INTEGRAL observes fading of GRO J1655-40 above 20 keV

Details INTEGRAL observes fading of GRO J1655-40 above 20 keV INTEGRAL observes fading of GRO J1655-40 above 20 keV

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005atel..442....1s&link_type=abstract

The Astronomer's Telegram, #442

Astronomy and Astrophysics

Astronomy

1

X-Ray, Gamma Ray, Binaries, Black Holes

Scientific paper

We have observed a decrease in the the hard X-ray flux (above 20 keV) from the black hole binary GRO J1655-40, of about a factor of two (in four days), using INTEGRAL. This object has been observed for ~12 ksec approximately every 3 days since 17 Feb 2005 during the INTEGRAL Galactic Bulge Monitoring observations ( ATel #438 ). In the latest observation, on MJD 53444.2 (15 March 2005), the measured flux in the ISGRI instrument was ~18 and ~5 cps in the 20--60 and 60--150 keV bands respectively.

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