Exploring nine simultaneously occurring transients on April 12th 1950
نویسندگان
چکیده
Nine point sources appeared within half an hour on a region $\sim$ 10 arcmin of red-sensitive photographic plate taken in April 1950 as part the historic Palomar Sky Survey. All nine are absent both previous and later images, modern surveys with CCD detectors which go several magnitudes deeper. We present deep images 10.4-meter Gran Telescopio Canarias (GTC), reaching brightness $r \sim 26$ mag, that reveal possible optical counterparts, although these counterparts could equally well be just chance projections. The incidence transients investigated is far higher than expected from known detection rates to e.g.\ flaring dwarf stars, Fast Radio Bursts (FRBs), Gamma Ray (GRBs) or microlensing events. One explanation plates have been subjected unknown type contamination producing mainly varying intensities along some mechanism concentration radius plate. If can fully excluded, another possibility fast (t $<0.5$ s) solar reflections objects near geosynchronous orbits. An alternative route confirm latter scenario by looking for First Survey where multiple follow line.
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ژورنال
عنوان ژورنال: Scientific Reports
سال: 2021
ISSN: ['2045-2322']
DOI: https://doi.org/10.1038/s41598-021-92162-7