GCN Circulars
GCN Circulars are rapid bulletins submitted by and distributed to the community. 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').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"39368 results found.
- GRB 230826A: Mondy optical observations
- Swift J1727.8-1613 (GRB 230824A): GAD Observatory La Spezia - optical observations
- GRB 230826A: Swift detection of a burst
- GRB 230826A: Fermi GBM Final Real-time Localization
- Swift GRB230826.81: Global MASTER-Net observations report
- Swift J1727.8-1613 (GRB 230824A): Bassano Bresciano Observatory optical observations
- GRB 230824A: AKO Photometric Follow-up Observations
- GRB 230818B: CALET Gamma-Ray Burst Monitor detection
- LIGO/Virgo/KAGRA S230825k: Upper limits from Swift/BAT-GUANO
- Swift GRB230825.85: Global MASTER-Net observations report
- Trigger 1187225: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
- Swift J1727.8-1613 (GRB 230824A): Skynet Optical Observations
- Trigger 1187207: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
- Trigger 1187203: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
- Swift GRB230825.75: Global MASTER-Net observations report
- GRB 230812B: radio detection with the VLA
- Fermi Gamma-ray Burst Monitor trigger 714618399/230825046 is not a GRB
- NICER detection of Swift J1727.8-1613 (GRB 230824A)
- Trigger 1187142: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
- Fermi trigger No 714618399: Global MASTER-Net observations report
- MAXI/GSC detection of Swift J1727.8-1613 (GRB 230824A)
- GRB 230824A: AKO Optical Afterglow Candidate
- Trigger 1186982: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
- IBAS trigger 10375 is not a GRB
- GRB 230824A is likely a Galactic Transient: Swift J1727.8-1613
- Integral GRB230824.72: Global MASTER-Net observations report
- GRB 230824B: AstroSat CZTI detection
- GRB 230824A: Swift detection of a burst
- Swift GRB230824.58: Global MASTER-Net observations report
- Swift GRB230824.10: Global MASTER-Net observations report
- Swift Trigger 1186908 is not a GRB
- GRB 230822A: Fermi GBM Observation
- LIGO/Virgo/KAGRA S230822bm: Upper limits from Swift/BAT-GUANO
- GRB 230822A: Swift/BAT-GUANO detection of a burst
- GRB 230812B: AstroSat LAXPC detection
- GRB 230818B: VZLUSAT-2 detection
- GRB 230818B: AstroSat CZTI detection
- GRID detection of GRB 230818A
- GRB 230822A: Fermi GBM Final Real-time Localization
- GRB 230812B: Assy optical observations, possible SN rise
- GRB 230815A: ATCA detection of radio counterpart
- Swift GRB230821.64: Global MASTER-Net observations report
- GRB 230812B: SAO RAS RC-500 and Zeiss-1000 observations
- GRB 230818A: Swift-BAT refined analysis
- GRB 20230818A: GIT optical upper limit
- Swift Trigger 1186391 is not a GRB
- Swift Trigger 1186390 is not a GRB
- Konus-Wind detection of GRB 230818A
- Swift Trigger 1186386 is not a GRB
- GRB 230812B : GRANDMA/Kilonova-Catcher optical afterglow detection and upper limits
- Swift GRB230820.81: Global MASTER-Net observations report
- Swift GRB230820.80: Global MASTER-Net observations report
- GRB 230820A: AstroSat CZTI detection
- Swift GRB230820.82: Global MASTER-Net observations report
- GRB 230818A: Fermi GBM Observation
- GRB 230812B: GIT Confirmation of SN rise
- GRB 230818A: Nickel and KAIT telescope optical observations
- GRB 230818A: SAO RAS 6-m telescope spectroscopy
- GRB 230812B: SAO RAS Zeiss-1000 observations
- GRB 230818A: further SAO RAS Zeiss-1000 observations
- GRB 230818A: AKO Upper Limit
- GRB 230818A: AstroSat CZTI detection
- GRB 230818A: Tautenburg observations
- GRB 230818A: Leavitt Observatory upper limit
- GRB 230818A: Swift-XRT refined Analysis
- GRB 230818A: Bassano Bresciano Observatory optical observations
- GRB 230818A: KGO RC-25 optical observations
- GRB 230818A: Swift/UVOT Detection
- GRB 230818A: NOT photometry and spectroscopy
- GRB 230818A: Enhanced Swift-XRT position
- GRB 230818A: SAO RAS Zeiss-1000 observations
- Fermi GRB 230818A: Global MASTER-Net observations report
- Fermi trigger No 713974668: Global MASTER-Net observations report
- GRB 230818A: GOTO optical afterglow detection
- GRB 230818A: Swift detection of a burst
- GRB 230818A: Fermi GBM Final Real-time Localization
- Swift GRB230818.98: Global MASTER-Net observations report
- Swift GRB230818.98: Global MASTER-Net OT detection
- GRB 230812B: SAO RAS observations, possible re-brightening
- GRB 230816A: Swift-BAT refined analysis
- GRB 230816A: SVOM/C-GFT optical detection
- GRB 230817A: AstroSat CZTI detection
- GRB 230812B: SAO RAS optical observations
- GRB 230816A: Swift-XRT refined Analysis
- GRB 230816A: Osservatorio Astronomico "Nastro Verde" optical observations
- GRB 230812B: NOEMA detection
- GRB 230815A: VLT/HAWK-I near-infrared afterglow detection
- Fermi GRB 230817A: Global MASTER-Net observations report
- GRB 230817A: BALROG localization (Fermi Trigger 713966581 / GRB 230817502)
- GRB 230817A: Fermi GBM Final Real-time Localization
- GRB 230812B: optical photometry from Konkoly
- GRB 230816A: Enhanced Swift-XRT position
- GRB 230812B: SAO RAS optical observations
- GRB230816A: Possible host and GIT detection of optical counterpart
- GRB 230816A: Tautenburg observations
- GRB 230816A: AKO Optical Observations
- GRB 230816A: TShAO and Assy optical observations
- GRB 230816A: SAO RAS optical observations
- Swift GRB230816.80: Global MASTER-Net observations report
- IPN triangulation of GRB 230815B