Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A

R. L. Becerra, S. Dichiara, A. M. Watson, E. Troja, N. Fraija, A. Klotz, Nathaniel Butler, W. H. Lee, P. Veres, D. Turpin, J. S. Bloom, M. Boer, J. J. González, A. S. Kutyrev, J. X. Prochaska, E. Ramirez-Ruiz, M. G. Richer

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We present observations of the possible short GRB 180418A in γ-rays, X-rays, and in the optical. Early optical photometry with the TAROT and RATIR instruments shows a bright peak (≈14.2 AB mag) between T + 28 and T + 90 s that we interpret as the signature of a reverse shock. Later observations can be modeled by a standard forward shock model and show no evidence of a jet break, allowing us to constrain the jet collimation to θ j > 7°. Using deep late-time optical observations, we place an upper limit of r > 24 AB mag on any underlying host galaxy. The detection of the afterglow in the Swift UV filters constrains the GRB redshift to z < 1.3 and places an upper bound on the γ-ray isotropic equivalent energy E γ,iso < 3 ×1051 erg. The properties of this GRB (e.g., duration, hardness ratio, energy, and environment) lie at the intersection between short and long bursts, and we cannot conclusively identify its type. We estimate that the probability that it is drawn from the population of short GRBs is 10%-30%.

Original languageEnglish (US)
Article number12
JournalAstrophysical Journal
Volume881
Issue number1
DOIs
StatePublished - Aug 10 2019

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photometry
shock
rays
erg
hardness
energy
collimation
filter
afterglows
intersections
bursts
signatures
galaxies
filters
estimates
x rays
detection

Keywords

  • gamma-ray burst: individual (GRB 180418A)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Becerra, R. L., Dichiara, S., Watson, A. M., Troja, E., Fraija, N., Klotz, A., ... Richer, M. G. (2019). Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A. Astrophysical Journal, 881(1), [12]. https://doi.org/10.3847/1538-4357/ab275b

Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A. / Becerra, R. L.; Dichiara, S.; Watson, A. M.; Troja, E.; Fraija, N.; Klotz, A.; Butler, Nathaniel; Lee, W. H.; Veres, P.; Turpin, D.; Bloom, J. S.; Boer, M.; González, J. J.; Kutyrev, A. S.; Prochaska, J. X.; Ramirez-Ruiz, E.; Richer, M. G.

In: Astrophysical Journal, Vol. 881, No. 1, 12, 10.08.2019.

Research output: Contribution to journalArticle

Becerra, RL, Dichiara, S, Watson, AM, Troja, E, Fraija, N, Klotz, A, Butler, N, Lee, WH, Veres, P, Turpin, D, Bloom, JS, Boer, M, González, JJ, Kutyrev, AS, Prochaska, JX, Ramirez-Ruiz, E & Richer, MG 2019, 'Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A', Astrophysical Journal, vol. 881, no. 1, 12. https://doi.org/10.3847/1538-4357/ab275b
Becerra, R. L. ; Dichiara, S. ; Watson, A. M. ; Troja, E. ; Fraija, N. ; Klotz, A. ; Butler, Nathaniel ; Lee, W. H. ; Veres, P. ; Turpin, D. ; Bloom, J. S. ; Boer, M. ; González, J. J. ; Kutyrev, A. S. ; Prochaska, J. X. ; Ramirez-Ruiz, E. ; Richer, M. G. / Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A. In: Astrophysical Journal. 2019 ; Vol. 881, No. 1.
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AU - Fraija, N.

AU - Klotz, A.

AU - Butler, Nathaniel

AU - Lee, W. H.

AU - Veres, P.

AU - Turpin, D.

AU - Bloom, J. S.

AU - Boer, M.

AU - González, J. J.

AU - Kutyrev, A. S.

AU - Prochaska, J. X.

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