So, the window is double paned tempered glass. As Fixer said in his post, the alarms will sound based on either movement or noise. So how do you get in without noise? A few thoughts:
1. Heat can melt the glass and potentially do so quietly. It is possible the glass would shatter, but also fairly likely it wouldn't. Shattering = alarms. I don't believe Fixer possesses a decent heat source.
2. It wouldnt' be hard to shatter the window and get in quickly - but the alarm would go off. This option requires a way to shut off the alarm before shattering the window or dealing with security once they arrive.
3. Covering the window with tape can help prevent shattering. But since we can only tape the outside of the window it is not guaranteed to be silent. A small nail hit sharply into a corner of the window will do. We would have to do this twice - once for each pane. We also would need to be careful not to tri the motion sensor on the interior window.
4. Try googling for other options - this is about as far as I got.
Please don't just read this without responding with something as we need an option. If nobody has a better idea I suspect we are stuck using tape. I'm guessing we might have some, although I'm not sure. On the other hand I doubt anyone has a flame thrower of sorts. Or do you?