The mysterious cosmological transient GRB 110328A/J164449.3+573451

Details The mysterious cosmological transient GRB 110328A/J164449.3+573451 The mysterious cosmological transient GRB 110328A/J164449.3+573451

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop70205t&link_type=abstract

Spitzer Proposal ID #70205

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The behaviour of GRB 110328A is completely unlike any previously detected gamma-ray burst, showing a long series of X-ray flares lasting over several days (indeed it is ongoing at the time of writing). Given this it was first identified as a likely Galactic transient, despite its high Galactic latitude, and given the alternative designation J164449.3+573451. However, we have found that the only optical source in the Swift X-ray error circle is a galaxy at redshift z=0.35. Variability has now been detected at nIR and radio wavelengths but not in the optical, confirming its cosmological nature, and suggesting the transient is an intrinsically red or dust enshrouded source. We therefore propose Spitzer ToO observations of the field as part of a campaign to monitor its spectral energy distribution, which will provide a key constraint on models of this remarkable event.

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