{
  "bibcode": "2011GCN.12267....1G",
  "body": "Ersin Gogus (Sabanci Univ. Istanbul) and Chryssa Kouveliotou (NASA/MSFC) \nreport on behalf of a larger team:\n\nRXTE/PCA observed the new source, Swift J1834.9-0846 (D'Elia et al. GCN\nCirc. 12253, Guiriec et al. 12255) on 2011 August 9-10, for a net exposure\ntime of 9.7 ks. We performed a timing analysis using the barycentered photon\narrival times in the 2-10 keV band and detected a coherent pulsation at\n0.402853(2) Hz which corresponds to a spin period of 2.482295 s. Note that\nan earlier PCA observation on 2011 August 9 of the same field with a 3.4\nks exposure did not reveal the pulsed signal clearly but it does confirm\nthe signal at a consistent frequency. The pulse profile shows a broad structure\ncovering about 50% of the spin phase with an evidence of a less significant\nand shorter second structure. This is the only pulsed signal detected within\nthe 1 degree RXTE field of view. To confirm the association of this pulsar\nwith Swift J1834.9-0846, we also analyzed the Swift/XRT data. We see the\nsignal at the same frequency in the XRT observation of 2011 August 9, but\nat lower significance. The association of the RXTE pulsar with Swift J1834.9-0846\nthus needs to be unambiguously confirmed with further longer XRT exposures\nor with other low-background X-ray instruments, such as Chandra.",
  "circularId": 12267,
  "createdOn": 1312982505000,
  "email": "chryssa.kouveliotou@nasa.gov",
  "subject": "RXTE Discovery of the Spin Period of Swift J1834.9-0846",
  "submitter": "Chryssa Kouveliotou at MSFC  <chryssa.kouveliotou@nasa.gov>"
}