I did have it logged and I can paste it here, but those always seem so damned long and outside of Apple Techs I have yet to run across anyone who can interpret the damned things.
That said, here's a partial Panic report; I've excluded the stuff at the bottom which seems to be more of a system overview and not specifically related to the panic.
Anonymous UUID: 3909CB2D-C449-7C64-4870-8A0E4FD30471
Tue Jun 16 18:41:19 2015
*** Panic Report ***
panic(cpu 0 caller 0xffffff7f88b07bdb): "GPU Panic: [<None>] 3 3 5f 1d 0 8 0 3 : NVRM[0/1:0:0]: Read Error 0x00070000: CFG 0x0fe910de 0x00100406 0xc0000000, BAR0 0x101000000 0xffffff81f8299000 0x0e7290a2, D0, P2/4\n"@/SourceCache/AppleGraphicsControl/AppleGraphicsControl-3.10.22/src/Appl eMuxControl/kext/GPUPanic.cpp:127
Backtrace (CPU 0), Frame : Return Address
0xffffff81c5e5bba0 : 0xffffff800612bda1
0xffffff81c5e5bc20 : 0xffffff7f88b07bdb
0xffffff81c5e5bd00 : 0xffffff7f86caee38
0xffffff81c5e5bdc0 : 0xffffff7f86d792c6
0xffffff81c5e5be00 : 0xffffff7f86faeacc
0xffffff81c5e5be20 : 0xffffff7f86cb580e
0xffffff81c5e5bec0 : 0xffffff7f86c648c0
0xffffff81c5e5bee0 : 0xffffff80066d95d5
0xffffff81c5e5bf10 : 0xffffff7f8693f74d
0xffffff81c5e5bf50 : 0xffffff7f88c30bf4
0xffffff81c5e5bf60 : 0xffffff7f88c38cfb
0xffffff81c5e5bf80 : 0xffffff800621708b
0xffffff81c5e5bfd0 : 0xffffff8006234d39
0xffffff81f1af3f40 : 0xffffff8006142e6b
0xffffff81f1af3f90 : 0xffffff80061433b0
0xffffff81f1af3fb0 : 0xffffff80062125b7
Kernel Extensions in backtrace:
com.apple.iokit.IOPCIFamily(2.9)[52E715FC-521D-3869-B2EA-5228FA4BEA34]@0xffffff 7f86924000->0xffffff7f86952fff
com.apple.driver.AppleACPIPlatform(3.1)[97299A71-6EDD-3AD9-AE1D-2F7B61E8AA72]@0 xffffff7f88c2a000->0xffffff7f88c88fff
dependency: com.apple.iokit.IOACPIFamily(1.4)[70E2B65E-A91A-3522-A1A0-79FD63EABB4C]@0xfffff f7f87619000
dependency: com.apple.iokit.IOPCIFamily(2.9)[52E715FC-521D-3869-B2EA-5228FA4BEA34]@0xffffff 7f86924000
com.apple.driver.AppleMuxControl(3.10.22)[26F693CB-BFE8-33FA-9D1F-3F66FC016768] @0xffffff7f88af9000->0xffffff7f88b0cfff
dependency: com.apple.driver.AppleGraphicsControl(3.10.22)[61967104-88AF-3605-82F5-A480A280 0A78]@0xffffff7f88af1000
dependency: com.apple.iokit.IOACPIFamily(1.4)[70E2B65E-A91A-3522-A1A0-79FD63EABB4C]@0xfffff f7f87619000
dependency: com.apple.iokit.IOPCIFamily(2.9)[52E715FC-521D-3869-B2EA-5228FA4BEA34]@0xffffff 7f86924000
dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[82EAD591-67E3-39CB-A232-A8095CA30E92]@0 xffffff7f869fe000
dependency: com.apple.driver.AppleBacklightExpert(1.1.0)[65E3187E-949B-36E9-BA33-1B13ABB058 1A]@0xffffff7f88af4000
com.apple.nvidia.driver.NVDAResman(10.0.2)[887AA320-9757-3030-996B-2DA348C9F19A ]@0xffffff7f86c5e000->0xffffff7f86ed3fff
dependency: com.apple.iokit.IOPCIFamily(2.9)[52E715FC-521D-3869-B2EA-5228FA4BEA34]@0xffffff 7f86924000
dependency: com.apple.iokit.IONDRVSupport(2.4.1)[C0B8A85D-B32A-3F24-B4FC-B62B3BBF9E57]@0xff ffff7f86c48000
dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[82EAD591-67E3-39CB-A232-A8095CA30E92]@0 xffffff7f869fe000
dependency: com.apple.AppleGraphicsDeviceControl(3.10.22)[44D7223C-9628-3FEA-A3B8-27DE9E1CE 0C3]@0xffffff7f86c58000
com.apple.nvidia.driver.NVDAGK100Hal(10.0.2)[DC43029D-568A-3B7C-976B-E922C17F51 43]@0xffffff7f86edf000->0xffffff7f8708cfff
dependency: com.apple.nvidia.driver.NVDAResman(10.0.2)[887AA320-9757-3030-996B-2DA348C9F19A ]@0xffffff7f86c5e000
dependency: com.apple.iokit.IOPCIFamily(2.9)[52E715FC-521D-3869-B2EA-5228FA4BEA34]@0xffffff 7f86924000
BSD process name corresponding to current thread: kernel_task