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OIR decline in GRO J1655-40

ATel #485; Michelle Buxton, Charles Bailyn (Yale University)
on 11 May 2005; 15:29 UT
Credential Certification: Michelle Buxton (buxton@astro.yale.edu)

Subjects: Infra-Red, Optical, Binary, Black Hole, Transient

Referred to by ATel #: 487, 489, 496

We have been monitoring the black-hole X-ray transient GRO J1655-40 in optical and infrared bands since the beginning of the current outburst (ATEL #414, 418). Observations are made daily (when possible) with the SMARTS 1.3m telescope at CTIO using the ANDICAM instrument. For the past 40 days, GRO J1655-40 remained at a steady magnitude of B ~ 16.4, V ~ 15.1, I ~ 13.2, J ~ 11.9 and K ~ 11.1. However, recent data taken on MJD 53499.2, MJD 53500.2 indicate that GRO J1655-40 is starting to decline, with a drop in magnitude of dB ~ 0.8, dV ~ 0.7, dI ~ 0.7, dJ ~ 0.6 and dK ~ 0.5. Our latest light curves can be seen at : http://www.astro.yale.edu/buxton/smarts/light_curves/oir_gro.jpg

GRO J1655-40 OIR light curves