We present the firstSwiftUltraviolet/Optical Telescope (UVOT) gamma-ray burst (GRB) afterglow catalog. Thecatalog contains data from over 64,000 independent UVOT image observations of 229 GRBs first detected bySwift,theHigh Energy Transient Explorer 2(HETE2), theInternational Gamma-Ray Astrophysics Laboratory(INTEGRAL), and the Interplanetary Network (IPN). The catalog covers GRBs occurring during the periodfrom 2005 January 17 to 2007 June 16 and includes∼86% of the bursts detected by theSwiftBurst AlertTelescope (BAT). The catalog provides detailed burst positional, temporal, and photometric information extractedfrom each of the UVOT images. Positions for bursts detected at the 3σlevel are provided with a nominalaccuracy, relative to the USNO-B1 catalog, of∼0.′′25. Photometry for each burst is given in three UV bands,three optical bands, and a “white” or open filter. Upper limits for magnitudes are reported for sources detectedbelow 3σ. General properties of the burst sample and light curves, including the filter-dependent temporal slopes,are also provided. The majority of the UVOT light curves, for bursts detected at the 3σlevel, can be fit bya single power-law, with a median temporal slope (α) of 0.96, beginning several hundred seconds after theburst trigger and ending at∼1×105s. The median UVOTv-band (∼5500 Å) magnitude at 2000 s for asample of “well”-detected bursts is 18.02. The UVOT flux interpolated to 2000 s after the burst, shows relativelystrong correlations with both the promptSwiftBAT fluence, and theSwiftX-ray flux at 11 hr after the trigger.
- catalogs, gamma rays: bursts, Astrophysics