Late Central Engine Activity in GRB 180205A. (arXiv:1901.06051v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Becerra_R/0/1/0/all/0/1">R. L. Becerra</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Watson_A/0/1/0/all/0/1">A. M. Watson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fraija_N/0/1/0/all/0/1">N. Fraija</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Butler_N/0/1/0/all/0/1">N. R. Butler</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lee_W/0/1/0/all/0/1">W. H. Lee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Troja_E/0/1/0/all/0/1">E. Troja</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Roman_Zuniga_C/0/1/0/all/0/1">C. G. Rom&#xe1;n-Z&#xfa;&#xf1;iga</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kutyrev_A/0/1/0/all/0/1">A. S. Kutyrev</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nunez_L/0/1/0/all/0/1">L. C. &#xc1;lvarez Nu&#xf1;ez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Angeles_F/0/1/0/all/0/1">F. &#xc1;ngeles</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chapa_O/0/1/0/all/0/1">O. Chapa</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cuevas_S/0/1/0/all/0/1">S. Cuevas</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Farah_A/0/1/0/all/0/1">A. S. Farah</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fuentes_Fernandez_J/0/1/0/all/0/1">J. Fuentes-Fern&#xe1;ndez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Figueroa_L/0/1/0/all/0/1">L. Figueroa</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Langarica_R/0/1/0/all/0/1">R. Langarica</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Quiros_F/0/1/0/all/0/1">F. Quir&#xf3;s</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ruiz_Diaz_Soto_J/0/1/0/all/0/1">J. Ru&#xed;z-D&#xed;az-Soto</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tinoco_C/0/1/0/all/0/1">C. G. Tejada S. J. Tinoco</a>

We present optical photometry of the afterglow of the long GRB 180205A with
the COATLI telescope from 217 seconds to about 5 days after the {itshape
Swift}/BAT trigger. We analyse this photometry in the conjunction with the
X-ray light curve from {itshape Swift}/XRT. The late-time light curves and
spectra are consistent with the standard forward-shock scenario. However, the
early-time optical and X-ray light curves show non-typical behavior; the
optical light curve exhibits a flat plateau while the X-ray light curve shows a
flare. We explore several scenarios and conclude that the most likely
explanation for the early behavior is late activity of the central engine.

We present optical photometry of the afterglow of the long GRB 180205A with
the COATLI telescope from 217 seconds to about 5 days after the {itshape
Swift}/BAT trigger. We analyse this photometry in the conjunction with the
X-ray light curve from {itshape Swift}/XRT. The late-time light curves and
spectra are consistent with the standard forward-shock scenario. However, the
early-time optical and X-ray light curves show non-typical behavior; the
optical light curve exhibits a flat plateau while the X-ray light curve shows a
flare. We explore several scenarios and conclude that the most likely
explanation for the early behavior is late activity of the central engine.

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