GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
32 results found.
- GRB 241030B: Montarrenti Observatory optical upper limit
- GRB 240825A: Montarrenti Observatory optical follow-up observations
- GRB 240825A: Montarrenti Observatory optical observations
- SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
- EP240802a: Montarrenti Observatory optical upper limit
- EP240801a: GRANDMA and Kilonova-Catcher optical observations
- EP240626a: Montarrenti Observatory optical upper limit
- IceCube-240327B: GRANDMA/Kilonova-Catcher observations of 4FGL J0555.9+0030 and optical upper limits
- X-ray transient EP240315a: Montarrenti Observatory optical upper limit
- GRB240204A: VIRT optical upper limit
- GRB 240204A: Montarrenti Observatory optical observations
- Swift J1727.8-1613 (GRB 230824A): Montarrenti Observatory photometric observations
- GRB 230812B : GRANDMA/Kilonova-Catcher optical afterglow detection and upper limits
- GRB 230812B: Montarrenti Observatory optical observations
- GRB 230723B: Montarrenti Observatory upper limit
- ZTF23aaoohpy/AT2023lcr: Montarrenti Observatory optical observations
- GRB 230414B: Montarrenti Observatory late time optical afterglow detection
- GRB221120A: Montarrenti Observatory Upper Limit
- GRB 221009A: GRANDMA/Kilonova-Catcher observations
- GRB 210610B: University of Siena Observatory optical photometry of the afterglow
- GRB 210420B: Montarrenti Observatory follow-up observations
- GRB 210420B: Montarrenti Observatory optical afterglow detection
- GRB 210419C: Montarrenti Observatory Upper Limit
- GRB 210402A: BOOTES-network early optical upper limit
- GRB 210402A: Montarrenti Observatory upper limit
- GRB 190627A: Montarrenti Observatory optical detection
- GRB 140311A: Montarrenti Observatory optical upper limit
- GRB 130831A: Montarrenti Observatory optical follow-up
- GRB 130831A: Montarrenti Observatory optical observations
- GRB130606A: Montarrenti Observatory afterglow detection
- GRB 120311A: C88 optical limits
- GRB 120311B: C88 optical limits