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| GRB 050607: Optical follow-up |
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| OT (J2000) 20h00m42s.81, +09°08'35".2 (XRT 8" radius) | |
| GCN Circular #3530: GRB 050607: MDM Observations |
J. P. Halpern (Columbia), J. Kemp (Joint Astronomy Centre and Columbia), and N. Mirabal (U. Michigan), report on behalf of the MDM Observatory GRB follow-up team: We monitored the location of Swift GRB 050607 and its decaying X-ray afterglow (Retter et al., GCN #3525; Pagani et al., GCN #3528) in the R band with the MDM 2.4m telescope beginning 16 minutes after the trigger, and extending to 2 hours. Seeing was approximately 1.1". The afterglow candidate discovered by Rhoads (GCN #3527) is present in all of our images with 22.5 < R < 23, and appears to have faded. However, it is difficult for us to characterize its variability at this stage in the analysis as there may also be extended emission. If correct, this is the faintest optical afterglow detected at the equivalent time (Berger et al., astro-ph/0502468), even taking into account the 0.4 magnitudes of Galactic R-band absorption in this direction. Images are posted at http://www.astro.columbia.edu/~jules/grb/050607/ |
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| GCN Circular #3541: GRB 050607: MDM Observation |
J. P. Halpern (Columbia), J. Kemp (Joint Astronomy Centre and Columbia), and N. Mirabal (U. Michigan), report on behalf of the MDM Observatory GRB follow-up team: We reobserved the afterglow of GRB 050607 in the R band with the MDM 2.4m telescope for 30 minutes starting on June 8 08:15 UT, 23 hr after the burst. Seeing was approximately 1.1", similar to the previous night. An upper limit of R > 24.0 for a point source is found at the position of the afterglow. The possible host galaxy (Rhoads, GCN #3540) would be difficult to quantify in our image due to the nearby bright star. See http://www.astro.columbia.edu/~jules/grb/050607/ |
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Nestor Mirabal mirabal@umich.edu |
Jules Halpern jules@astro.columbia.edu |
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| Last Modified: June 9, 2005 | jules@astro.columbia.edu |