A. J. Castro-Tirado, V. Casanova, B.-B. Zhang, J. C. Tello, Y. Hu
(IAA-CSIC, Granada), M. D. Caballero-Garcia (ASU-CAS), V. V. Sokolov, V.
V. Vlasjuk, A. F. Valeev (SAO-RAS), E. Pian (SNS-Pisa), S. Jeong (SKKU),
S. R. Oates (Warwick), S. Geier and D. P��rez (GRANTECAN), report:
We observed the transient PS17yt (Chambers et al., LVC GCN 20512) with
the 1.5m OSN telescope at Sierra Nevada (Spain) in imaging mode and with
the 10.4m GTC telescope located at La Palma (Canary Islands, Spain)
equipped with the OSIRIS spectrograph. The OSN images were gathered on
Jan 24, 21:54 UT, whereas the spectroscopic observations were carried
out starting on Jan 25, 00:50 UT. The PS17yt spectrum covering the range
3700-10000 A shows that this transient is a type Ia SN about 1 week
before maximum at a redshift z~0.026.
We acknowledge excellent support from the GTC staff.