Tomasz Bulik

TL;DR: In this article, the authors studied the contribution of binary black hole mergers from the first metal-free stars in the Universe (Pop III) to gravitational wave detection rates and found that the merger rate of these Pop III BH-BH systems is relatively small ( 1 per cent) contribution of these stars to low-redshift BH/BH mergers.

TL;DR: In this article, a very high energy (VHE) emission from the quasar PKS 1510−089 (z = 0.361) was detected with a statistical significance of 9.2 standard deviations in 15.8 h of H.E.S. data taken during March and April 2009.

TL;DR: Two directional searches for persistent GWs using data from the LIGO S5 science run are performed: one optimized for pointlike sources and one for arbitrary extended sources, finding no evidence to support the detection of GWs.

TL;DR: Very-high-energy γ-rays observed in the bright GRB 180720B deep in the GRB afterglow are reported—ten hours after the end of the prompt emission phase, when the X-ray flux had already decayed by four orders of magnitude.

TL;DR: The deeper gamma-ray observation of the source has revealed a large shell-type structure with similar position and extension as the radio SNR, thus confirming their association, and the derived lower limit on the distance of the SNR of 3.2 kpc is used together with radio and X-ray data.