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Optical monitoring of IGR J00291+5934

ATel #395; I. Bikmaev, V. Suleimanov, A. Galeev, N. Sakhibullin (KSU/AST), A. Alpar (SU), Z. Aslan, I. Khamitov (TUG), R. Burenin, M. Pavlinsky (IKI), R. Sunyaev (MPA/IKI)
on 24 Jan 2005; 16:03 UT
Credential Certification: M. Revnivtsev (mikej@mpa-garching.mpg.de)

Subjects: Optical, Binary, Neutron Star, Pulsar

We have photometrically monitored the optical transient associated with the accretion-powered millisecond pulsar IGRJ00291+5934 (ATEL352,353,354,363) during the period of December 11, 2004 - January 13, 2005, with Russian-Turkish 1.5-m optical telescope (RTT150) at Bakirlitepe (Antalya, Turkey). The R-band light curve is shown at http://db.rsdc.rssi.ru/IGRJ00291+5934/fig1.jpg Optical flux decay is nearly exponential with e-folding time 5.66+/-0.2 days. The rate of optical flux decay is consistent with the decay rate in 2.5-25 keV X-Ray flux during the first 10-15 days after the burst (Galloway et al.,2005, astro-ph/0501064). Optical brightness variations with amplitude ~ 0.3 mag at timescales of hours were detected when the transient was bright enough (R~19-21 mag). A possible re-brightening of the optical transient was detected ~ 40 days after the burst (January 9-13, 2005). We note, that after the optical transient of SAX J1808.4-3658 (Giles et al., MNRAS, 1999,304,47, R.Wijnands, astro-ph/0501264), this is the second accretion powered millisecond pulsar with an observed decay in the optical.

IGRJ00291+5934 light curve