{
  "bibcode": "2001GCN...954....1M",
  "body": "N. Masetti, E. Palazzi (ITeSRE, CNR, Bologna), E. Pian (Oss. Astron. Trieste),\nS. Desidera, E. Giro, A. Frigo (Oss. Astron. Asiago), R. Falomo (Oss.\nAstron. Padova), A. Zacchei, A. Magazzu, F. Ghinassi, and M. Pedani (TNG), \non behalf of a larger collaboration, report:\n\n\n\"We acquired optical R-band images of the BeppoSAX NFI error box \n(Frontera et al., GCN #950) of GRB010214 (Guidorzi et al., GCN #951)\nwith the 1.8m \"Copernicus\" telescope (+AFOSC) located at Cima Ekar in\nAsiago (Italy). We also observed this field in B, V and R at the\nCanary Islands with TNG+Dolores.\nTotal exposure times, limiting magnitudes and seeing for each of these\nobservations are reported in the table below.\n\n\n  telescope      date       band   exptime   3-sigma    seeing\n                 (UT)               (min)     limit      (\")\n --------------------------------------------------------------\n   Asiago   2001 Feb 16.19    R      30      ~22.5       2.0\n   TNG       \"    \"  16.23    R      10      ~23.5       1.2\n   TNG       \"    \"  16.24    V      10      ~24         1.2\n   TNG       \"    \"  16.25    B      15      ~24         1.2\n   Asiago    \"    \"  21.11    R      35      ~21.5       4.0\n\n\nPhotometric calibration was performed using the USNO-A2.0 catalog star\nU1350_09300715, which has magnitudes R = 18.3 and B = 19.3 and coordinates\n(J2000) RA = 17 40 53.13; Dec = +48 34 08.8. Using those magnitudes and\nassuming a starlike blackbody spectrum for this object, we estimated\nits V magnitude to be 18.7.\nWe could not tie our photometry to the USNO star used by Zhu & Xue \n(GCN #938) because it was saturated in all of our images.\n\nThe comparison between the two Asiago images does not reveal any object\nwith significant brightness variation down to a 3-sigma limiting\nmagnitude R ~ 21.5 inside the NFI error box.\n\nThe IR object reported by Di Paola et al. (GCN #939) is detected in TNG V\nand R images at magnitudes V = 23.8 +- 0.3 and R = 22.02 +- 0.05\n(excluding zero-point calibration uncertainties), while it is\nnot detected in the B band down to the frame limit (B > 24).\nThe object is also detected in the first Asiago image at an R magnitude\nconsistent with that measured at TNG.\nThis very red object is not present on the DSS-II as its R magnitude\nis below the limit of this survey.\nBased on our data we cannot confirm that it does not vary. But, given its\nconstancy in the J band reported by Antonelli et al. (GCN #945), and the\nfact that it lies ~2.4 arcmin from the NFI error box, we can confidently\nsay that this object is unlikely the counterpart of GRB010214. \n\nAlso, we do not detect any object down to the frame limits in all images\nat the position reported by Zhu & Xue (GCN #938).\".\n\n\nThis message can be cited.",
  "circularId": 954,
  "createdOn": 982767867000,
  "email": "masetti@tesre.bo.cnr.it",
  "subject": "GRB010214, optical observations",
  "submitter": "Nicola Masetti at ITeSRE,CNR,Bologna  <masetti@tesre.bo.cnr.it>",
  "eventId": "GRB 010214"
}