Optical flare of an X-ray source XMMSL1 J014956.7+533504
ATel #3896; S. A. Korotkiy (Ka-Dar Obs.) and K. V. Sokolovsky (ASC Lebedev/SAI MSU)
on 30 Jan 2012; 12:57 UT
Credential Certification: Kirill Sokolovsky (kirx@scan.sai.msu.ru)
Subjects: Optical, Request for Observations, Cataclysmic Variable, Star
A bright (unfiltered magnitude 12.8) optical flare was detected on
2012 January 29 at position 01:49:56.77 +53:35:01.8 (+/-0.5", J2000)
coinciding with an X-ray source listed in the XMM-Newton slew survey
catalog XMMSL1 J014956.7+533504 (Saxton et al. 2008, A&A, 480, 611),
an optical object USNO-B1.0 1435-0053799
(B1mag=15.96, R1mag=14.86; Monet et al. 2003, AJ, 125, 984), and a
near-infrared object 2MASS 01495682+5335017 (J=13.717 +/-0.025;
H=13.341 +/-0.037; Ks=13.160 +/-0.033 Skrutskie et al. 2006,
AJ, 131, 1163). Inspection of previous images of this field revealed
that the object was also detected on images from January 26, 27,
and 28, but not on images from January 24 and 25.
Date JD mag. err.
2012-01-24.6944 2455951.1944 >14.5
2012-01-25.6990 2455952.1990 >14.5
2012-01-26.7913 2455953.2913 14.34 0.13
2012-01-27.7485 2455954.2485 13.73 0.08
2012-01-28.6859 2455955.1859 13.22 0.05
2012-01-29.7041 2455956.2041 12.80 0.03
Visual inspection reveals that the object is also visible on some of our
archival images but is below the detection limit of our system (~14.5m),
its brightness at these epochs is consistent with the one listed
in the USNO-B1.0 catalog.
The observations were obtained with a wide-field survey camera
(F=135mm f/2.0 telephoto lens equipped with ST8300M CCD) operated by
Ka-Dar Observatory at Karachay-Cherkessia (MPC code C32), Russia.
The instrumental magnitude scale is calibrated using V magnitudes
of Tycho-2 (Hog et al., 2000, A&A, 355L, 27) stars in the field of view.
Follow-up observations are needed to determine the nature of this
flaring object.
