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IceCube-210922A: DESI Observations

Abstract:

We observed the location of IceCube 210922A (GCN 30862) using the Dark Energy Spectroscopic Instrument (DESI), a multi-object spectrograph with 5000 fibers installed on the Mayall 4m telescope at Kitt Peak National Observatory. On the night of September 23 2021, we recorded spectra of 249 galaxies in the 90% CL of the IceCube event, which represent~ 20% of all DESI Bright Galaxy Sample (BGS) galaxies in the region, a sample of galaxies complete down to r-band apparent magnitude of 19.5. Each fiber covers a circular region of 1.5" in diameter centered on the core of the galaxy. Observations started at 02: 48 MST and lasted a total of 2200s. We searched for core-collapse SNe using a Convolutional Neural Network algorithm (DESITRIP-DESI Transients Identification Pipeline) optimized to identify transients on top of galaxy emission in DESI spectra. We also searched for Tidal Disruption Events based …