ROTSE-IIId, located at the Turkish National Observatory at Bakirlitepe, Turkey, responded to GRB 090113 (Swift trigger 339852; H. A. Krimm, GCN 8804), producing images beginning 6.4 s after the GCN notice time. An automated response took the first image at 18:49:02.4 UT, 503.2 s after the burst, under windy conditions. We took 10 5-sec, 10 20-sec and 30 60-sec exposures. These unfiltered...Full Text

ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 080310 (Swift trigger 305288; Cummings et al., GCN 7382) and began imaging at UT 08:38:25.7 (5.7 sec after the GCN notice time) under cloudy conditions. The first usable image with a detection of the OT (Chornock et al. GCN 7381) starts at UT 09:03:03.4. Observations continued in fluctuating weather conditions until about...Full Text

ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 071025 (Swift trigger 295301, GCN 6986, Pagani, et al.) and detected an optical counterpart as reported in GCN 6987 (Rykoff, et al.). We have improved the photometry and recalibrated the images relative to USNO-B1.0 R-band, which is significantly offset from the magnitudes in USNO-A2.0 R-band....Full Text

ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 071025 (Swift trigger 295301, GCN 6986). The first image was at 04:10:14.0 UT, 80.3 s after the burst (6.0 s after the GCN notice time). The unfiltered images are calibrated relative to USNO A2.0. We detect a 19.2 magnitude, fading source with coordinates: ...Full Text

ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 071020 (Swift trigger 294835; Holland, et al., GCN 6949) and detected the optical counterpart (Schaefer, et al., GCN 6948). During our first 80 seconds observation (starting 25.6 sec after the burst), the OT faded with a decay index of 1.52 +/- 0.03....Full Text

ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to GRB 070809 (Swift trigger 287344; Marshall, et al., GCN 6728), producing images beginning 10.2 s after the GCN notice time. An automated response took the first image at 19:22:48.2 UT, 30.9 s after the burst, under excellent conditions. We took 10 5-sec, 10 20-sec and 10 60-sec exposures. These unfiltered images...Full Text

ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to GRB 070621 (Swift trigger 282808, Sbarufatti, et al., GCN 6560), producing images beginning 6.1 s after the GCN notice time. An automated response took the first image at 23:18:03.1 UT, 23.3 s after the burst, and during gamma-ray emission. We took 10 5-sec, 10 20-sec and 10 60-sec exposures. These unfiltered...Full Text

ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to GRB 070411 (Swift trigger 275087, GCN 6267, Moretti, et al.). The first image was at 20:15:25.1 UT, 172 s after the burst; the response was delayed due to a GCN connection problem. We took 10 5s exposures followed by 50+ 20s exposures. The unfiltered images are calibrated relative to USNO B1.0, and no correction...Full Text

ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to GRB 061025 (Integral trigger 3525, Mereghetti, et al, GCN 5751), producing images beginning 4.6 s after the GCN notice time. An automated response took the first image at 18:36:46.6 UT, 44.7 s after the burst, under excellent conditions. We took 10 5-sec, 10 20-sec and 31 60-sec eposures. These unfiltered images...Full Text

ROTSE-IIIa, located at the Siding Spring Observatory, Australia, responded to Swift trigger 221755 (GRB 060729; Grupe et al., GCN 5365) with an automatic sequence of 10 5-second, 10 20-second, and 34 60-second integrations before twilight set in (Quimby et al., GCN 5366). Another 30 60-second images were taken on July 30, and 60 further 60-second frames were recorded on July 31....Full Text

ROTSE-IIIa, located at the Siding Spring Observatory, Australia, responded to Swift trigger 221755 (GRB 060729; Grupe et al. GCN 5365). The first image was taken at 19:13:33.5 UT, 64.3 s after the burst (8.5 s after the GCN notice time). We detect a source coincident with the UVOT position (GCN 5365). In a 5-second image beginning at 19:14:02.1 and coincident with the second, larger peak...Full Text

ROTSE-IIIa, located at Siding Spring Observatory, Australia, found a bright optical transient (Rykoff et al. 2006, GCN 5220) near the center of the Swift BAT position for GRB 060605A (M. J. Page et al. 2006, GCN 5221). The Swift XRT and UVOT later reported a fading counterpart at this same position (Page et al. 2006, GCN 5221). In the first ROTSE image (started 48.7 s after the burst)...Full Text

ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 060501 (Swift trigger 208050, GCN 5040), producing usable images beginning 92 s after the GCN notice time. An automated response took the first image at 08:22:4.6 UT, 426 s after the burst, under fair conditions with high airmass. We took 7 20-s exposures before bad weather forced the system to close. These unfiltered images...Full Text

ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 060312 (Swift trigger 201391; D. Grupe et al. 2005, GCN 4859), producing images beginning 6.0 s after the GCN notice time. An automated response took the first image at 01:36:33.0 UT, 20.3 s after the burst trigger. We took 10 5-sec, 10 20-sec and 74 60-sec eposures; with ongoing imaging. The first 25 images were taken with...Full Text

ROTSE-IIIb, located at the McDonald Observatory, Texas, responded to Swift trigger 191157 (possible GRB 060218A; Cusumano et al. GCN 4775; Barbier et al. GCN 4780). The first image was taken at 03:36:07.9 UT, 97.0 s after the burst (5.9 s after the GCN notice time). We detect a source coincident with the refined UVOT position reported by Marshall et al. (GCN 4779). Intermittent clouds reduced...Full Text

A fast fading optical transient has been discovered inside the error circle for GRB 051111A (Swift trigger 163438, Sakamoto et al, GCN 4248) by the ROTSE-IIIb telescope, located at McDonald Observatory (see Rujopakarn et al, GCN 4247). The initial response was during the BAT emission, when the transient was at 13.0 mag (unfiltered relative to USNO A2.0). The transient faded as a simple...Full Text

We observed the optical afterglow (Rykoff et al. GCN 4211) of GRB 051109 (Tagliaferri et al. GCN 4213) with the 9.2m Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) beginning November 9, 03:55:40 UT (~2.5 hrs after the burst trigger). Several absorption lines are present in the spectrum corresponding to Si II (1526.7), C IV, Cr II (2056.3, 2066.2), and Fe II (2344.2, 2382.8)...Full Text

A fast fading optical transient has been discovered inside the error circle for GRB 051109A (Swift trigger 163136) by the ROTSE-IIIb telescope, located at McDonald Observatory (cf. Rykoff et al. GCN 4211). The source faded as a power law. At the central time of UT 01:16:05 (228 seconds after the Swift trigger), the magnitude was 16.21. (Magnitudes are unfiltered and calibrated against R-band...Full Text

ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 051109 (Swift trigger 163136). The first image was at 01:12:52.7 UT, 32.1 s after the burst (4.7 s after the GCN notice time). The unfiltered images are calibrated relative to USNO A2.0. We detect a new object, not visible in the DSS (second epoch), with coordinates:...Full Text

ROTSE-IIId, located at the Turkish National Observatory at Bakirlitepe, Turkey, responded to GRB 050922C (Swift trigger 156467). (Note that the burst designation in GCN 4011 is incorrect)....Full Text