Near-IR observations of the QSO BZU J0742+544
ATel #3274; Rajeev R. Jaiswal, Blesson Mathew, Sachindra Naik (Physical Research Laboratory, Ahmedabad, India)
on 12 Apr 2011; 06:00 UT
Credential Certification: Sachindra Naik (snaik@prl.res.in)
Subjects: Infra-Red, Optical, Gamma Ray, TeV, Blazar, Quasar
Following the Fermi LAT detection of a flare in Gamma-Rays (Atel #3196) and the near-infrared observations of the ongoing NIR flare of BZU J0742+5444 (GB6 J0742+5444) (Atel #3261), we observed the intermediate redshift quasar in J and H-bands on 2011 April 10 (MJD = 55661) with the 1.2m telescope (+ NICS with HAWAII-1 infrared array) at Gurushikhar, Mt Abu, operated by Physical Research Laboratory, Ahmedabad, India. The photometric observations were carried out in very clear and photometric sky conditions. Several frames in each of the two J and H-bands were obtained in five dithered positions, offset by typically 30 arcsec from each other. The sky frames were generated by median combining the dithered frames and subtracted from the source frames followed by aperture photometry. On April 10, the J and H-band magnitudes of the object were found to be 13.93 (+/- 0.14) and 13.84 (+/- 0.16), respectively. Though our observation showed the decrease in brightness of the object compared to the earlier observation (with H-band magnitude of 12.591 +/- 0.05 (Atel #3261)), it
is still brighter than the flux value reported in the 2mass survey corresponding to H = 14.705 +/- 0.08. Further monitoring of the source will be carried out from Mt. Abu observatory.
