Bibcode
                                    
                            Linares, M.; Altamirano, D.; Degenaar, N.; Wijnands, R.
    Bibliographical reference
                                    The Astronomer's Telegram, #2264
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                        10
            
                        2009
            
  Citations
                                    2
                            Refereed citations
                                    2
                            Description
                                    After an outburst that lasted more than 2.3 years (starting around  June
12th., 2007; Palmer et al., ATel #1113), the neutron star  transient and
atoll source 4U 1608-52 has returned to quiescence. The  source was last
detected by Swift-BAT, RXTE-PCA and RXTE-ASM on  September 14th. (~0.006
BAT c/s/cm2), September 19th. (~3.5 mCrab) and  October 5th. (~1.4 ASM
c/s), 2009, respectively.         We obtained daily Swift-XRT
observations since October 20th.