About DR UMa or the CRTS transient CSS110402:135906+554432
ATel #10220; Lampens, Patricia (Royal Observatory of Belgium, Brussels, Belgium), Van Cauteren, Paul (Humain Observatory, Belgium)
on 28 Mar 2017; 19:48 UT
Credential Certification: Patricia Lampens (firstname.lastname@example.org)
Subjects: Optical, Blazar, Transient
We report differential photometric measurements, both unfiltered (filter clear, C) and
filtered (filter V), obtained at the Humain station of the Royal Observatory of Belgium
(longitude = 5.254, latitude = +50.192, elevation = 280 m) of the CRTS transient CSS110402:135906+554432 (Drake et al. 2009, ApJ 696, 870), which is also identified
as DR UMa. The instrumentation is a 16-inch Schmidt-Cassegrain telescope equipped
with a Moravian G2-3200 CCD camera.
Six measurements were collected relative to the comparison star with coordinates
RA = 13h58m51.39s and Dec = +55Â°44'11.2'' (mag V equals 17.38 mag, B-V equals 0.73).
During February, 2017, our single data point corresponds to a normal state of the
transient. More recently, we measured a brightening of the order of about one
magnitude above its normal value (Table 1). For details, see Fabrika et al.
Table 1. Observational data
Sequence Name Date Julian Date mag Filter
nr1 DR UMa 2017-02-14 2457799.469 19.085 C
nr2 DR UMa 2017-03-25 2457838.355 18.002 C
nr3 DR UMa 2017-03-26 2457839.387 17.818 V
nr4 DR UMa 2017-03-26 2457839.357 17.961 C
nr5 DR UMa 2017-03-27 2457840.336 18.054 C
nr6 DR UMa 2017-03-27 2457840.358 18.087 V