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New Outburst of GRO J1655-40?

ATel #414; C. B. Markwardt (U. Maryland & NASA/GSFC) & J. H. Swank (NASA/GSFC)
on 19 Feb 2005; 21:15 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Craig B. Markwardt (craigm@lheamail.gsfc.nasa.gov)

Subjects: X-ray, Request for Observations, Binary, Black Hole, Transient

Referred to by ATel #: 415, 417, 418, 419, 438, 485, 487, 607, 608, 609

RXTE PCA bulge scan observations on 2005 Feb 17.99 (UT) have detected emission consistent with coming from the black hole transient GRO J1655-40. The flux in the 2-10 keV band was 4.1 +/- 0.6 mCrab. The source was not detected in a previous observation on Feb 10.77 (2-10 keV flux measurement of 0.3 +/- 0.3 mCrab).

A dedicated scan to confirm the position and look at the growth rate is planned for Feb 20.