TNS Classification Report No. 21061 [ 2025TNSCR1856....1B ]
Date Received (UTC): 2025-05-20 06:43:16 Sender: K. Azalee Bostroem
Group: DLT40
K. Azalee Bostroem, S. Valenti, D. J. Sand, S. W. Jha, M. Lundquist, J. E. Andrews, E. Hoang, M. Shrestha, Y. Dong, D. Janzen, G. Hosseinzadeh, J. Pearson, N. Meza, D. Mehta, A. Ravi, A. Martas, B. Subrayan, L. Kwok report/s a classification of object: SN 2025ktz
Type: SN IIRedshift: 0.011
Remarks: We obtained a spectrum with Binospec on MMT on 2020-05-20 03:26:33 (MJD=60815.14). Based on narrow H alpha in the host spectrum, we find a redshift of 0.011 consistent with that of UGC 08255. Our spectrum shows a blue continuum with shallow P Cygni profile which peaks around 6630, corresponding to H alpha at the host redshift. We therefore classify AT2025ktz as a Type II supernova. Given the relatively deep non-detection, the supernova is likely young, however, the velocity is low (4000-5000 km/s) causing some degeneracy in the template matching.
The following Classification spectrum was provided:
Obsdate: 2020-05-20 03:26:33
Instrument: BINOSPEC
Telescope: MMT Observatory 6.5m
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2025ktz
Date Received (UTC): 2025-05-20 06:43:16 Sender: K. Azalee Bostroem
Group: DLT40
K. Azalee Bostroem, S. Valenti, D. J. Sand, S. W. Jha, M. Lundquist, J. E. Andrews, E. Hoang, M. Shrestha, Y. Dong, D. Janzen, G. Hosseinzadeh, J. Pearson, N. Meza, D. Mehta, A. Ravi, A. Martas, B. Subrayan, L. Kwok report/s a classification of object: SN 2025ktz
Type: SN IIRedshift: 0.011
Remarks: We obtained a spectrum with Binospec on MMT on 2020-05-20 03:26:33 (MJD=60815.14). Based on narrow H alpha in the host spectrum, we find a redshift of 0.011 consistent with that of UGC 08255. Our spectrum shows a blue continuum with shallow P Cygni profile which peaks around 6630, corresponding to H alpha at the host redshift. We therefore classify AT2025ktz as a Type II supernova. Given the relatively deep non-detection, the supernova is likely young, however, the velocity is low (4000-5000 km/s) causing some degeneracy in the template matching.
The following Classification spectrum was provided:
Obsdate: 2020-05-20 03:26:33
Instrument: BINOSPEC
Telescope: MMT Observatory 6.5m
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2025ktz