{
  "bibcode": "1998GCN...185....1S",
  "body": "Bradley E. Schaefer (Yale U.), Jonathan Kemp, Irina Feygina, Jules Halpern\n(Columbia U.) report:\n\n\"We have obtained B, V, and R images with the 0.9-m and 1.0-m telescopes\non Cerro Tololo of the GRB981226 position on the nights of 26/27, 27/28,\nand 30/31 December 1998.  We find no variable sources, and no significant\nchanges from the Digitized Sky Survey.  This includes the entire BeppoSAX\nWFC error circle (Di Ciolo et al. IAUCirc. 7074) as well as the BeppoSAX\nNFI error circle (Frontera et al. IAUCirc. 7078).  \n\nA journal of our observations, the corresponding magnitudes, and limits\nare presented in the table below.  Our limiting magnitudes are quoted for\na signal-to-noise ratio of 4.  For the three variables that have been\nproposed previously, we find as follows: \n\n(1) No source is visible at the position of the proposed infrared variable \n    (Castro-Tirado et al. GCN 173) to the limits stated below.  This\n    implies R-J > 1.7 for this source if it is the afterglow.\n\n(2) There is no significant evidence for variability of the proposed\n    candidate of Galama et al. (GCN 172).\n\n(3) The source identified by Wozniak et al. (GCN 177) is clearly visible,\n    but we have no significant evidence of its variability.\"\n\n    -------------------------------------------------------------------\n    Telescope    UT start    Band   Limit    Mag(Galama)   Mag(Wozniak)\n    -------------------------------------------------------------------\n    CTIO 1.0m   Dec 27.044    R     21.6     20.74+-0.13   21.20+-0.20\n    CTIO 0.9m   Dec 27.064    V     21.8    >21.8         >21.8\n    CTIO 0.9m   Dec 27.071    B     21.5    >21.5         >21.5\n    CTIO 1.0m   Dec 28.034    R     21.7     21.06+-0.15   21.15+-0.24\n    CTIO 0.9m   Dec 28.065    V     21.7    >21.7         >21.7\n    CTIO 0.9m   Dec 28.072    R     21.0     20.8 +-0.3    21.03+-0.24\n    CTIO 0.9m   Dec 31.052    R     22.1     21.10+-0.10   21.61+-0.20\n    ------------------------------------------------------------------",
  "circularId": 185,
  "createdOn": 915104258000,
  "email": "brad@grb2.physics.yale.edu",
  "subject": "GRB981226 Optical Observations",
  "submitter": "Brad Schaefer at Yale  <brad@grb2.physics.yale.edu>",
  "eventId": "GRB 981226"
}