GRO J1655-40 rapidly evolving

Details GRO J1655-40 rapidly evolving GRO J1655-40 rapidly evolving

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005atel..440....1h&link_type=abstract

The Astronomer's Telegram, #440

Astronomy and Astrophysics

Astronomy

11

X-Ray, Request For Observations, Binaries, Black Holes, Transients

Scientific paper

Daily RXTE/PCA observations of GRO J1655-40 show that the source is
rapidly evolving. Between March 5.7 (ATel #436) and March 10.7 the 2-25 keV flux gradually increased by a factor of 5.2, to 8.2e-9 erg/s/cm^2, with the spectral power-law index increasing from ~1.5 to ~1.7 and the QPO frequency from 0.31 Hz to 2.3 Hz. On March 11.7 the flux had suddenly increased by a factor of 3.2 in a single day, to 2.6e-8 erg/s/cm^2.

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