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We present our optical photometric and spectroscopical observations of GRB140629A. A redshift of $z=2.275\pm0.043$ is measured through the metalabsorption lines in our spectroscopic data. Using our photometric data andmultiple observational data observed with other telescopes, we show that itsoptical light curve is well interpreted with the standard forward shock modelsin the thin shell case. Its optical-X-ray afterglow spectrum is jointly fittedwith a single power-law function, yielding a photon index of $-1.90\pm 0.05$.The optical extinction and neutral hydrogen absorption of the GRB host galaxyare negligible. The fit to the light curve with the standard models shows thatthe ambient density is $60\pm 9$ cm$^{-3}$ and the GRB radiating efficiency isas low as $\sim 0.24\%$, likely indicating a baryonic-dominated ejecta of thisGRB. This burst agrees well with the $L_{\rm p, iso}-E_p^{'}-\Gamma_0$relation, but confidently violates those empirical relations involvinggeometric corrections (or jet break time). This gives rise to an issue ofpossible selection effect on these relations since the jet opening angle ofthis GRB is extremely narrow (0.04 rad).

Photometric and Spectroscopic Observations of GRB 140629A