Recent GRB investigations on archival astronomical plates

Astronomy and Astrophysics – Astronomy

Scientific paper

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Gamma Ray Bursts, Astronomical Plates

Scientific paper

The deep archival astronomical plates represent a valuable tool for optical analyses of gamma-ray bursts positions. We report on the results obtained on astronomical plates from the Royal Observatory Edinburgh and Sonneberg Observatory for selected precisely localized GRBs (by BeppoSAX and RXTE). The recent scenario connecting GRBs to star forming regions in distant galaxies may accounts for long-term recurrency (of order of tens of years) of GRB triggers from a particular galaxy. The analyses on deep sky patrol plates (up to mag 23) taken long time before recently detected GRB triggers allow for the first time to look for such recurrent optical afterglows. The position of bright optical transient associated with GRB 990123 reaching magnitude 9 has been also investigated on Sonneberg Sky Patrol plates. The results of these analyses will be presented and discussed.

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