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NIR follow-up of PKS 0208-512


Nesci, R and Kadler, M and Ojha, R and Pursimo, T and Tosti, G and Blanchard, JM and Lovell, JEJ, NIR follow-up of PKS 0208-512, The Astronomer's Telegram pp. 3421. (2011) [Letter or Note in Journal]


The source PKS 0208-512 is being monitored by the TANAMI project ( in NIR with the REM telescope ( The source underwent a Gamma Ray flare detected by Fermi-LAT on May 11, 2011 (JD 55690, Atel #3338) when the source was not observable from the ground. We recorded J=15.68 (+/-0.14) on JD 55660 (one month before the Gamma-ray flare) using a sequence of 10 comparison stars taken from the 2MASS for differential photometry: this value is in agreement with the SMARTS data ( We observed the source quite brighter, at J=14.81 (+/-0.08) on JD 55716 (26 days after the gamma-ray flare): magnitudes in the other NIR bands were H=14.02 ±0.14 and K=13.28 ±0.20, giving colors similar to those reported in the 2MASS point source catalogue (Cutri et al. 2003) and typical of a BL Lac object. It is therefore likely that the Gamma-ray flare had an optical counterpart, as e.g. in the case of CGRaBS J0211+1051 (ATel #3127). Radio monitoring at a frequency of 6.7 GHz with the Ceduna radio telescope in South Australia shows no evidence for any activity up to now ( Further observations are encouraged.

Item Details

Item Type:Letter or Note in Journal
Keywords:Radio, Infra-Red, AGN, Blazar
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Blanchard, JM (Mr Jay Blanchard)
UTAS Author:Lovell, JEJ (Dr Jim Lovell)
ID Code:73348
Year Published:2011
Deposited By:Mathematics and Physics
Deposited On:2011-09-27
Last Modified:2011-09-27

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