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').
50 results found.
- Fermi trigger No 736197684: Global MASTER-Net observations report
- GRB 240403A: Fermi GBM Detection
- Swift GRB240305.18: Global MASTER-Net observations report
- Swift GRB240305.16: Global MASTER-Net observations report
- Swift GRB 240303A: Global MASTER-Net observations report
- GRB 240124B: AstroSat CZTI detection
- Swift GRB231230.06: Global MASTER-Net observations report
- Swift GRB231214.85: Global MASTER-Net observations report
- IPN triangulation of GRB 231129C
- GRB 231123C (short): Glowbug gamma-ray detection
- GRB 230304D: AstroSat CZTI detection
- Fermi trigger No 683537972: Global MASTER-Net observations report
- Fermi trigger No 676537486: Global MASTER-Net observations report
- GRB 220101A: Swift-XRT refined Analysis
- GRB 210424B: AstroSat CZTI detection
- Fermi GRB 201121A: Global MASTER-Net observations report
- Swift GRB 201029A: Global MASTER-Net observations report
- Fermi GRB 200629A: Global MASTER-Net observations report
- LIGO/Virgo S200224ca: Updated Sky Localization and EM Bright Classification
- LIGO/Virgo S200128d: Global MASTER-Net observations report
- Swift GRB200109.07: Global MASTER-Net observations report
- Fermi trigger No 598543714: Global MASTER-Net observations report
- Konus-Wind observation of GRB 191218A
- GRB 190823A: MAXI/GSC detection
- LIGO/Virgo S190512at: Updated sky localization
- GRB 180510A: Swift/UVOT followup observations
- GRB 180404B: Swift/UVOT Detection
- BAT trigger 778435 is not a GRB.
- LIGO/Virgo G297595: Las Cumbres Observatory Optical Follow-Up
- GRB 170803A: Swift/UVOT Detection
- GRB 160821B: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB 150902A
- GRB 150821A: Fermi GBM detection
- Trigger 643078: Swift detection of H1743-322
- GRB 140129B: Swift-XRT refined Analysis
- GRB 140102A: Swift/UVOT Detection
- GRB 120215A: Swift/UVOT Upper Limits
- GRB 111222A: Swift-XRT observations
- GRB 100621A: Swift XRT refined analysis
- GRB 090807: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB 071020
- GRB 070419A: Early Super-LOTIS Observations
- GRB061222A Swift/UVOT: Upper Limits
- GRB050712: Swift UVOT Observation of Afterglow Emission
- 030331 NOT A GRB
- GRB 030329: visual observations
- SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
- GRB 020322 optical observations
- GRB000201 Optical Observations
- VLT spectrum of GRB990510