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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 (aam@astro.caltech.edu)

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 CSS110512:141829+354249 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).

The Catalina light curve 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 14.218.6 18.2 17.9 17.6.
Jun. 23.218.4 18.0 17.7 17.3
Jun. 28.218.7 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.