Fermi J1418+3541 = CSS110512:141829+354249
ATel #4645; A. A. Mahabal, A. J. Drake, S. G. Djorgovski, M. J. Graham, R. Williams, C. Donalek (Caltech), John Greaves (UK), J. Prieto (Carnegie Obs), M. Catelan (PUC), E. Christensen (Gemini Obs), E. C. Beshore, S. M. Larson (LPL/UA)
on 12 Dec 2012; 21:33 UT
Credential Certification: Ashish Mahabal (firstname.lastname@example.org)
Subjects: Optical, Blazar, Variables
Referred to by ATel #: 4750
Recently, Dutka et al. (2012, ATEL#4643) noted the detection of gamma-ray point source Fermi J1418+3541.
They find the source to be at RA=14:18:31, Dec=+35:41:23 and associate it with radio source NVSS J141828+354250
and detect it as a steep spectrum X-ray source in SWIFT data.
The NVSS detection is coincident with the highly variable source
that was discovered in outburst by Catalina Real-time Transient Survey (CRTS) on May 12th 2011 UT.
CRTS immediately identified the source as a likely blazar based on the nature of the
optical variability and coincidence with FIRST radio survey source (FIRST J141828.5+354249,
as well as radio detection in the NVSS survey).
of the source shows that the object was in a quiescent state at V~19.9 between 2005-01-18 and 2010-06-22
before going into an outburst that brightened to peak of V=17.3 on 2012-03-30.
Optical follow-up of the source was obtained with the Palomar 1.5m
on May 14th, Jun 23rd, and Jun 28th 2011 with the following results:
|Date (UT)|| g'|| r'|| i' ||z'|
|May 14.2||18.6|| 18.2|| 17.9|| 17.6.
|Jun. 23.2||18.4|| 18.0|| 17.7|| 17.3
|Jun. 28.2||18.7|| 18.4|| 18.0|| 17.2
An optical spectrum of the source was obtained on Jun 26th 2011 with the Palomar 5m telescope+DBSP
and revealed a blue continuum source consistent with the initial blazar identification.
Additional blazar candidates discovered by CRTS can be found at http://nesssi.cacr.caltech.edu/catalina/AllBlaz.html
as well as through links on the CRTS website.
Photometric measurements for all 200 million sources covered by the Catalina Surveys
Data Release 1 (CSDR1) are freely available.