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Rapport Année : 2021

ZTF21aaeyldq: GTC Redshift and GRB afterglow nature confirmation

A. de Ugarte Postigo
D. A. Kann
  • Fonction : Auteur
D. A. Perley
  • Fonction : Auteur
C. C. Thoene
  • Fonction : Auteur
M. Blazek
  • Fonction : Auteur
J. F. Agui Fernandez
  • Fonction : Auteur
R. Scarpa
  • Fonction : Auteur

Résumé

We observed the fast-fading hostless transient ZTF21aaeyldq (Ho et al., GCN #29305) with OSIRIS at the 10.4m Gran Telescopio Canarias (Roque de los Muchachos Observatory, La Palma, Canary Islands, Spain), starting at 2021-01-16 23:35:54.359 UT (16.60 hours after the first optical detection). The source is clearly detected. We obtained a 60 s r'-band finder image and 4 x 900 s spectroscopy with the R1000B grism. For the image starting at 2021-01-16 23:27:09.671 (0.68604 days after the first optical detection), we measure r' = 21.64 +/- 0.03 (AB mag) vs. a nearby SDSS star. The spectrum shows a clear continuum over the full spectral range with many strong absorption lines. We identify these lines as Ly-alpha, SII, OI, SiII, SiIV, CII, CIV, FeII, AlII, and AlIII, at a mean redshift of z = 2.514. We identify this as the redshift of the transient. Coupled with the rapid decay, the moderately red color (Ho et al., GCN #29305) and the lack of any broad spectral features, we also identify this transient as a GRB afterglow for which no high-energy trigger has been reported yet.
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Dates et versions

hal-03877992 , version 1 (29-11-2022)

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A. de Ugarte Postigo, D. A. Kann, D. A. Perley, C. C. Thoene, M. Blazek, et al.. ZTF21aaeyldq: GTC Redshift and GRB afterglow nature confirmation. GRB Coordinate Network 29307. 2021. ⟨hal-03877992⟩
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