Artemis II is at the Moon. Here's what else is watching from space.
On April 6, 2026, four astronauts flew around the Moon and set a new record for the farthest humans have ever traveled from Earth — 252,756 miles, breaking a mark held by the Apollo 13 crew since 1970. Reid Wiseman, Victor Glover, Christina Koch and Jeremy Hansen saw Earthrise from a vantage point no human had experienced in over half a century.
It was, by any measure, a historic moment.
But while the world watched Orion arc around the lunar far side, something else was happening in that same patch of sky. Fermi's Gamma-ray Burst Monitor was scanning the cosmos at 10 gamma-ray bursts per day. The Einstein Probe was sweeping the X-ray sky every few hours. SVOM's ECLAIRs telescope was watching for the next transient. IceCube was catching neutrinos under the South Pole ice. And Starithm was ingesting all of it, in real time.
The Instruments That Never Stop
The telescopes that Starithm tracks don't take breaks for milestones. Fermi GBM has been detecting gamma-ray bursts continuously since 2008 — roughly 240 per year, or one every 36 hours. During the six days Artemis II has been in flight, Fermi has likely detected a dozen GRBs, any one of which could be a cosmological explosion billions of light-years away.
Swift, the multi-wavelength observatory that has revolutionised GRB follow-up since 2004, was almost certainly pivoting its X-ray Telescope toward afterglows while the Artemis crew was performing systems checks in Orion. SVOM — the French-Chinese mission that launched in 2024 — was simultaneously covering the Southern sky that ECLAIRs can see. Einstein Probe was sweeping through its wide-field X-ray view, watching for the next soft X-ray transient.
None of these instruments care about what humans are doing 250,000 miles away. They are optimised for one thing: catching the universe being violent.
What Happens When a GRB Fires Near the Moon
This isn't hypothetical. GCN circulars — the real-time astronomer reports that Starithm ingests — have been flowing during the entire Artemis II mission. Observers using iTelescope.Net have been submitting optical follow-up reports. The global astronomy community hasn't paused.
And that's the deeper point. The kind of multi-messenger astronomy Starithm is built around — where a single event triggers alerts from Fermi, follow-up from EP, confirmation via GCN circulars, and cross-matching across instruments — is happening constantly, in the background, regardless of what else is going on.
Artemis II is extraordinary. But the universe was producing extraordinary events long before we got back to the Moon.
Why Artemis II Matters — Beyond the Headlines
It's worth stepping back from the astronomy for a moment, because Artemis II is important in ways that have nothing to do with instruments or data pipelines.
This is the first time humans have traveled beyond low Earth orbit since Apollo 17 in December 1972. That's 54 years. An entire generation of scientists, engineers and astronauts has built careers without any human ever leaving the Earth-Moon neighbourhood. Artemis II changes that — and it does so with a crew that reflects how much has changed: Christina Koch is the first woman to fly a lunar mission, and Jeremy Hansen is the first non-American to do so.
But the mission's deeper significance is what it tests. Artemis II is not a landing — it's a dress rehearsal. The Orion spacecraft, the Space Launch System, the life support systems, the communication infrastructure, and the crew procedures are all being validated for the first time in deep space. Every system that works on this mission is a system that Artemis III — the actual Moon landing — will depend on.
The stakes are real. Orion has to handle radiation exposure beyond the Van Allen belts, thermal extremes that swing hundreds of degrees, and the communications delays and blackouts that come with being a quarter million miles from Earth. The crew has to function — physically and mentally — in an environment that humans have barely visited and never stayed in for long.
If Artemis II succeeds fully, it means humans will walk on the Moon again in the next few years. And after that, the ambition is Mars. The path from a lunar flyby to a Mars landing is long, but it starts here.
That's worth pausing for, even in the middle of a GRB monitoring pipeline.
The Coincidence Worth Noting
On April 6, as Artemis II completed its lunar flyby, Starithm's real-time pipeline was processing GCN notices from multiple instruments. Some of those events will have circulars written about them. Some will be matched across instruments. A few will end up in the scientific literature.
None of that is diminished by the fact that humans were simultaneously floating in a spacecraft watching the Earth rise over the lunar horizon. If anything, it's a reminder of how broad the sky is — and how much is happening in it at any given moment.
Starithm is watching. Even when you're at the Moon.
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Starithm tracks real-time alerts from Fermi GBM, Einstein Probe, SVOM, Swift, IceCube, CHIME and LVK. Explore live events at starithm.ai.