We present the first Swift Ultra-Violet/Optical Telescope ( UVOT ) gamma-ray burst ( GRB ) afterglow catalog .
The catalog contains data from over 64 , 000 independent UVOT image observations of 229 GRBs first detected by Swift , the High Energy Transient Explorer 2 ( HETE2 ) , the INTErnational Gamma-Ray Astrophysics Laboratory ( INTEGRAL ) , and the Interplanetary Network ( IPN ) .
The catalog covers GRBs occurring during the period from 2005 Jan 17 to 2007 Jun 16 and includes \sim 86 \% of the bursts detected by the Swift Burst Alert Telescope ( BAT ) .
The catalog provides detailed burst positional , temporal , and photometric information extracted from each of the UVOT images .
Positions for bursts detected at the 3 \sigma -level are provided with a nominal accuracy , relative to the USNO-B1 catalog , of \sim 0 \farcs 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 detected below 3 \sigma .
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 3 \sigma -level , can be fit by a single power-law , with a median temporal slope ( \alpha ) of 0.96 , beginning several hundred seconds after the burst trigger and ending at \sim 1 \times 10 ^ { 5 } { ~ { } s } .
The median UVOT v -band ( \sim 5500 { ~ { } \AA } ) magnitude at 2000 { ~ { } s } for a sample of “ well ” detected bursts is 18.02 .
The UVOT flux interpolated to 2000 { ~ { } s } after the burst , shows relatively strong correlations with both the prompt Swift BAT fluence , and the Swift X-ray flux at 11 { ~ { } hours } after the trigger .