Faulkes Monitoring of X-ray Binaries

For a discussion of this project, please see Lewis et al. 2008. As well as the FT (optical) monitoring as detailed below, data on XRBs are available from the following high energy missions. Some images do not display in best resolution - to see the full image, use 'Right click -> view image'.

Swift BAT

Swift XRT




Below are some light curves of XBs from the Faulkes Telescope North and South. If you are interested in using the data please email dave.russell5 [at] gmail.com or fraser.lewis68 [at] gmail.com 

FT North Targets - sources are ordered by Right Ascension

Source Name Type  First Observed Comments
IGR J00291+5934  AMXP  Aug 2007 A strange double-peaked outburst from this rapidly rotating pulsar
GRO J0422+32 BH  Jan 2006 Intrinsic variability present
4U 0614+09 ** NS (MQ)  Jan 2006 Persistent and variable jet source
A 0620-00 BH  Jan 2006 Intrinsic variability present
XTE J1118+480 BH (MQ)  Jan 2005 Shows variability in quiescence
H1705-250  BH  Feb 2006  
GRO J1719-24  BHC  Feb 2006   
Swift J1753.5-0127  ?  Apr 2010  
XTE J1859+226  BHC (MQ)  Feb 2006 Intrinsic variability present
Aql X-1 **  NS   Apr 2006 Several outbursts since monitoring commenced
4U1957+11 **  BHC  Apr 2006 Intrinsic variability present correlated with X-ray flux
GS 2000+25   BH  Apr 2006  
V404 Cyg  BH  Apr 2006 Intrinsic variability present - outburst in summer 2015
XTE J2123-058 **  NS  Jun 2007 Not active since monitoring commenced

** Some observations taken with FT South 

FT South Targets - sources are ordered by Right Ascension 

 Source Name Type    First Observed Comments 
MAXI J0556-332 NS  Jan 2011 Newly discovered LMXB
XTE J0929-314  AMXP  Dec 2007  
GRS 1009-45  BH  Dec 2007 Not active since monitoring commenced
GRS 1124-68  BH  Dec 2007 Long-term variations in quiescence
Swift J1357.2-0933  ?  Feb 2011  
GS 1354-64  BH IMXB  Jan 2008 BH in outburst summer 2015
Cen X-4  NS  Feb 2008 Not active since monitoring commenced
MAXI J1535-571  BHC  Sep 2017 Newly discovered BH candidate
4U1543-47  BHC IMXB  Feb 2008 Not active since monitoring commenced
MAXI J1543-564  BHC  May 2011 BH transient
AX J1549.8-5416  CV  Sep 2015  
XTE J1550-564 BH (MQ)  Feb 2008 Intrinsic variability present
4U1608-52  BH (MQ)  Feb 2008 Several outbursts since monitoring commenced
4U 1630-472  BH  Jan 2008  
XTE J1650-500  BH (MQ)  Feb 2008  
GRO J1655-40  BH IMXB (MQ)  Feb 2008 Band-correlated variability in quiescence
MAXI J1659-152 **  BHC  Sep 2010 New BH candidate
GX 339-4  BH (MQ)  Sep 2007 Several outbursts of varying scales
IGR J17091-3624  BH  Apr 2011 New BH transient
XTE J1728-295 **  ?  Sep 2010 Faint X-ray transient
IGR J17329-2731  ?  Aug 2017  
SWIFT J174510.8-2624  BHC  Sep 2012  X-ray transient
H1743-322  BHC  Feb 2008  
XTE J1752-223  BHC  Mar 2010 Newly discovered (2009) BH transient
SAX J1808.4-3658  AMXP  Feb 2008  
XTE J1814-338  AMXP  Feb 2008  
MAXI J1836-194  BHC  Aug 2011  
V4641 Sgr **  BH (MQ)  Sep 2007 Band-correlated variability in quiescence
HETE J1900.1-2455  AMXP  Feb 2008 Still in outburst
MAXI J1910-057  BHC  May 2014  

** Some observations taken with FT North

BH = Black Hole, BHC = Black Hole Candidate, IMXB = Intermediate-Mass X-Ray Binary, MQ = Microquasar,

AMXP = Accreting Milli-second X-ray Pulsar, NS = Neutron Star, ? = Unknown.

Other Sources 

LSI +61 303 has small, long-term variations and a tentative dip around the time of a SGR-like burst from that region. Our ATel on this is here.  

Here is the info for XTE J1856+053, which we did not detect.











Older Information

We've been monitoring GX 339-4 since 2007; throughout some mini-outbursts and a full outburst in 2010-2011. 

The new LMXB (possibly a neutron star system) MAXI J0556-332 is now also being monitored. See our ATel here.

The new transient Swift J1357.2-0933 is now also being monitored.

The new black hole transient IGR J17091-3624 is now also being monitored.

The black hole candidate LMXB MAXI J1659-152 is also being monitored. See our ATels here and here.

Here's an updated finding chart for the new black hole transient MAXI J1543-564 (see our initial ATel here).

The milli-second X-ray pulsar IGR J00291+5934 had a double peaked outburst in 2008. See our ATels here and here and our A&A publication here.

Outbursts of Aql X-1. See our ATels from September 2007 here, March 2009 here, November 2009 here and September 2010 here.

XTE J1752-223 is a new (2009) black hole transient; our monitoring produced this ATel

4U 1957+11: intrinsic variability present, which is correlated with the X-ray flux. This work has been published in MNRAS and is here.

We monitored the field of the faint X-ray transient XTE J1728-295 (IGR J17285-2922) to search for the optical counterpart; see our ATels here and here.

The milli-second X-ray pulsar SAX J1808.4-3658 was also in outburst.

HETE J1900.1-2455 is in outburst

4U 1608-52 has had a number of outbursts

4U 0614+09 is persistent and variable

Sources in quiescence:

XTE J1118+480 shows variability in quiescence

GRS 1124-68 seems to have long-term variations in quiescence (de-reddened magnitudes)

V4641 Sgr shows band-correlated variability in quiescence

GRO J1655-40 shows band-correlated variability in quiescence

A0620-00: intrinsic variability present

GRO J0422+32: intrinsic variability present

XTE J1550-564: intrinsic variability present

XTE J1859+226: intrinsic variability present

V404 Cyg: intrinsic variability present

4U 1543-47 is not active at the moment

Cen X-4 is not active at the moment

GRS 1009-45 is not active at the moment

GS 1354-64 is not active at the moment

XTE J2123-058 is not active at the moment

Old stuff that hasn't been calibrated properly:

GS 2000+25

H 1705-250