Erratum in ATel#16841: V- and R-band photometry
ATel #16844; Raul Michel, Angel Castro (UNAM), Kevin Alabarta (NYU Abu Dabhi)
on 4 Oct 2024; 21:33 UT
Credential Certification: Angel Castro (acastro@astro.unam.mx)
Subjects: Binary, Neutron Star, Transient
In our previous communication (ATel#16841), the values of the optical photometry conducted on Aql X-1 were omitted. Observations were made during nine different epochs in the V and R bands, with an average of four hours of continuous observation at each epoch. The following table presents the average magnitude of each observation sequence in the respective optical bands.
| Date |
MJD |
Mag V |
Error V |
Mag R |
Error R |
| 2024-09-21 |
60574.21 |
17.58 |
0.04 |
17.08 |
0.04 |
| 2024-09-22 |
60575.21 |
17.60 |
0.03 |
17.05 |
0.04 |
| 2024-09-24 |
60577.21 |
17.34 |
0.01 |
16.85 |
0.03 |
| 2024-09-25 |
60578.15 |
17.12 |
0.01 |
16.61 |
0.01 |
| 2024-09-26 |
60579.21 |
17.12 |
0.01 |
16.59 |
0.01 |
| 2024-09-27 |
60580.23 |
17.04 |
0.01 |
16.51 |
0.02 |
| 2024-09-28 |
60581.20 |
16.83 |
0.01 |
16.33 |
0.02 |
| 2024-09-29 |
60582.22 |
16.85 |
0.01 |
16.30 |
0.01 |
| 2024-09-30 |
60583.20 |
16.68 |
0.01 |
16.18 |
0.01 |
On September 21, 2024 (MJD 60574.21), we measured the object at V = 17.58 ± 0.04 and R = 17.08 ± 0.04. Subsequently, on September 30 (MJD 60583.20), by the end of our observing run, we measured V = 16.68 ± 0.01 and R = 16.18 ± 0.01. Thus, it brightened by 0.90 ± 0.04 magnitudes in both optical bands from the beginning to the end of our observations, indicating an upward trend in the average values presented.
