Gamma-ray burst afterglow with continuous energy injection: Signature of ahighly magnetized millisecond pulsar

We investigate the consequences of a continuously injecting central engine on the gamma-ray burst afterglow emission, focusing more specifically on a highly magnetized millisecond pulsar engine. For initial pulsar parameters within a certain region of the parameter space, the afterglow light curves are predicted to show a distinctive achromatic bump feature, the onset and duration of which range from minutes to months, depending on the pulsar and the fireball parameters. The detection of, or upper limits on, such featur es would provide constraints on the burst progenitor and on magnetar-like c entral engine models. An achromatic bump such as that in the GRB 000301C af terglow may be caused by a millisecond pulsar with P-0 = 3.4 ms and B-p = 2 .7 x 10(14) G.