https://status.pagerduty.com/# has the ability to subscribe to events. We are currently using the RSS Feed to broadcast PagerDuty outages via Slack. Unfortunately these alerts can often come up to 20 minutes after the issues is announced.
It looks like you all are using the Atlassian Status Page to host this. They have released a new feature to allow your subscribers to subscribe via Slack. See: https://support.atlassian.com/statuspage/docs/enable-slack-subscriptions/
Unfortunately, it looks like your StatusPage admins need to enable this feature in order for us to use it.