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Spectroscopic follow-up of flaring blazars from CRTS

ATEL # 1952; A.A. Mahabal, S.G. Djorgovski, A.J. Drake, M. Graham, R. Williams, W. Max-Moerbeck, J. Richards (Caltech), A. Myers (UIUC), G. Pooley (Cavendish Lab, Cambridge), V. Mohan, A. N. Ramaprakash, A. Kembhavi, G. Devangan (IUCAA), E. Beshore, S.M. Larson, A. Boattini (UA/LPL), E. Christiansen (Gemin Obs.)
on 6 Mar 2009; 7:55 UT
Password Certification: Ashish Mahabal (

Subjects: Radio, Optical, AGN, Quasars, Transients, Variables

We report spectroscopic observations using the Double Beam Spectrograph at the Palomar 200-inch telescope of three transients from Catalina Sky Survey. The observations were carried out on 25 Feb 2009 UT.
ID Detection DateRADecVOEvent ID Redshift
CSS090102:112403+233646 2009-01-02 UT 11:08:48 11:24:02.69 23:36:46.2 901021230574116817 2.14
CSS090214: 101052-020020 2009-02-14 UT 10:02:09 10:10:51.71 -02:00:19.9 902140010554111683 0.89
CSS090120:085010-121335 2009-01-20 UT 08:16:38 08:50:09.63 -12:13:35.3 901200120474150650 0.57

As reported in ATEL #1890, CSS090102:112403+233646 is a known radio source. We will separately report the radio monitoring of it. The redshift was determined using Ly-alpha and C IV lines.

CSS090120:085010-121335 is known to have gone through phases of optical flaring before (1997IAUC.6639B...1H)

We also have additional radio epochs for CSS090214:101052-020020. Those data will be updated at the links given below.

The discovery data, CSS lightcurve and finding charts for these sources are posted at the following VOEventNet webpages:

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates