Adds data analysis section

references.bib

@@ -205,3 +205,19 @@
   number={8},
   pages={2317-2326}
 }
+
+@article{PhysRevD.95.062003,
+  title = {Calibration of the Advanced LIGO detectors for the discovery of the binary black-hole merger GW150914},
+  author = {LIGO Scientific Collaboration},
+  journal = {Phys. Rev. D},
+  volume = {95},
+  issue = {6},
+  pages = {062003},
+  numpages = {16},
+  year = {2017},
+  month = {Mar},
+  publisher = {American Physical Society},
+  doi = {10.1103/PhysRevD.95.062003},
+  url = {https://link.aps.org/doi/10.1103/PhysRevD.95.062003}
+}
+