{
  "bibcode": "2015GCN.17313....1F",
  "body": "W. Fong (U. Arizona), R. Chornock (Ohio U.) and D. Fox (PSU) report:\n\n\"We observed the location of the possibly short GRB 150120A (D'Elia et al.,\nGCN 17310) with the Gemini Multi-Object Spectrograph (GMOS) mounted on the\nGemini-North 8-m telescope starting on 2015 Jan 20.206 UT (2.0 hr after the\nBAT trigger). We obtained 1800-sec in each of the riz-bands in 0.5\" seeing.\nWithin the enhanced XRT position (Evans, GCN 17311), we do not detect any\noptical sources in our images. Tied to SDSS, we calculate a 3-sigma limit\nof r>26.3 AB mag.\n\nWe clearly detect two sources on the outskirts of the XRT position (Sources\nA and B from P60 observations; Perley et al., GCN 17312), both of which\nappear extended in our images. We do not find any evidence for variability\nof these sources over the duration of our observations.\n\nWe thank Gemini observers and staff Sabrina Pakzad, Katherine Roth, Joe\nBurchett, and Rongmon Bordoloi for the quick scheduling and execution of\nthese observations.\"",
  "circularId": 17313,
  "createdOn": 1421740261000,
  "email": "wfong@email.arizona.edu",
  "subject": "GRB 150120A: Gemini-North optical imaging",
  "submitter": "Wen-fai Fong at U of Arizona  <wfong@email.arizona.edu>",
  "eventId": "GRB 150120A"
}