{
  "bibcode": "2011GCN.12346....1P",
  "body": "D. A. Perley (Caltech), A. Cucchiara (UC Santa Cruz), and N. R. Tanvir\n(Leicester) report on behalf of a larger collaboration:\n\nWe imaged the field of GRB 110915A (Holland et al., GCN 12335) with \nGMOS-S on Gemini-South starting at 00:36 UT on 2011-09-16.  We acquired \n6x240 seconds in i-band, and 7x240 seconds in z-band. Conditions were \nclear with generally good seeing (0.7\").\n\nWe find no significant sources within the XRT error circle in either \nfilter.  We calculate the following 3-sigma limits:\n\n   i > 26.0 mag  (t_mid = 11.49 hr)\n   z > 24.9 mag  (t_mid = 12.03 hr)\n\nGiven the bright X-ray afterglow and and other optical limits reported \nto date, these results indicate that GRB 110915A is a very dark burst, \nas also noted by Malesani et al (GCN 12343).  Infrared and radio \nfollow-up is encouraged.",
  "circularId": 12346,
  "createdOn": 1316148032000,
  "email": "dperley@astro.berkeley.edu",
  "subject": "GRB 110915A: Deep Gemini-South i/z-band imaging",
  "submitter": "Daniel Perley at U.C. Berkeley  <dperley@astro.berkeley.edu>",
  "eventId": "GRB 110915A"
}