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GRB 000201

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  541
SUBJECT: GRB000201, Radio Observations
DATE:    00/02/10 18:56:34 GMT
FROM:    Dale A. Frail at NRAO  <dfrail@nrao.edu> D. A. Frail (NRAO) and E. Berger (Caltech) report on behalf of a large collaboration:

"Starting on February 10.15 UT we used the VLA to observe a field centered at the position of the optical transient identified by Boer, Atteia and Klotz (GCN 535). There are no radio sources above a 3-sigma threshold of 0.18 mJy within a 10-arcsecond radius of the OT."

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TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  536
SUBJECT: GRB000201 Optical Observations
DATE:    00/02/09 03:34:54 GMT
FROM:    Robert Kehoe at U.Michigan/ROTSE  <kehoe@sdss1.physics.lsa.umich.edu> R. Kehoe (Univ. of Michigan), J. Wren, R. Balsano (Los Alamos) and B. Lee (Fermilab) report on behalf of the ROTSE collaboration (U. Michigan/LANL/LLNL).

We have observed the error box of GRB000201 provided by the Final and LocBurst Position Notices dated 1-Feb-00 using the ROTSE-I telephoto camera array.  The initial BACODINE Notice localization fell below our elevation cut and was not observed.  The ROTSE-I trigger protocol for  Final Notices begins with 20 second exposures for the first few frames followed by 80 second exposures thereafter.  All LocBurst response images are 80 second exposures.  We have searched the LocBurst 1 sigma error region in the first half hour of observations and found no significantly varying objects.  We have also searched all images at the location of the optical transient described in GCN #535 at RA = 139.03667, DEC = 18.10361 (J2000).  For the nine LocBurst observations, this position falls in the overlap region between cameras 'a' and 'd', giving a degree of redundancy.  The times and sensitivities (5 sigma cut-off) of these observations are:

No object is detected at the transient location in any image in any camera.  To further explore the possibility of a dim counterpart, we have co-added the last four LocBurst images (see Table).  No object is detected at the transient location in this image.  Given our observation that any source at this location is around mag. 16 or dimmer within 5 minutes of the TAROT position, we believe this is not the optical counterpart to GRB000201. Further analysis to explore the wider field is in progress.

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TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  535
SUBJECT: GRB 000201: TAROT optical observations
DATE:    00/02/08 17:49:02 GMT
FROM:    Michel Boer at CESR-CNRS  <Michel.Boer@cesr.fr> M. Boer, J.L. Atteia, A. Klotz, CESR/CNRS communicates:

TAROT has imaged the position of  BATSE trigger 7976 on Feb. 1, 2000, at 03:02UT. A transient source appears at T0 + 55min, consistent with the BATSE LOCBURST and the IPN positions (K. Hurley, private communication). No prior image of this source has been acquired, because it is too far from the BATSE FINAL position. The source is at the following 2000.0 position: 9h 16m 08.8 +18d 06' 13", +-5" and its apparent unfiltered magnitude is 15 +-1. We could not see it on subsequent frames taken at least 30 min after. We  warn potential observers that a high background of unidentified transient sources has been observed in this region, though it is the only one in the IPN error box. The TAROT image is at the following URL: http://www.cesr.fr/~boer/tarot/GRB000201.html

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