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A search for the afterglows, kilonovae, and host galaxies of two short GRBs: GRB 211106A and GRB 211227A

Authors :
Ferro, M.
Brivio, R.
D'Avanzo, P.
Rossi, A.
Izzo, L.
Campana, S.
Christensen, L.
Dinatolo, M.
Hussein, S.
Levan, A. J.
Melandri, A.
Bernardini, M. G.
Covino, S.
D'Elia, V.
Della Valle, M.
De Pasquale, M.
Gompertz, B. P.
Hartmann, D.
Heintz, K. E.
Jakobsson, P.
Kouveliotou, C.
Malesani, D. B.
Martin-Carrillo, A.
Nava, L.
Guelbenzu, A. Nicuesa
Pugliese, G.
Salvaggio, C.
Salvaterra, R.
Savaglio, S.
Sbarrato, T.
Tanvir, N. R.
Wijers, R. A. M. J.
Zafar, T.
Source :
A&A 678, A142 (2023)
Publication Year :
2023

Abstract

Context: GRB 211106A and GRB 211227A are recent gamma-ray bursts (GRBs) with initial X-ray positions suggesting associations with nearby galaxies (z < 0.7). Their prompt emission characteristics indicate GRB 211106A is a short-duration GRB and GRB 211227A is a short GRB with extended emission, likely originating from compact binary mergers. However, classifying solely based on prompt emission can be misleading. Aims: These short GRBs in the local Universe offer opportunities to search for associated kilonova (KN) emission and study host galaxy properties in detail. Methods: We conducted deep optical and NIR follow-up using ESO-VLT FORS2, HAWK-I, and MUSE for GRB 211106A, and ESO-VLT FORS2 and X-Shooter for GRB 211227A, starting shortly after the X-ray afterglow detection. We performed photometric analysis to look for afterglow and KN emissions associated with the bursts, along with host galaxy imaging and spectroscopy. Optical/NIR results were compared with Swift X-Ray Telescope (XRT) and other high-energy data. Results: For both GRBs we placed deep limits to the optical/NIR afterglow and KN emission. Host galaxies were identified: GRB 211106A at photometric z = 0.64 and GRB 211227A at spectroscopic z = 0.228. Host galaxy properties aligned with typical short GRB hosts. We also compared the properties of the bursts with the S-BAT4 sample to further examined the nature of these events. Conclusions: Study of prompt and afterglow phases, along with host galaxy analysis, confirms GRB 211106A as a short GRB and GRB 211227A as a short GRB with extended emission. The absence of optical/NIR counterparts is likely due to local extinction for GRB 211106A and a faint kilonova for GRB 211227A.<br />Comment: Accepted to A&A on 08 August 2023, 21 pages, 24 figures

Details

Database :
arXiv
Journal :
A&A 678, A142 (2023)
Publication Type :
Report
Accession number :
edsarx.2309.03000
Document Type :
Working Paper
Full Text :
https://doi.org/10.1051/0004-6361/202347113