Abstract
A variety of scientific results have been achieved over the last 10 years with the GROND simultaneous 7-channel imager at the 2.2 m telescope of the Max-Planck Society at ESO/La Silla. While designed primarily for rapid observations of gamma-ray burst afterglows, the combination of simultaneous imaging in the Sloan g′r′i′z′ and near-infrared JHKs bands at a medium-sized (2.2 m) telescope and the very flexible scheduling possibility has resulted in an extensive use for many other astrophysical research topics, from exoplanets and accreting binaries to galaxies and quasars.
Highlights
An increasing number of scientific questions require the measurement of spatially and spectrally resolved intensities of radiation from astrophysical objects
A total of 842 gamma-ray burst (GRB) were promptly localized by the Neil Gehrels Swift Observatory and 301 by other missions2 between May 2007 and September 2016. 879 of these happened at declination smaller than +36d. 5, out of which 513 were followedup with GROND. 256 of the 464 long-duration GRBs were detected, and 17 of the 49 shortduration GRBs (Fig. 3)
A first exciting case to demonstrate the advantage of the GROND seven-band imaging was GRB 071031: Superimposed onto the canonical afterglow emission, we found bumps which have a harder spectral energy distribution (SED) and appear to be similtaneous in the optical/NIR and at X-rays
Summary
An increasing number of scientific questions require the measurement of spatially and spectrally resolved intensities of radiation from astrophysical objects. After a short description of the main features of the instrument and operational aspects (§2), I describe some of our prime scientific results obtained via GROND observations, foremost for GRBs (§3) and transients (§4), and other science topics where color information on short timescales is important (§5 − 9). While this is predominantly a review, it contains hitherto unpublished results, e.g. on the discovery of a hitherto unknown T5 brown dwarf
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