Abstract
Using deep and high-cadence gamma-ray burst (GRB) afterglow data from the Reionization And Transients Infra-Red/Optical camera, we observe a sharp and achromatic light curve break 12.6 days after the GRB, accompanied by an approximately achromatic bump. Fitting of the optical, near-infrared, and X-ray data suggest a very narrow (2°) jet that remains collimated at late time. We argue that the sharp light curve bump suggests an edge-brightened jet, perhaps emitting only during a brief period of lateral jet expansion. The light curve also exhibits a gradual spectral evolution lasting >10 days. The evolution of the flux can be modeled as , with a temporal slope α = -0.956 0.003 and a gradually time-varying spectral slope .
| Original language | English (US) |
|---|---|
| Article number | L6 |
| Journal | Astrophysical Journal Letters |
| Volume | 873 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1 2019 |
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Keywords
- gamma-ray burst: general
- gamma-ray burst: individual (GRB 160625B)
- stars: jets
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
Cite this
Evidence for a Bright-edged Jet in the Optical/Near-infrared Afterglow of GRB 160625B. / Strausbaugh, Robert; Butler, Nathaniel; Lee, William H.; Troja, Eleonora; Watson, Alan M.
In: Astrophysical Journal Letters, Vol. 873, No. 1, L6, 01.01.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evidence for a Bright-edged Jet in the Optical/Near-infrared Afterglow of GRB 160625B
AU - Strausbaugh, Robert
AU - Butler, Nathaniel
AU - Lee, William H.
AU - Troja, Eleonora
AU - Watson, Alan M.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Using deep and high-cadence gamma-ray burst (GRB) afterglow data from the Reionization And Transients Infra-Red/Optical camera, we observe a sharp and achromatic light curve break 12.6 days after the GRB, accompanied by an approximately achromatic bump. Fitting of the optical, near-infrared, and X-ray data suggest a very narrow (2°) jet that remains collimated at late time. We argue that the sharp light curve bump suggests an edge-brightened jet, perhaps emitting only during a brief period of lateral jet expansion. The light curve also exhibits a gradual spectral evolution lasting >10 days. The evolution of the flux can be modeled as , with a temporal slope α = -0.956 0.003 and a gradually time-varying spectral slope .
AB - Using deep and high-cadence gamma-ray burst (GRB) afterglow data from the Reionization And Transients Infra-Red/Optical camera, we observe a sharp and achromatic light curve break 12.6 days after the GRB, accompanied by an approximately achromatic bump. Fitting of the optical, near-infrared, and X-ray data suggest a very narrow (2°) jet that remains collimated at late time. We argue that the sharp light curve bump suggests an edge-brightened jet, perhaps emitting only during a brief period of lateral jet expansion. The light curve also exhibits a gradual spectral evolution lasting >10 days. The evolution of the flux can be modeled as , with a temporal slope α = -0.956 0.003 and a gradually time-varying spectral slope .
KW - gamma-ray burst: general
KW - gamma-ray burst: individual (GRB 160625B)
KW - stars: jets
UR - http://www.scopus.com/inward/record.url?scp=85063479208&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85063479208&partnerID=8YFLogxK
U2 - 10.3847/2041-8213/ab07c0
DO - 10.3847/2041-8213/ab07c0
M3 - Article
VL - 873
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 1
M1 - L6
ER -