OIR decline in GRO J1655-40

Details OIR decline in GRO J1655-40 OIR decline in GRO J1655-40

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005atel..485....1b&link_type=abstract

The Astronomer's Telegram, #485

Astronomy and Astrophysics

Astronomy

5

Infra-Red, Optical, Binaries, Black Holes, Transients

Scientific paper

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.

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