Multi-band optical observations of an outburst in BL Lacertae
ATel #16810; Mywish Anand (Indian Astronomical Observatory), Ravi Joshi (Indian Institute of Astrophysics), Krishan Chand (Central University of Himachal Pradesh), Vibhore Negi (IUCAA), Jayesh Saraswat (Manipal Center for Natural Sciences, MAHE Manipal)
on 10 Sep 2024; 10:08 UT
Credential Certification: Vibhore Negi (vibhore.negi18@gmail.com)
Subjects: Optical, AGN, Blazar, Quasar
A new outburst was reported in the blazar, BL Lacertae, in the ATel #16806, with the peak brightness of 11.96 magnitude in the R-band. We carried out its multi-band optical observations on the nights of 8th and 9th September 2024, thereby confirming the outburst. The source showed an increasing trend in its R-magnitude values, from 12.72 to 13.0, indicating that the outburst is now receding from its peak state. Two exposures in each U, B, V, R and I filters were taken for an integration time of four minutes each. The obtained apparent magnitudes are given below:
Date: September 8, 2024
| MJD |
Filter |
App. Mag. |
Error |
| 60561.92625332292 |
U |
17.04 |
0.1 |
| 60561.9290708324 |
U |
17.08 |
0.1 |
| 60561.94460819769 |
B |
14.67 |
0.07 |
| 60561.94744900023 |
B |
14.72 |
0.07 |
| 60561.95052377002 |
V |
13.51 |
0.07 |
| 60561.95335299109 |
V |
13.52 |
0.07 |
| 60561.93267161828 |
R |
12.82 |
0.07 |
| 60561.93547754607 |
R |
12.72 |
0.07 |
| 60561.9386965706 |
I |
11.74 |
0.08 |
| 60561.941533425 |
I |
11.65 |
0.08 |
Date: September 9, 2024
| MJD |
Filter |
App. Mag. |
Error |
| 60562.82772171238 |
U |
17.58 |
0.1 |
| 60562.83052749086 |
U |
17.55 |
0.11 |
| 60562.83345024271 |
B |
15.02 |
0.15 |
| 60562.83625601933 |
B |
14.87 |
0.09 |
| 60562.83918471991 |
V |
13.64 |
0.08 |
| 60562.84198464213 |
V |
13.61 |
0.07 |
| 60562.84490739653 |
R |
13.0 |
0.07 |
| 60562.84770160011 |
R |
12.98 |
0.07 |
| 60562.85069936343 |
I |
11.91 |
0.08 |
| 60562.85350027118 |
I |
12.04 |
0.08 |
Further multiwavelength observations are encouraged.
50cm telescope is the new, refurbished and rebuilt robotic telescope at the Indian Astronomical Observatory in Hanle, Leh, Ladakh, India. The region of Hanle is recognised by the IAU as the first dark sky reserve in India.
