{
  "bibcode": "2001GCN...955....1R",
  "body": "E. Rol, I. Salamanca, L. Kaper, P. Vreeswijk (University of\nAmsterdam), P. Lacerda (Leiden Observatory), S. Hodgkin, P.\nTzanavaris (University of Cambridge), N. Tanvir (University of\nHertfordshire), report on behalf of a larger collaboration:\n\n\"We have observed the BeppoSAX error box of GRB010214 (Gandolfi, GCN\n#932) with the 4.2m William Herschel Telescope (+ Prime Focus) and\nwith the 2.2m Isaac Newton Telescope (+ WFC) at La Palma, as follows:\n\n\n  Telescope     Date          Filter  Exp.time  Seeing   Lim. mag.\n\t\t(UT)\t\t       (secs)    (\")     (3 sigma)  \n  =================================================================\n  WHT (+PF)   2001 Feb 15.26    R      2 x 225   0.84     ~23.5\n  INT (+WFC)  2001 Feb 17.25    R      2 x 900   1.2\t  ~24.2\n\n(Note that in our calibration, the USNO star mentioned by Masetti et\nal. (GCN #945) has a magnitude of R=18.4 instead of R=18.3.)\n\nWithin the refined NFI error box (Frontera et al., GCN #950), we\ndetect one object which faded from R = 22.9 to R = 24.1 (1 sigma error\nabout 0.2 mag) between the two observations. \nThe source seems to be extended, likely to be due to an underlying\ngalaxy. We consider this object to be a strong candidate for the optical\nafterglow of GRB010214. The candidate is located at RA = 17:41:02.9\nand Dec = 48:34:30 (J2000; error about 1 arcsec).\n\nAnother variable source is located just outside the refined NFI error\nbox, though within the initial NFI error box (Gandolfi, GCN #937),\nwith a position of RA = 17:41:04.6, Dec = 48:33:47 (J2000). This\nsource has faded from R = 23.1 to 24.0 (error of ~0.2 mag).  The\ninfrared object mentioned by Di Paola et al. (GCN #939; see also\nAntonelli, GCN #944) is clearly visible in our images (R~22.6 in the\nWHT image). We measure two slightly different magnitudes (difference\nof about 0.3), which might indicate a variable star.\n\nImages and more information can be found on\nhttp://www.astro.uva.nl/~evert/grb010214/\n\n\nThis message can be cited.\"",
  "circularId": 955,
  "createdOn": 982777283000,
  "email": "evert@astro.uva.nl",
  "subject": "GRB010214, candidate optical afterglow",
  "submitter": "Evert Rol at U.Amsterdam  <evert@astro.uva.nl>",
  "eventId": "GRB 010214"
}