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<p>Dear Everyone, </p>
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<p>This week we will have a seminar by <span>Milena Crnogorčević. We meed at 13:15 on May 7th.</span></p>
<p><span>Importantly, we will meet in FC61 and not our normal room. FC61 is in the astro department on the 6th floor.</span></p>
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<div><b>Do We See Superluminous Supernovae in Gamma Rays?</b><br>
I’ll present our new paper (with Tim Linden, Ariel Goobar, and Brian Metzger) searching for GeV emission from the largest sample of SLSNe to date. Using 17 years of Fermi-LAT data and physically motivated transparency windows, we find no population-level detections
and place strong constraints on gamma-ray efficiency—well below standard model predictions. However, one source (SN 2017egm) shows a suggestive excess that is well described by a magnetar model, hinting that gamma-ray-bright SLSNe may exist but are rare or
diverse.</div>
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<p>Best,<br>
Haakon (on behalf of the organisers)</p>
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