We have obtained spectra of the likely host galaxy (Miller et al., GCN 10377) and afterglow (Levan et al., GCN 10386) of the short-hard GRB 100206A (Krimm et al, GCN 10376) with the Low Resolution Imaging Spectrometer mounted on the 10-m Keck I telescope. Observations began at 06:17 UT on 7 February (~ 16.8 hours after the burst) and cover the wavelength range from approximately 3500 - 10000...Full Text

We have obtained pre-explosion images of the field of GRB 100117A from the Canada-France-Hawaii MegaCam archive. Images were obtained in the g', r', and z' filters on 26 December 2005, and in the i' filter on 12 November 2007. Exposure times ranged from 240 s in g'-band to 500 s in i'-band. Inside the candidate XRT afterglow localization (de Pasquale; GCN 10336), we find four sources, with the...Full Text

We have imaged the field of GRB 091117 (Cummings et al., GCN 10171) with the Gemini Multi-Object Spectrograph on the 8 m Gemini South telescope beginning at 7:07 UT on 19 November (~ 37 hours after the burst trigger time). Observations were conducted in the Sloan g', r', and i' filters under poor seeing conditions (~ 2" FWHM). We find no new point sources at the location of either candidate X-ray afterglow...Full Text

We obtained optical spectra of the afterglow of GRB 091029 (Grupe et al., GCN 10097; Filgas et al., GCN 10098; LaCluyze et al., GCN 10099) using GMOS on Gemini-South. Our spectra cover the wavelength range of 3900-8100 angstroms with the R400 grating. Our first 600s exposure, starting at 06:06 UT on Oct. 29 (2.2 hr after the BAT trigger) reveals absorption lines from Lyman-alpha, C II, C IV...Full Text

We have imaged the field of the Fermi GRB 090926A (Bissaldi et al., GCN 9933; Uehara et al., GCN 9934) with the Gemini Multi-Object Spectrograph mounted on the 8-m Gemini South telescope. Observations were taken in the Sloan g', r', and i' filters beginning at 2:28 UT on 19 October 2009 (~ 22.9 d after the GBM trigger). We detect a faint source in all filters at the location of the optical afterglow...Full Text

We have imaged the field of GRB 090709A (Morris et al., GCN 9625) with the automated Palomar 60-inch telescope. Observations began at 7:40:26 UT on 9 July 2009 (~ 2 minutes after the burst trigger) and were taken in the r', i', and z' filters. We marginally detect a faint source at the location of the NIR afterglow (Aoki et al., GCN 9634, Morgan et al., GCN 9635) in our first r' and z' images...Full Text

We have obtained a spectrum of the afterglow (GCN 9512, 9513, 9514, 9515) of GRB 090618 with the KAST spectrograph on the 3-m Shane telescope at Lick Observatory. Observations began at 08:48 UT on 18 June 2009, approximately 20 minutes after the burst. On the blue channel (using the 830/3460 grism, providing wavelength coverage from 3200 - 4400 A), we detect a number of strong absorption features...Full Text

We have analyzed the KAIT observations on GRB 090618 (GCN 9512) as reported in GCN 9514. Our first 2s unfiltered observation started at 08:29:44 UT, 75 s after the BAT trigger. The OA as reported in GCN 9512, 9513, 9514, and 9515 is clearly detected. Subsequent observations show that the OA declined and reached a bottom at t=92 s, then brightened and reached a peak at t=120 s. After the peak...Full Text

The Katzman Automatic Imaging Telescope (KAIT) responded to GRB 090618 and began taking data at 08:31:10 (UT). A bright (~14th magnitude) optical afterglow is visible in the initial set of exposures at the following position: RA 19:35:58.80 dec +78:21:25.5 Further follow-up is in progress. ...Full Text

We obtained optical spectra of the afterglow of GRB 090424 (Cannizzo et al., GCN 9223) using GMOS on Gemini-South. Our spectra cover the wavelength range of 4400-8600 angstroms. Our first 1200s exposure, starting at 01:51:56 April 25 UT (11.7 hr after the trigger) reveals.a pair of absorption lines at 6077 and 6130 Angs, which we identify as the Ca II H+K doublet at z=0.544. Additionally, an emission...Full Text

We initiated a series of 15 x 200 second exposures of the field of GRB 090423 (Krimm et al, GCN 9198) in z-band using GMOS on Gemini-South starting at 23:38 UT on 2009-04-23, 15.71 hours after the trigger. No source is visible in the XRT error circle (Evans et al., GCN 9205) or the NIR position (Tanvir et al., GCN 9202) in the co-added image. We estimate a limiting magnitude (3-sigma) of: z...Full Text

We have obtained optical spectra of the candidate UVOT afterglow (GCN 9046, 9048) of the Fermi GRB 090328 (GCN 9044) with the Gemini Multi-Object Spectrograph mounted on the Gemini South Telescope. Observations began at 00:05 UT on 2009 March 29. Our first 1500 second spectrum uses the R400 grating and covers the approximate wavelength range from 4000-8000 A. We find a single bright emission...Full Text

We performed spectroscopy on the afterglow of GRB 090323 (Ohno et al., GCN 9021; Updike et al., GCN 9026; Cenko and Perley, GCN 9027) using Gemini-South (GMOS) starting at 05:58 UT on 2009-03-24, approximately 30 hours after the trigger. We conducted a series of four exposures of 600 seconds, two using the B600 grating centered at 6000 Angstroms and two with the R400 grating centered at 8000 Angstroms...Full Text

We have imaged the field of GRB 090323 (Ohno et al., GCN 9021) with the automated Palomar 60-inch telescope. Observations were taken in the Sloan r' and i' filters beginning at 2009 Mar 24 04:20 UT (~ 28.30 hr after the burst). Inside the XRT error circle (Kennea et al., GCN 9024) we find a single source consistent with the position repored by Updike et al (GCN 9026). At this epoch we measure...Full Text

Following our spectroscopic integration on the optical afterglow of GRB 090313 (GCN 8994), we acquired one 60s frame in each of g, r, i, and z filters using Gemini-S (GMOS) in imaging mode between 05:11 and 05:18 UT (20.07 hours after the burst). We report the following magnitudes: g = 21.62 +/- 0.08 r = 20.12 +/- 0.03 i = 19.50 +/- 0.05 z = 19.03 +/- 0.05 The optical SED is well-fit assuming...Full Text

We continued observing the position of the optical afterglow (Chornock et al., GCN 8979) of GRB 080313 (Mao et al., GCN 8980) with the Katzman Automatic Imaging Telescope (KAIT) in unfiltered and I-band images lasting until 2.9 hours after the trigger. In spite of significant contamination due to scattered light from the full moon 20 degrees away, we continue to (marginally) detect the afterglow...Full Text

We have imaged the field of GRB 090308 (Evans et al.; GCN 8948) with GMOS mounted on the Gemini South telescope beginning at approximately 1:38 UT on the night of 9 MarcHETE 2009 (~ 7.6 hours after the burst). Images were taken in the g', r', i', and z' filters for a total of 300 s in each band. We find no significant sources inside the revised XRT error circle (Evans et al.; GCN 8956) to the...Full Text

We have imaged the field of the short GRB 090305 (Beardmore et al., GCN 8932) with GMOS mounted on the Gemini South telescope beginning approximately 27 minutes after the burst. Observations were taken in the Sloan g', r', and i' filters and cover nearly the entire BAT error circle. Inside the BAT error circle, we find a fading point source at the location (J2000.0): RA: 16:07:07.61 Dec...Full Text

We began a series of deep optical imaging exposures on the field of GRB 081221 (Hoversten et al., GCN 8687) using the Keck I telescope (+LRIS) starting at 2008-12-23 at 5:06 UT. We acquired 10x330s in g-band and 10x300s in I-band (simultaneously using the 560 dichroic)....Full Text

During morning twilight on 2008-12-07 UT (starting at 15:40) we undertook additional imaging of the optical transient associated with GRB 081203B, using GMOS on Gemini-North. We report the following magnitudes: ...Full Text