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SALT-HRS observation of the blazar TXS 0506+056 associated with IceCube-170922A

ATel #10830; B. van Soelen (UFS), David A. H. Buckley (SALT/SAAO), Markus Boettcher (NWU)
on 7 Oct 2017; 13:26 UT
Credential Certification: David Buckley (dibnob@saao.ac.za)

Subjects: Optical, Neutrinos, Blazar

Referred to by ATel #: 10838, 10840, 10844, 10861, 10890

The blazar TXS 0506+056, which has been proposed as the counterpart to the neutrino event IceCube-170922A, has recently been reported to show increased optical and gamma-ray emission (ATel #10817, #10801, #10799, #10794, #10792, #10791, #10787, #10773). We undertook a 2500 second observation of this sources (starting 2017-09-29 01:52 UT) with the Southern African Large Telescope (SALT) using the High Resolution Spectrograph (HRS) in low-resolution mode (R~16000), covering the wavelength range ~3899 - 800 Angstrom. The spectrum is featureless with no indication of the lines from the host galaxy. The only visible lines are the NaD lines from Galactic absorption. This is consistent with observations of a non-thermally dominated blazar and are identical to that reported in ATel #10799.