The distant, galaxy cluster environment of the short GRB 161104A at $zsim 0.8$ and a comparison to the short GRB host population. (arXiv:2007.10372v2 [astro-ph.HE] UPDATED)

The distant, galaxy cluster environment of the short GRB 161104A at $zsim 0.8$ and a comparison to the short GRB host population. (arXiv:2007.10372v2 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Nugent_A/0/1/0/all/0/1">Anya E. Nugent</a> (Northwestern, CIERA), <a href="http://arxiv.org/find/astro-ph/1/au:+Fong_W/0/1/0/all/0/1">Wen-fai Fong</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dong_Y/0/1/0/all/0/1">Yuxin Dong</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Palmese_A/0/1/0/all/0/1">Antonella Palmese</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Leja_J/0/1/0/all/0/1">Joel Leja</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Escorial_A/0/1/0/all/0/1">Alicia Rouco Escorial</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Blanchard_P/0/1/0/all/0/1">Peter K. Blanchard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Paterson_K/0/1/0/all/0/1">Kerry Paterson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chornock_R/0/1/0/all/0/1">Ryan Chornock</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Monson_A/0/1/0/all/0/1">Andrew Monson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nicholl_M/0/1/0/all/0/1">Matt Nicholl</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Berger_E/0/1/0/all/0/1">Edo Berger</a>

We present optical observations of the Swift short-duration gamma-ray burst
(GRB) GRB 161104A and its host galaxy at $z=0.793 pm 0.003$. We model the
multiband photometry and spectroscopy with the stellar population inference
code Prospector, and explore the posterior using nested sampling. We find that
the mass-weighted age $t_m = 2.12^{+0.23}_{-0.21}$~Gyr, stellar mass
$log{(M/M_odot)} = 10.21 pm 0.04$, metallicity $log{(Z/Z_odot)} =
0.08^{+0.05}_{-0.06}$, dust extinction $A_V = 0.08^{+0.08}_{-0.05}$ mag, and
the star formation rate $text{SFR} = 9.9 times 10^{-2} M_odot$~yr$^{-1}$.
These properties, along with a prominent 4000 Angstrom break and optical
absorption lines classify this host as an early-type, quiescent galaxy. Using
Dark Energy Survey galaxy catalogues, we demonstrate that the host of GRB
161104A resides on the outskirts of a galaxy cluster at $zapprox 0.8$,
situated $approx 1$ Mpc from the likely brightest cluster galaxy. We also
present new modeling for 20 additional short GRB hosts ($approx33%$ of which
are early-type galaxies), finding population medians of $log(M/M_odot) =
9.94^{+0.88}_{-0.98}$ and $t_m = 1.07^{+1.98}_{-0.67}$~Gyr ($68%$ confidence).
We further find that the host of GRB 161104A is more distant, less massive, and
younger than the four other short GRB hosts known to be associated with galaxy
clusters. Cluster short GRBs have faint afterglows, in the lower $approx 11%$
($approx 30%$) of observed X-ray (optical) luminosities. We place a lower
limit on the fraction of short GRBs in galaxy clusters versus those in the
field of $approx 5-13%$, consistent with the fraction of stellar mass
$approx 10-20%$ in galaxy clusters at redshifts $0.1 leq z leq 0.8$.

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