{
  "bibcode": "2013GCN.14289....1C",
  "body": "A. Cucchiara (UCSC/UCO Lick Observatory), S. B. Cenko \n(UC Berkeley), D. Perley (Caltech) report on behalf of \na large collaboration:\n\n\"On March 12.4 UT we observed the field of the short-hard \nGRB 130313A (GCN 14282, 14283, 14284, 14285 and 14288) \nwith the Gemini-South telescope equipped with the GMOS camera.\n\nWe obtained 5x180s exposures, for a total integration time\nof 15 minutes (T_mid = T0+1.22 days). \n\n\nA snapshot of our imaging campaign can be seen here:\nhttps://www.dropbox.com/s/jqt714c44b7ngei/0310A_rband.jpeg\nWe note the presence of two irregular objects (marked as \"G1\" adn \"G2\") \nwithin the current XRT error circle (3.6 arcsec radius, GCN 14288).\n\nThe coordinates of this objects are:\n\n\"G1\"\nRA: 09:27:36.34  (J2000)\nDec: -17:06:18.92 (J2000)\n\n\"G2\"\nRA: 09:27:36.46  (J2000)\nDec: -17:06:13.80 (J2000)\n\n\nUsing 3 USNO-B1 stars we estimate a preliminary \nbrightness for \"G1\" of r' = 25.05 +- 0.15 and for\n\"G2\" r'=23.80 +- 0.10.\n\nAt this point the nature of these objects as well as the relation with \nGRB 130313A afterglow is still uncertain. Further observations\nare encouraged.\n\nWe thank the Gemini staff for performing this observations,\nin particular J. Thomas-Osip\"",
  "circularId": 14289,
  "createdOn": 1363075205000,
  "email": "acucchia@ucolick.org",
  "subject": "GRB 130310A: optical observations",
  "submitter": "Antonino Cucchiara at UCSC/UCO Lick  <acucchia@ucolick.org>",
  "eventId": "GRB 130310A"
}