VizieR Online Data Catalog: Type Icn SN2021csp photometry & spectra (Perley+, 2022)

SN 2021csp (internally designated ZTF21aakilyd) was first detected in an i-band image obtained on 2021 February 11 (MJD59256.4766) as part of the ZTF high-cadence survey (Bellm+ 2019PASP..131f8003B).

The Zwicky Transient Facility (ZTF) is a combined public and private time-domain optical sky survey, using a 47deg² field-of-view camera on the refurbished Samuel Oschin 48 inch Schmidt telescope (P48) at Palomar Observatory. We used the IPAC forced-photometry pipeline to obtain final P48 photometry and pre-explosion upper limits, reported in Table 1. See Section 2.1.

We obtained ugriz imaging using the Infrared/Optical Imager (IO:O) on the 2m robotic Liverpool Telescope (LT) starting from the first night following the discovery and continuing until the object faded below detection (55 days later). We obtained additional ugri photometry using the Rainbow Camera of the Spectral Energy Distribution Machine (SEDM) on the robotic Palomar 60-inch telescope (P60). We observed the field of SN 2021csp with the Ultraviolet/Optical Telescope (UVOT) on board the Neil Gehrels Swift Observatory beginning 2021 February 12 and continuing until the flux from the transient faded below detectability a month later. An additional set of observations between 2021 March 31 and 2021 April 21 were acquired to constrain the host-galaxy flux. We obtained five epochs of imaging with the Alhambra Faint Object Spectrograph and Camera (ALFOSC) on the 2.56m Nordic Optical Telescope (NOT). Observations were obtained on 2021 April 03, 2021 April 18, 2021 April 20, 2021 May 7, and 2021 July 1. See Section 2.2.

We obtained an extensive series of optical spectra beginning prior to the peak of the SN and extending until 80 days post-explosion in the rest frame. A log of all spectroscopic observations, 25 epochs in total, is provided in Table 2. See Section 3.

(3 data files).