{
  "bibcode": "1998GCN...170....1F",
  "body": "D. A. Frail (NRAO), and S. R. Kulkarni (Caltech) report on behalf of a\nlarger NRAO/Caltech collaboration:\n\n\"We have observed the error box of GRB 981220 (GCN #159, GCN #160)\nwith the Very Large Array (VLA) for 12 minutes each at 4.86 GHz and\n8.46 GHz on Dec 23.14 UT, 1998. On this day we detected a source at RA\n= 3h42m28.94s +- 0.01s, Dec = +17d09'14.6'' +- 0.2'' with a 4.86 GHz\nflux density of 200 +- 45 microJy and a 8.46 GHz flux density of 370\n+- 43 microJy. This is the same radio source reported by Galama et\nal. (GCN #168). Noting its unusual rising spectrum we carried out\nanother set of observations on Dec 27.21. We observed the field for 18\nminutes at each frequency and measured a 4.86 GHz flux density of 540\n+- 40 microJy and a 8.46 GHz flux density of 460 +- 36 microJy. These\nwide swings of flux and spectral index resemble the behavior of radio\nafterglows at early times. Other sources in the field have remained\nconstant during this time.  We suggest that J034228.94+170914.6 is the\nradio afterglow of GRB 981220. Our position is accurate to 0.2 arcsec\n(1-sigma) and should enable deep optical studies.  Further radio\nobservations are in progress.\"\n\nThis message is citeable.",
  "circularId": 170,
  "createdOn": 914781052000,
  "email": "dfrail@nrao.edu",
  "subject": "GRB 981220, radio observations",
  "submitter": "Dale A. Frail at NRAO  <dfrail@nrao.edu>",
  "eventId": "GRB 981220"
}