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2. The multiwavelength afterglow of GRB 050721:
a puzzling rebrightening seen in the optical but
not in the X-ray
3. Berger, E., Mulchaey, J., Morrell, N. & Krzeminski, W. 2005, GCN Circ. 3283, http://gcn.gsfc.nasa.gov/gcn/gcn3/3283.gcn3
4. The Unusual Optical Afterglow of the Gamma-Ray Burst GRB 021004: Color Changes and Short-Timescale Variability
5. Bikmaev, I., etal 2005, GCN Circ. 3831, http://gcn.gsfc.nasa.gov/gcn/gcn3/3831.gcn3