TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4389 SUBJECT: GRB 051221A: Chandra Afterglow Position DATE: 05/12/23 07:14:20 GMT FROM: Dirk Grupe at PSU/Swift-XRT GRB 051221A: Chandra Afterglow Position D. Grupe (PSU), D. N. Burrows (PSU), and S. Patel (NASA/MSFC) report on behalf of a larger collaboration: We executed a Chandra ToO observation of GRB 051221A beginning at 2005-12-22 13:55:20 UT (130 ks after the burst) and lasting for 30.2 ks. A fading X-ray source was found within the XRT error circle (Burrows et al., GCN 4366) at RA(J2000) = 21:54:48.626 Dec(J2000) = +16:53:27.16 Chandra positions have typical uncertainties of 0.5 arcseconds (radius). This position is 0.55 arcseconds from the optical counterpart identified by Bloom et al. (GCN 4368) and 0.34 arcseconds from the position reported by Berger (GCN 4369)