# ASASSN-15ga magnitudes from Swift UVOT # generated Tue Dec 19 19:44:57 CST 2017 using version 2015.1 # of Peter Brown's photometry pipeline # and version Swift_Rel4.5(Bld34)_27Jul2015 of HEASOFT # # Data comes from the Swift Data Center # A 5 arcsec aperture is used to measure the counts for the coincidence loss correction, # a 3 or 5 arcsec source aperture (based on the error) was used for the aperture photometry # subtracting off the galaxy count rate in a template image (if available), # and applying an aperture correction as appropriate (based on average psf in Swift CALDB) # and zeropoints from Breeveld et al. (2011) which update Poole et al. (2008) # including a time-dependent sensitivity loss # to put the magnitudes on the UVOT photometric system described in that paper. # The sensitivity correction has been updated based on the 2015 redetermination. # # Brown, P. J., Holland, S. T., Immler, S., et al. 2009, ApJ, 137, 4517 # Brown, P. J., et al. 2014, Ap&SS, submitted # Breeveld, A. A., Landsman, W., Holland, S. T., et al. 2011, in AIP Conf. Proc. 1358, # Gamma-Ray Bursts 2010, ed. J. E. McEnergy, J. L. Racusin, & N. Gehrels # (Melville, NY: AIP), 373; arXiv:1102.4717 # Poole, T. S., Breeveld, A. A., Page, M. J., et al. 2008, MNRAS, 383, 627 # # # # The underlying galaxy had the following count rates # in a 5 arcsec aperture at the source position # (missing filters list 0 but used a background region similar to the SN ): # Galaxy count rates in 5" aperture # V 54.3177 2.13819 # B 64.3055 2.59515 # U 18.1222 0.826372 # UVW1 2.70572 0.138854 # UVM2 0.449970 0.0282105 # UVW2 1.07409 0.0587868 # # Supernova is right on top of host galaxy nucleus (maybe an arcsec or two off) # Underlying galaxy count rates are high in optical, but only hw windows were used # # Filter MJD[days] Mag MagErr 3SigMagLim 0.98SatLim[mag] Rate[c/s] RateErr[c/s] Ap[arcsec] Frametime[s] Exp[s] Telapse[s] # UVW2 57111.9832 NULL NULL 18.207 10.069 -0.075 0.108 3.0 0.0036 75.92 79.77 UVW2 57113.3639 18.649 0.355 18.725 11.098 0.311 0.102 3.0 0.0110 196.62 199.77 UVW2 57117.3547 NULL NULL 18.724 11.098 0.192 0.094 3.0 0.0110 196.71 199.86 UVW2 57119.6169 NULL NULL 18.724 11.098 0.081 0.087 3.0 0.0110 196.61 199.76 # UVM2 57111.9866 NULL NULL 18.135 9.536 0.081 0.076 3.0 0.0036 75.92 79.77 UVM2 57113.3693 NULL NULL 19.231 10.560 0.069 0.035 3.0 0.0110 494.19 505.24 UVM2 57117.3612 NULL NULL 19.366 10.560 0.079 0.032 3.0 0.0110 686.44 700.61 UVM2 57119.6232 NULL NULL 19.341 10.560 0.050 0.031 3.0 0.0110 652.27 665.96 # UVW1 57111.9780 NULL NULL 17.891 10.136 -0.091 0.179 3.0 0.0036 75.92 79.78 UVW1 57113.3595 NULL NULL 18.094 11.179 0.507 0.189 3.0 0.0110 117.87 119.76 UVW1 57117.3503 17.996 0.352 18.092 11.179 0.599 0.194 3.0 0.0110 117.88 119.77 UVW1 57119.6125 NULL NULL 18.044 11.185 0.270 0.184 3.0 0.0110 117.90 119.78 # U 57111.9797 17.142 0.309 17.611 11.100 3.013 0.857 3.0 0.0036 75.92 79.77 U 57113.3608 16.776 0.266 17.376 11.100 4.222 1.034 3.0 0.0036 37.87 39.78 U 57117.3515 17.361 0.417 17.380 11.100 2.465 0.946 3.0 0.0036 37.86 39.78 U 57119.6138 NULL NULL 17.380 11.100 1.742 0.911 3.0 0.0036 37.86 39.78 # B 57111.9814 16.554 0.258 17.293 12.057 10.528 2.503 3.0 0.0036 75.92 79.78 B 57113.3620 16.291 0.227 17.156 12.055 13.417 2.803 3.0 0.0036 37.86 39.77 B 57117.3528 16.175 0.208 17.160 12.056 14.924 2.863 3.0 0.0036 37.86 39.78 B 57119.6150 16.591 0.284 17.165 12.057 10.176 2.657 3.0 0.0036 37.86 39.78 # V 57111.9849 NULL NULL 16.194 10.800 0.003 1.735 3.0 0.0036 75.93 79.78 V 57113.3657 NULL NULL 16.047 10.799 2.332 1.980 3.0 0.0036 37.87 39.78 V 57117.3564 NULL NULL 16.043 10.797 5.120 2.093 3.0 0.0036 37.86 39.78 V 57119.6186 15.615 0.296 16.037 10.796 8.127 2.218 3.0 0.0036 37.86 39.78 #