Erratum to the ATel #16243: Detection of strong QPO (~ 1.4 Hz) at hard X-rays (> 40 keV) with AstroSat during 'unusual' peak of black hole transient Swift J1727.8-1613
ATel #16244; Tilak Katoch (TIFR, Mumbai), H. M. Antia (CEBS & TIFR, Mumbai), Anuj Nandi (U R Rao Satellite Centre, Bengaluru), Parag Shah (TIFR, Mumbai)
on 14 Sep 2023; 16:30 UT
Credential Certification: Tilak Katoch (tilak@tifr.res.in)
Subjects: X-ray, Black Hole
The title and author field in the Atel#16243 was erroneously interchanged.
The correct title in the Atel#16243 is "Detection of strong QPO (~ 1.4 Hz) at hard X-rays (> 40 keV) with AstroSat during 'unusual' peak of black hole transient Swift J1727.8-1613" and authors are "Tilak Katoch (TIFR, Mumbai), H. M. Antia (CEBS & TIFR, Mumbai), Anuj Nandi (U R Rao Satellite Centre, Bengaluru), Parag Shah (TIFR, Mumbai)."
The observation time was missing, which is now mentioned below:
"The flux of this source was around 6 Crab during the AstroSat observation on 8th September, 2023 with start time 2023-09-08T01:39:57 UT and end time 2023-09-09T00:25:00 UT having the exposure of ~ 31 ksec."
In the paragraph, the uncertainties were not defined which are as follows:
"The power spectral modeling reveals a strong detection of LFQPO at 1.382 +/- 0.001 Hz (Q = 6.59 +/- 0.12, rms = 5.7 +/- 0.1%) along with weak signature of harmonic at 2.78 +/- 0.05 Hz (Q = 1.05 +/- 0.03). The total rms variability is estimated to be 20.1 +/- 1.9 % in the frequency range of 0.01 Hz to 50 Hz."
Our sincere apologies for errors in earlier report and inconvenience caused. We thank R. E. Rutledge, Editor-in-Chief, for bringing these to our attention.
