Swift/Maxi X-ray Transient

Following an alert posted via vsnet-alert on 14th June 2012 that
Swift/MAXI had detected an X-ray transient with a bright optical
counterpart I observed the object with the Faulkes Telescope South on
the same day at magnitude 15.7 R. According to ATel 4149, this
object is suspected to be a black hole candidate Low Mass X-ray
Binary.

Subsequently Alessandro Odasso, who had also commenced observing it
using the Sierra Stars Observatory Network, and had been in contact
with NASA and the discoverers of the object, contacted Richard Miles
and we agreed that it may be worth a short observing campaign to try
and determine its period.

It is located at RA 19h 10m 23.00s and Dec -5d 47m 55.90s.

Suitable comparison stars are:-

CMC14                       RA DEC           r'    V

C1 191023.3-054652 19 10 23.3 -05 46 52.9 14.386 14.930
C2 191020.7-054658 19 10 20.8 -05 46 58.4 14.056 14.560
C3 191024.5-054918 19 10 24.6 -05 49 18.4 13.031 13.572
C4 191028.2-054652 19 10 28.2 -05 46 52.5 13.535 13.762
C5 191011.7-055026 19 10 11.7 -05 50 26.7 14.050 14.255

Note that the preferred comp stars are C4 and C5.

A chart is available here

Please report reduced observations to me at the email address below
using the name Swift J1910.2-0546 when I shall analyse them to see if
we can find a period.

Roger Pickard,
Director VSS
roger.pickard@sky.com