dc.contributor.author | Fong, W | |
dc.contributor.author | Berger, Edo | |
dc.contributor.author | Margutti, R | |
dc.contributor.author | Zauderer, B | |
dc.contributor.author | Troja, E. | |
dc.contributor.author | Czekala, Ian Philip | |
dc.contributor.author | Chornock, R | |
dc.contributor.author | Gehrels, N. | |
dc.contributor.author | Sakamoto, T. | |
dc.contributor.author | Fox, D. B. | |
dc.contributor.author | Podsiadlowski, P. | |
dc.date.accessioned | 2017-02-22T21:13:04Z | |
dc.date.issued | 2012 | |
dc.identifier.citation | Fong, W., E. Berger, R. Margutti, B. A. Zauderer, E. Troja, I. Czekala, R. Chornock, et al. 2012. A Jet Break in the X-Ray Light Curve of Short Grb 111020a: Implications for Energetics and Rates. The Astrophysical Journal 756, no. 2: 189. doi:10.1088/0004-637x/756/2/189. | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://nrs.harvard.edu/urn-3:HUL.InstRepos:30410846 | |
dc.description.abstract | We present broad-band observations of the afterglow and environment of the short GRB 111020A. An extensive X-ray light curve from Swift/XRT, XMM-Newton and Chandra, spanning ∼ 100 seconds to 10 days after the burst, reveals a significant break at δt ≈2 days with pre- and post-break decline rates of αX,1 ≈ −0.78 and αX,2 . −1.7, respectively. Interpreted as a jet break, we infer a collimated outflow with an opening angle of θj ≈ 3 − 8◦. The resulting beaming-corrected γ-ray (10 − 1000 keV band) and blastwave kinetic energies are (2−3)×1048 erg and (0.3−2)×1049 erg, respectively, with the range depending on the unknown redshift of the burst. We report a radio afterglow limit of <39 µJy (3σ) from EVLA observations which, along with our finding that νc < νX , constrains the circumburst density to n0 ∼ 0.01 − 0.1 cm−3. Optical observations provide an afterglow limit of i & 24.4 mag at 18 hours after the burst, and reveal a potential host galaxy with i ≈ 24.3 mag. The sub-arcsecond localization from Chandra provides a precise offset of 0.80′′ ±0.11′′ (1σ) from this galaxy corresponding to an offset of 5−7 kpc for z = 0.5−1.5. We find a high excess neutral Hydrogen column density of (7.5 ± 2.0) × 1021 cm−2 (z = 0). Our observations demonstrate that a growing fraction of short GRBs are collimated which may lead to a true event rate of & 100 − 1000 Gpc−3 yr−1, in good agreement with the NS-NS merger rate of ≈ 200 − 3000 Gpc−3 yr−1. This consistency is promising for coincident short GRB-gravitational wave searches in the forthcoming era of Advanced LIGO/VIRGO. | en_US |
dc.description.sponsorship | Astronomy | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | IOP Publishing | en_US |
dc.relation.isversionof | doi:10.1088/0004-637x/756/2/189 | en_US |
dc.relation.hasversion | https://arxiv.org/pdf/1204.5475.pdf | en_US |
dash.license | OAP | |
dc.title | A Jet Break in the X-Ray Light Curve of Short Grb 111020a: Implications for Energetics and Rates | en_US |
dc.type | Journal Article | en_US |
dc.description.version | Accepted Manuscript | en_US |
dc.relation.journal | The Astrophysical Journal | en_US |
dash.depositing.author | Berger, Edo | |
dc.date.available | 2017-02-22T21:13:04Z | |
dc.identifier.doi | 10.1088/0004-637x/756/2/189 | * |
dash.authorsordered | false | |
dash.contributor.affiliated | Zauderer, B | |
dash.contributor.affiliated | Czekala, Ian | |
dash.contributor.affiliated | Fong, W | |
dash.contributor.affiliated | Chornock, R | |
dash.contributor.affiliated | Margutti, Raffaella | |
dash.contributor.affiliated | Berger, Edo | |