A follw up for ATel number 16349 A Possible Optical Counterpart Discovery of NuStar J 053449+2126.0 with RTT150

ATel #16350; E. N.Ercan (Bogazici University), E. Aktekin Caliskan ( Suleyman Demirel University), M. H.Erkut (Bogazici University), A. Farhan (self employed), E. P.J. van den Heuvel (Amsterdam University)
on 27 Nov 2023; 16:36 UT
Credential Certification: E.Nihal Ercan (ercan@boun.edu.tr)

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A Followup for ATel 16349 The log of our photometric observations, characteristics of the filters used, and magnitude values are as follows: 2022/03/25: with Filter Bessel B, Magnitude 21.32+/-0.91, Wavelengt 433nm, FWHM 114 nm. 2022/12/20: with Filter Bessel B, Magnitude 19.84 +/-0.27, Wavelength 433 nm, FWHM 114 nm. 2022/12/20: with Filter V, Magnitude 18.90+/-0.22, Wavelength 519 nm, FWHM 100 nm. 2022/12/20: with Filter R, Magnitude 18.37+/-0.21, Wavelength 600 nm, FWHM 128 nm. 2022/12/20: with Filter I, Magnitude 18.02+/-0.18, Wavelength 782 nm, FWHM 347nm . The exposure time for each was 900 sec. On the other hand, The log of our spectroscopic observations is as follows: Observation No; Slit centre (alpha: hr, min, sec; delta: ( 0 ‘,’’), Exposure time (sec) 1) 2022/12/20 ; 05 34 49.60; +21 26 01.64 3600 sec 2) 2022/12/23: 05 34 49.60; +21 26 01.64 3600 sec 3) 2022/12/23 : 05 34 49.60; +21 26 01.64 3600 sec 4) 2022/12/23: 05 34 49.60; +21 26 01.64 3600 sec 5) 2022/12/23 : 05 34 49.60; +21 26 01.64 3600 sec Among the possible redshift values, we obtained z=2.2144+/-0.0066 for the Lyman-alpha line that we fitted at its observed wavelength of 3904+/-8 Angstrom. Throughout the observations, the emission lines we identified for z =2.2 (approx.) were Lyman-alpha, Si IV+O IV), N IV), C IV, N III), and absorption line Fe II.