학술논문
A search for the afterglows, kilonovae, and host galaxies of two short GRBs: GRB 211106A and GRB 211227A
Document Type
Working Paper
Author
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)
Subject
Language
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.
Comment: Accepted to A&A on 08 August 2023, 21 pages, 24 figures
Comment: Accepted to A&A on 08 August 2023, 21 pages, 24 figures