TITLE:   GCN CIRCULAR
NUMBER:  21532
SUBJECT: LIGO/Virgo G298048: REM optical/NIR observations of candidate in NGC 4993
DATE:    17/08/18 02:00:40 GMT
FROM:    Paolo D'Avanzo at INAF-OAB  <pda.davanzo@gmail.com>

A. Melandri, S. Campana, S. Covino, P. D'Avanzo (INAF-OAB), G. Greco (Urbino University/INFN Firenze), M. Branchesi (GSSI), D. Fugazza, L. Amati (INAF-IASF Bo), L. A. Antonelli, (INAF-OAR), S. Ascenzi (INAF-OAR), S. Benetti (INAF-OAPD), M.T. Botticella (INAF-OAC),  E. Cappellaro (INAF-OAPD), V. D'Elia (INAF-ASDC), F. Getman (INAF-OAC), A. Grado (INAF-OAC), L. Limatola (INAF-OAC), M. Lisi (INAF-OAR), L. Nicastro (INAF-IASF Bo), E. Palazzi (INAF-IAFS Bo), E. Pian (SNS-Pisa), S. Piranomonte (INAF-OAR), L. Pulone (INAF-OAR), A. Rossi (INAF-IASF Bo), G. Stratta (Urbino University/INFN Firenze), G. Tagliaferri (INAF-OAB), V. Testa (INAF-OAR), L . Tomasella (INAF-OAPD), S. Yang (INAF-OAPD), E. Brocato (INAF-OAR) on behalf of GRavitational Wave Inaf TeAm report:


We carried out optical/NIR follow-up observations of the LIGO/Virgo GW trigger G298048 (LVC GCNs 21509, 21513) with the 60-cm robotic telescope REM located at the La Silla Observatory (Chile) by performing targeted observations of catalogued galaxies in the LVC skymap. The observations were carried out simultaneously in the g, r, i, z and H bands starting on 2017 Aug 18 at 23:11:29 UT. 

In the optical/NIR images of the galaxy NGC 4993, obtained starting from 01:29:28 UT at airmass~3, we clearly detect in all bands the optical source reported by Coulter et al. (LVC GCN 21529), Allam et al. (LVC GCN 21530) and Yang et al. (LVC GCN 21531)

Further analysis and observations are ongoing.