TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1241 SUBJECT: GRB020127: Chandra Observations and Prospective Counterparts DATE: 02/02/04 14:06:53 GMT FROM: Derek Fox at CIT Derek W. Fox (Caltech) reports on behalf of the Caltech-NRAO-CARA GRB colloboration: "We have initiated a two-pointing sequence of Chandra ACIS-I observations of this event (HETE #1902, GCN 1229) in order to identify its X-ray counterpart. Analysis of the first 10-ksec observation (start time Jan 31.95 UT) reveals the presence of eleven probable X-ray sources within or near the joint HETE-IPN localization (GCN 1232). Correcting the Chandra aspect by roughly one arcsec by reference to three bright USNO stars with X-ray counterparts in the field, we derive the following positions, approximate counts, and (wavdetect) uncertainties: Source RA Dec Cts Notes ================================================================ cxo01 08 14 42.57(4) +36 49 11.2(5) 54 DPOSS cxo02 08 14 52.00(7) +36 43 39.4(9) 18 cxo03 08 15 17.83(6) +36 39 11.9(8) 47 cxo04 08 15 24.36(2) +36 41 01.1(5) 134 USNO (faint) cxo05 08 15 27.35(9) +36 40 51.7(12) 25 cxo06 08 15 27.93(11) +36 49 40.5(8) 27 cxo07 08 15 33.58(7) +36 46 14.8(11) 22 USNO (faint) cxo08 08 15 39.17(6) +36 47 49.1(12) 46 USNO+2MASS cxo09 08 15 40.77(9) +36 43 17.0(10) 19 cxo10 08 15 42.48(5) +36 45 36.1(8) 108 USNO+2MASS cxo11 08 15 44.77(9) +36 41 13.1(8) 28 ================================================================ Numbers in parentheses indicate the uncertainty in the preceding digits. Table notes indicate the presence of a likely counterpart to the X-ray source in one or more sky catalogs (DPOSS catalog for the field available at http://www.srl.caltech.edu/~react/GRB020127.html). Please note that these results are preliminary and subject to revision. The Chandra follow-up observation is currently scheduled for Feb 11 UT."