We present an analysis of the star formation history (SFH) of the transition-type (dIrr/dSph) Local Group galaxy LGS-3 (Pisces) based on deep photometry obtained with the Advanced Camera for Surveys onboard the Hubble Space Telescope. Our observations reach the oldest main-sequence turnoffs at high signal to noise, allowing a time resolution at the

We report on the continuous Swift follow-up observations of the black hole candidate MAXI J1659-152 (ATel #2873, ATel #2877, GCN #11296) currently in its low luminosity, hard state (ATel #3201). Two more observations were performed after our previous report (ATel #3201). The observations were taken on 2011-03-14 20:01:45 UT for 2.4 ks, and on 2011

We report on a Swift follow-up observation of the X-ray transient MAXI J1659-152 (ATel #2873, ATel #2877, GCN #11296). This source is suggested to be a stellar-mass black hole candidate (Kalamkar et al. 2011, arXiv:1012.4330). The source also has a very short orbital period ~2.4 hours (Kuulkers et al. 2011, arXiv:1102.2102). The optical counterpart

Following the gamma-ray, VHE (E>100 GeV) flare of the blazar 1ES 0806+525 (RA:08h09m49.2s DEC:+52d18m58.2s, z=0.138) detected by MAGIC on 2011 February 25 (ATel #3192), we performed a Swift target of opportunity observation starting on February 26. Swift monitored the source in photon counting mode with 5 daily observations for a total exposure of

Context. Low-ionisation, nuclear emission-line region (LINER) nuclei are said to be different from other active galactic nuclei (AGN) due to the presence of complex absorbing structures along the line-of-sight and/or an inefficient mode of accretion onto the supermassive black hole. However, this is still open. Aims: We investigate the broad band X

We present the first results of a narrow-band photometric study of the massive galaxy cluster XMMU J2235.3-2557 at z= 1.39. We obtained deep H narrow-band imaging with the Near InfraRed Imager and Spectrometer on Gemini North, corresponding to Hα emission at the cluster's redshift. Our sample consists of 82 galaxies within a radius of ˜500 kpc, 10