Optical follow-up of the flaring blazar TXS 1515-273
ATel #12575; Nibedita Kalita, Ram Kesh Yadav, Utane Sawangwit (NARIT, Thailand)
on 13 Mar 2019; 23:52 UT
Credential Certification: Nibedita Kalita (nibeditaklt1@gmail.com)
Subjects: Optical, AGN, Blazar
Following the announcement of gamma-ray flaring activity of the blazar TXS 1515-273 in ATel #12532 by S. Cutini, we performed photometric follow up observations of the source during 2019/02/28 â 2019/03/07 with a 4K x 4K CCD camera mounted on the 0.7m Thai Robotic Telescope at Springbrook Observatory (TRT-SBO), Queensland, Australia. The source has shown enhanced activity at other wavelengths as well (ATels #: 12537, #12538, #12552, #12565, #12570).
Our observations consist of 50 x 200s exposures in Johnson V filter, taken under good observing conditions. After bias, flat field, and cosmic ray corrections, aperture photometry was performed on each image frame with DAOPHOT package of IRAF. For zero point correction reference star was taken from the Tycho catalogue (Hog et al., 2000) located in the same field of view. During the observing period, the brightness varied by a maximum value of 0.42 magnitude. Photometric errors from individual images range from 0.03 to 0.08 magnitudes. The resultant magnitudes corrected for Galactic extinction (Schlafly & Finkbeiner 2011) for different nights are listed in the table below:
| UT Date |
MJD |
V |
| 2019-02-28 |
58542.6 |
15.17 |
| 2019-03-01 |
58543.6 |
15.21 |
| 2019-03-03 |
58545.6 |
15.08 |
| 2019-03-04 |
58546.6 |
15.16 |
| 2019-03-05 |
58547.6 |
15.11 |
| 2019-03-07 |
58549.6 |
15.14 |
