{
  "bibcode": "2007GCN..7101....1W",
  "body": "K. Wiersema, N. Tanvir (Leicester), A. Levan (Warwick), D. Malesani (DARK, \nNBI), P. Jakobsson (Hertfordshire), E. Rol and R. Starling (Leicester) \nreport on behalf of a larger collaboration:\n\nWe observed the BAT position of the short GRB 071112B (GCN 7071) using \nFORS2 on the VLT. We acquired two epochs of data, the first in VRI, the \nsecond in R band only. The first R band epoch, consisting of 5 x 4 minutes \nexposures, started at 00:25:02 UT on 13 november. The second epoch, again \n5 x 4 minutes exposures, started at 00:47:00 UT on 14 november. Both \nepochs were taken in good seeing conditions (0.7 and 0.9 arcsec \nrespectively) but at high airmass. Limiting magnitudes (3 sigma) are \nestimated at R = 25.2 and R = 25.5 for the first and second epochs, \nrespectively. \n\nBoth visual inspection and PSF-matched image subtraction using the ISIS2 \ncode (Alard 2000) did not reveal a significantly fading source in or near \nthe BAT error circle.\n\nWe note that the limiting magnitudes above may not be fully representative \nfor the upper limit on the afterglow brightness, as the BAT error circle \ncontains some nebulosity, and the dithering pattern employed to avoid the \nchip-gap between the two FORS2 chips means that a narrow strip through the \nerror circle has received comparatively less illumination.\n\nWe thank the Paranal staff for their excellent support, particularly \nStephane Brillant and Linda Schmidtobreick.",
  "circularId": 7101,
  "createdOn": 1195324563000,
  "email": "rlcs1@star.le.ac.uk",
  "subject": "VLT FORS2 observations of short hard GRB071112B",
  "submitter": "Rhaana Starling at U of Leicester  <rlcs1@star.le.ac.uk>",
  "eventId": "GRB 071112B"
}