Observed: 3, 5, 16, 17, 20 July, 4, 5 August 2005
4 July 2005
Updated: 17 August 2005
Time-series for this X and gamma-ray transient, which may be a
black hole candidate, are presented.
SwiftJ1753.5-0127 was detected as a new, bright, variable gamma-ray and
X-ray source by the Swift satellite on 29 June 2005 (The Astronomer's
Telegram ATel 546, 547, 550). A mag 15 optical counterpart was found on
2 July 2005 (Atel 549). Swift data shows "a 0.6 Hz QPO with a shape typically
seen in BH Candidates" (ATel 550).
SwiftJ1753.5-0127 was observed with a 203mm f/6.3 SC telescope, a SBIG
ST7E camera (KAF401E CCD) and a Clear filter. 73 images were obtained
on 3-4 July 2005 between 22:06 TU and 02:30 TU. Each exposure lasts 200
seconds (except the first one). 5 images were obtained that followed.
The comparison star is UCAC2 31 365 377 with an assumed unfiltered magnitude
of 14.000. The check star is UCAC2 31 363 373 with an average measured
magnitude of 16.053 (standard deviation 0.094).
An example of an image:
Red ticks: SwiftJ1753.5-0127, Yellow square: the comparison star, Blue
ticks: the check star.
The following light curve was obtained:
Red: SwiftJ1753.5-0127, Blue: the check star shifted by +0.2 mag.
The error bars are the 1-sigma statistical uncertainties.
The brightness appears to be constant at 15.788 mag, standard deviation
More observations found the object to be steady:
Telescope and camera configuration.
Software and computer configuration.