Difference: GCNCIRCULAR21610 ( vs. 1)

Revision 12017-08-20 - ShaonGhosh

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META TOPICPARENT	name="LVCGCNs"

TITLE: GCN CIRCULAR
NUMBER: 21610
SUBJECT: LIGO/VIRGO G298048: SALT optical spectra of the candidate optical/NIR counterpart of the gravitational wave G298048 in NGC4993.
DATE: 17/08/20 06:14:37 GMT
FROM: Stephen Potter at SAAO <sbpotter6@gmail.com>

M. Shara (AMNH), T. Williams (SAAO), P. Vaisanen (SAAO/SALT), S. Potter (SAAO), E. Romero Colmenero (SAAO/SALT), S. Crawford (SAAO), D. Buckley (SAAO), J Cooke (Swinburne), Igor Andreoni (Swinburne), Tyler Pritchard (Swinburne), Jirong Mao (YNAO)

Spectra of an unresolved source at coordinates RA=197.4504, DEC=-23.3815 near the galaxy NGC 4993, obtained with the Robert Stobie Spectrograph on the Southern African Large Telescope at UT 17:07:19.703 on 18 August 2017 and at UT 16:58:32.764 on 19 August 2017 during early twilight. The spectra extends between 3600-8000 Angstroms with a resolution of ~300. The spectra is heavily blended with the host galaxy. After subtraction of the host galaxy spectra from the 18 August, the source shows a spectra increasing in flux from 8000 A to 5000 A, which then decreases in flux after 4500 A. The spectra from the 19 August 2017 was taken early twilight and too noisy to say anything definitive.

-- ShaonGhosh - 20 Aug 2017

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