Unpicking the exceptional properties of the first TeV emitting gamma-ray burst

Please find attached our mid-cycle proposal for observations of GRB 190114C. Please let us know if you have any questions or issues with the submission. Best Wishes, Andrew Levan -1395390684 Assigned ID: 677 ----- Attempting Submission 1 (Wed Jan 30 22:51:09 GMT 2019) ----- Please fid attached our submission of GO 15979 for further observations of GRB 190114C. In case of any questions please let us know. Best Wishes, Andrew -91742619 ----- Attempting Submission 1 (Tue Apr 09 21:14:33 GMT 2019) ----- ----- Attempting Submission 2 (Wed Jul 24 20:36:32 GMT 2019) ----- Unpicking the exceptional properties of the first TeV emitting gamma-ray burst Several thousand gamma-ray bursts (GRBs) have now been detected, lasting from a fraction of a second to several hours, and with spectral energies peaking in the hundreds of keV range. A handful of bursts have been detected at GeV energies, but very recently GRB 190114C became the first GRB to be identified in the TeV regime via the detection of a flash of Chernkov light by the MAGIC telescope. This detection offers a new window on the GRB phenomena, probing the generation of these extreme photons, as well as a route to testing the scattering of such photons off the Extragalactic Background Light (EBL). The environment of the burst is also exceptional, being extremely dense and perhaps indicating a link between the very high energy emisison and environment, as suggested by some models. Our proposed HST observaitons will track the late time behaviour of the counterpart, disentangle the supernova, afterglow and host emission and determine if the physics of this unique burst differs from that seen in other examples. The observations will also characterise the environment in emission, dissecting it at higher resolution than possible from the ground and tying the emission to absorption properties. Finally, the observations will measure the optical photon density close to the GRB itself (i.e. in the host), and hence the contribution of these photons to the scattering of very high energy light (i.e. the total of local to the burst + EBL). This in turn will enable the determination of the true energetics of the burst at TeV energies and test scattering models in the EBL, both key questions in high energy astrophysics and cosmology. We will obain a series of observations of GRB 190114C in the F606W, F775W, F850LP, F110W and F160W filters. Each of these exposures will use a standard 3-point dither. We will place the WFC observations close to the edge of the chip using the CTE aperture in order to mitigate CTE effects, and will use the standard IR aperture for infrared observations. The purpose of these observations is to measure the long term decay of the counterpart of GRB 190114C, in tandem with earlier observations. This final epoch will be used for the purposes of host galaxy subtraction. Stellar Physics 0 false false false false false false false SUPPORTED EXT-STAR GAMMA RAY BURSTER J2000 J2000 ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F775W ACS/WFC Imaging No No F850LP ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F775W ACS/WFC Imaging No No F850LP ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F775W ACS/WFC Imaging No No F850LP WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W POS-TARG DITHER 0.605 LINE false false 3 41.788 WFC3-IR-DITHER-LINE-3PT 1

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