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Continued RXTE observations of GRO J1655-40

ATel #433; J. Swank (GSFC) and C. Markwardt (UMD/GSFC)
on 1 Mar 2005; 13:12 UT
Credential Certification: Jean Swank (swank@milkyway.gsfc.nasa.gov)

Subjects: X-ray, Binary, Black Hole, Transient

Referred to by ATel #: 434, 436, 437

GRO J1655-40 has been observed with the RXTE pointed instruments each day during Feb 21-Mar 1. The flux has risen only slowly during this period: The 2-10 keV and 10-60 keV flux fluxes on Feb 21.9 were 8.4 and 16.7 mCrab, respectively, and on Feb 27.9 were 17.1 and 36.1 mCrab. During a period of 3 hr Feb 27.96-28.10 there was a sequence of dips by as much as 50%, a phenomenon discovered during 1997 observations (Kuulkers et al. 1998, ApJ, 494, 753).The flux Mar 1 was the same as that of Feb 26, confirming the plateau noted for the INTEGRAL data (ATEL #432). Most of the flux has been in a power law of index 1.66+/- 0.05. Outside the dips at least, no iron line emission is required in the fits.