Norwegian Astronomical Society - Variable Star Section.

Observations from 2007 August 21-31 UT [JD 2454334-2454344].

Observer: Bjorn H. Granslo [GRL].
Location: Fjellhamar, Norway.
Instruments: 203-mm SCT; 100-mm refractor; 7x50 binoculars.
Observations: Visual, Pogson step estimates and fractional estimates.
Report identification: grl_2007_08d.vis.

Variable YYYYMMDD(UT) Magn Obs Instrum. Mag.ref Estimates
CASrho 20070821.96 4.6 GRL B7x50 NAS.VSS B-4;D+1 [1]
CETomicron 20070823.09 8.9 GRL C203;100x NAS.VSS P-8;S=V;T+6 [2]
CRBR 20070825.943 12.7 GRL C203;133x NAS.VSS R-5;T+1 [2]
CRBR 20070827.926 12.8 GRL C203;133x NAS.VSS R-6;S-2;T=V [2]
CRBR 20070831.853 13.1 GRL C203;133x NAS.VSS S-5;T-2 [2]
CRBS 20070825.94 8.3 GRL L100;25x NAS.VSS F-2;G+3 [1]
CRBT 20070825.94 10.4 GRL C203;100x NAS.VSS U-6;X+2 [1]
CRBT 20070827.92 10.4 GRL C203;100x NAS.VSS U-6;X+2 [1]
CRBT 20070831.85 10.4 GRL C203;100x NAS.VSS U-6;X+2 [1]
CYGAF 20070821.98 7.7 GRL L100;25x NAS.VSS E-5;F-2;G+5 [1]
CYGSS 20070821.955 8.3 GRL C203;100x NAS.VSS B=V;C+4 [1]
CYGSS 20070823.078 8.3 GRL C203;100x NAS.VSS B=V;C+4 [2]
CYGSS 20070824.008 8.4 GRL C203;100x NAS.VSS B-1;C+3 [1]
CYGSS 20070825.958 8.4 GRL C203;100x NAS.VSS B-1;C+3 [1]
CYGSS 20070827.919 8.5 GRL C203;100x NAS.VSS B-2;C+3 [1]
CYGSS 20070831.855 9.8 GRL C203;100x NAS.VSS E-4;F=V [1]
CYGW 20070821.97 6.5 GRL L100;25x NAS.VSS D-2;E+3 [1]
CYGchi 20070825.96 8.4 GRL L100;25x NAS.VSS L-2;M+4 [1]
GEMU 20070828.096 10.6 GRL C203;133x NAS.VSS D(8)V(2)ZK [2]
LYNY 20070821.97 7.5 GRL L100;25x NAS.VSS E-2;F+2 [1]
OPHRS 20070827.92 10.6 GRL C203;100x NAS.VSS P-1;R+3 [1]
OPHRS 20070831.85 11.0 GRL C203;100x NAS.VSS R-1;S+5 [1]
PEGAG 20070821.99 9.0 GRL L100;25x NAS.VSS K-3;T+2 [1]
PERTX 20070824.02 10.9 GRL C203;133x NAS.VSS D-4;E-1;F+3 [1]
SCTR 20070821.96 5.3 GRL B7x50 NAS.VSS P-5;E+1 [1]
SGER 20070822.00 9.3 GRL L100;40x NAS.VSS G-2;H+1 [1]
SGRV5558 20070827.907 8.6 GRL L100;40x NAS.VSS F-3;H+6 [2]
SGRV5558 20070831.845 8.8 GRL L100;40x NAS.VSS F-5;H+4 [1]
SN2007gr 20070824.017 12.7 GRL C203;133x NAS.VSS H-6;K-2;L+1 [2]
SN2007gr 20070828.072 12.7 GRL C203;133x NAS.VSS H-6;L+2;M+5 [2]
TRIR 20070828.07 9.0 GRL C203;83x NAS.VSS H-6;L+4 [1]
UMAZ 20070821.98 7.7 GRL L100;25x NAS.VSS C-4;D+2 [1]
VULV 20070821.99 9.1 GRL L100;40x NAS.VSS K-5;L-1;M+4 [1]
VULV458 20070821.945 10.5 GRL C203;100x NAS.VSS G-4;H+1;K+6 [1]
VULV458 20070823.076 10.8 GRL C203;100x NAS.VSS G-6;K+3 [2]
VULV458 20070824.006 10.9 GRL C203;100x NAS.VSS G-7;K+1 [1]
VULV458 20070825.959 10.9 GRL C203;100x NAS.VSS H-3;K+1 [1]
VULV458 20070827.918 11.3 GRL C203;100x NAS.VSS K-2;L+2 [1]
VULV458 20070831.856 11.4 GRL C203;100x NAS.VSS K-3;L+1 [1]

Remarks:
(1) The prototype dwarf nova U Geminorum was detected in outburst in
morning twilight on Aug 28 UT.

(2) V458 Vul comparison stars (V-magnitudes from Miles and ASAS-3):
G = 10.15 [HDE 345266]; H = 10.51 [HDE 345374];
K = 11.14 [HDE 345264]; K = 11.47 [TYC 1628-1108].
V458 Vul = Nova Vul 2007: R.A. = 19h54m25s, Decl. = +20o52'.9 (2000.0).

(3) Supernova 2007gr comparison stars (provisional V-mags. by Henden):
H = 12.01 [TYC 2337-0542]; K = 12.41 [TYC 2337-0392];
L = 12.87 [GSC 2337-0180]; M = 13.25 [GSC 2337-0310].
SN 2007gr in NGC 1058: R.A. = 02h43m28s.0, Decl. = +37o50'45" (2000.0).

(4) R CrB comparison stars (V-magnitudes from NAS.VSS):
R = 12.24 [GSC 2039-1463]; S = 12.65 [TYC 2040-0765];
T = 12.85 [GSC 2040-0650]; U = 13.38 [GSC 2040-0101].