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Following the neutron star transient XTE J1701-462 as it turns into quiescence.

ATEL # 1178; Diego Altamirano, Rudy Wijnands, Nathalie Degennar, Piergiorgio Casella (UvA), Jeroen Homan (MIT), Tomaso Belloni, (INAF/OAB), Sergio Campana (INAF/OAB).
on 11 Aug 2007; 23:52 UT
Distributed as an Instant Email Notice (Transients)
Password Certification: Rudy Wijnands (

Subjects: X-ray, Binaries, Neutron Stars, Transients

Following the latest reports on the outburst of the transient neutron star low-mass X-ray binary XTE J1701-462 (ATel #1144, #1165), we observed the source for 3 times with Swift. Each observation lasted for approximately ~2 ksec. We found that on August 2nd, 6th and 8th the energy spectra is well fitted with power law indices of ~2, ~2.3 and 3.2, respectively, and we obtained unabsorbed fluxes of ~1.4E-10, ~3.2E-11 and ~9.4E-13 erg/cm2/s (2-10 keV). In all cases we kept the column density Nh fixed to 2 x 10^{22} cm^2. These fluxes show that the source has accelerated its decrease in count rate in the last two weeks. We will continue to follow the rapid decay of the source with Chandra observations scheduled for the 12th and 19th of August. Observations at other wavelengths are strongly encouraged. We thank the Swift team for a prompt scheduling of our monitoring observations.

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R. E. Rutledge , Editor
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