on May 22, 7.8h UTC (mid-exposure) the source was at R=17.2, J=15.8, compared to mean quiescent values of R=18.8, J=16.7. These magnitudes include the unrelated star 0.5" away (Chevalier et al. 1999 A&A 347, L51). SMARTS light curves can be seen at . Multiwavelength observations are highly encouraged.

OIR light curve of Aql X-1

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