Parallel cuts in tyre
Discussion
As Mr Will says, that can only be a lock-up under braking. Were your pressures OK before you got the flat? I only ask because the lateral spread of the 'cuts' seems quite wide, suggesting that you were riding with too little air in the tube (IMHO)
Also, have you checked the tube in water. There is a high probability that there is a tiny perforation of the tube, somewhere around its circumference that will hold air immediately upon inflation, but let it seep out over time. The only other cause is really going to be valve failure.
I may be wrong, but I think I can see a potential cause at the bottom of the 'cuts' in your photo, OP. This can be where the tyre, whilst 'locked-up', drags debris ahead of it from the road surface, then when you release the brake the tyre rolls over the little pile of debris that you've collected, causing either an immediate failure, or a weakness in the tube wall which pneumatic pressure later exploits, hence you only discovering the flat when you check your bike over later.
The tyre isn't "dead" yet, but you should probably keep an eye on it. Did you check the inside of the tyre with your thumbs? I accept that it may seem like I'm trying to teach the sucking of eggs, but you can't always SEE the cause of a puncture, but if you turn the tyre almost inside out and, using some pressure, work your thumbs around the inside, you may find the cause of your puncture.
The tip of a thorn can be a popular one, just the very tip, and it won't pop the tube upon inflation, because it's buried slightly off tread-centre within the tyre carcass and will only perforate the tube when you lean over for a corner and 'weight it up' in exactly theright wrong spot.
Check the tyre inside and out, and any small holes can be inspected with a tiny flat-blade screwdriver, which can then be used to dig out any potential nasties, and a drop of superglue used to 'fill' the hole to prevent further debris getting in.
Also, have you checked the tube in water. There is a high probability that there is a tiny perforation of the tube, somewhere around its circumference that will hold air immediately upon inflation, but let it seep out over time. The only other cause is really going to be valve failure.
I may be wrong, but I think I can see a potential cause at the bottom of the 'cuts' in your photo, OP. This can be where the tyre, whilst 'locked-up', drags debris ahead of it from the road surface, then when you release the brake the tyre rolls over the little pile of debris that you've collected, causing either an immediate failure, or a weakness in the tube wall which pneumatic pressure later exploits, hence you only discovering the flat when you check your bike over later.
The tyre isn't "dead" yet, but you should probably keep an eye on it. Did you check the inside of the tyre with your thumbs? I accept that it may seem like I'm trying to teach the sucking of eggs, but you can't always SEE the cause of a puncture, but if you turn the tyre almost inside out and, using some pressure, work your thumbs around the inside, you may find the cause of your puncture.
The tip of a thorn can be a popular one, just the very tip, and it won't pop the tube upon inflation, because it's buried slightly off tread-centre within the tyre carcass and will only perforate the tube when you lean over for a corner and 'weight it up' in exactly the
Check the tyre inside and out, and any small holes can be inspected with a tiny flat-blade screwdriver, which can then be used to dig out any potential nasties, and a drop of superglue used to 'fill' the hole to prevent further debris getting in.
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