GCN Circular 20776
Subject
LIGO/Virgo G275697: REM optical/NIR observations
Date
2017-02-28T22:10:50Z (8 years ago)
From
Andrea Melandri at INAF-OAB <andy.melandri@gmail.com>
A. Melandri, P. D'Avanzo (INAF-OAB), G. Greco (Urbino University/INFN Firenze), D. Fugazza, S. Covino, (INAF-OAB), E. Palazzi (INAF-IASF Bo), M. Branchesi (Urbino University/INFN Firenze), L. Amati (INAF-IASF Bo), L. A. Antonelli, (INAF-OAR), S. Ascenzi (INAF-OAR), M.T. Botticella (INAF-OAC), S. Campana (INAF-OAB), 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. 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 (GRAWITA) report:
We carried out optical/NIR follow-up observations of the LIGO/Virgo GW trigger G275697 (LVC GCN Circ. 20763) with the 60-cm robotic telescope REM located at the La Silla Observatory (Chile). The observations were carried out on 2017 Feb 28 from 00:12:54 UT to 04:59:04 UT (from 5.25 to 10.04 hours after T0, LVC GCN Circ. 20763), simultaneously in the g, r, i, z and H bands.
We observed the twenty brightest (according to the B magnitude reported in the GLADE catalogue) galaxies within the bayestar probability sky map visible from La Silla. The galaxies with a catalogued distance in the range 80-280 Mpc (evaluated on the basis of directional distance information, Singer et al. 2016, ApJL 829, 15) and brighter than absolute B_Mag ~ -21.3 were selected within the 30% containment probability contour of the sky map using the GWsky script (https://github.com/ggreco77/GWsky).
RA(J2000) Dec(J2000) Dist(Mpc) Mag(B)
-------------------------------------------------------
174.160 -38.3830 275.633 -22.09
163.889 -28.5261 112.893 -22.04
171.471 -35.3945 136.773 -21.97
171.850 -35.0727 153.462 -21.90
164.899 -29.5633 86.5000 -21.87
164.007 -28.3702 257.040 -21.84
171.087 -35.0165 240.991 -21.65
164.058 -28.9641 277.971 -21.64
175.374 -38.4629 246.604 -21.56
168.117 -32.1972 243.220 -21.49
170.986 -34.8010 242.103 -21.47
175.459 -37.9629 259.418 -21.46
172.862 -37.4394 269.153 -21.43
174.692 -37.7118 133.660 -21.41
168.150 -33.3339 140.605 -21.40
160.274 -24.4960 230.144 -21.40
165.627 -29.8585 248.886 -21.34
164.473 -28.3671 215.774 -21.31
171.862 -34.9971 276.694 -21.30
173.608 -36.8816 236.592 -21.29
A preliminary analysis reveals no obvious optical/NIR candidate counterpart in the above galaxies down to the following magnitudes: r > 19.3, H > 16.5 (AB, 3sigma upper limit, calibrated against the APASS and 2MASS catalogues, respectively).
Further analysis is in progress.