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Aquila X-1 optical rise

ATel #2303; S. A.Ilovaisky, C. Chevalier (Observatoire de Haute-Provence
on 19 Nov 2009; 11:21 UT
Credential Certification: Sergio A. Ilovaisky (sergio.ilovaisky@oamp.fr)

Subjects: Optical, X-ray, Binary, Neutron Star, Transient

Referred to by ATel #: 2317

Analysis of CCD images obtained on 2009 November 18.75 UT by J.Taupenas with the 1.2-m Haute-Provence reflector shows the orbital phase-corrected magnitude of the object has brightened in the V band by 0.3 mag since November 12. The actual counterpart (star 'e' of Chevalier et al. 1999, Astr.Ap. 347, L51) has thus risen in V by 3.7 magnitudes above its quiescent value. These measurements, together with the increase in the RXTE/ASM 2-10 keV flux and the decrease in the SWIFT/BAT 15-50 keV flux, confirm the source is undergoing a hard/soft transition (ATel #2302).