ToO Gamma-Ray Burst Counterpart Observations

Details ToO Gamma-Ray Burst Counterpart Observations ToO Gamma-Ray Burst Counterpart Observations

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..220v&link_type=abstract

NOAO Proposal ID #2000A-0220

Astronomy and Astrophysics

Astronomy

Scientific paper

In the last years, the field of Gamma-Ray Bursts (GRBs) has seen enormous progress. In spite of this, GRBs still remain a mystery. The launch of the HETE-II satellite will open up a new era in GRB astronomy. Besides immediate (< 1 min.) accurate (< 1 arcmin) localizations of GRBs, HETE-II will also trigger upon short duration bursts, which have not been studied to date, and which may represent a different class of GRBs. We propose to continue our programme of ToO observations in an effort to understand the nature of the progenitors of GRBs. We request `target-of-opportunity' observation time (override status) to monitor the arcminute sized error boxes of five GRBs as soon as possible after the burst, and during the next two nights. We request deep B, V, R and I imaging (limiting magnitude ~ 24) of the GRB error box. The data will be inspected immediately, and if an optical transient (OT) is identified we also request longer time scale monitoring to study the host galaxy and to establish the (non)-existence of an underlying SN. The requested observations take full advantage of the queue scheduling capability of WIYN, the match of the CTIO/WIYN imager fields of view to the expected X-ray counterpart error circles, and the compatibility between the required sensitivity and that obtainable with CTIO/WIYN telescopes. In addition, using WIYN should provide the least disruption of the accepted programs of other KPNO users. Results from the counterpart searches will be quickly reported using electronic means (including BACODINE/GCN and, where appropriate, IAUCs).

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