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').
57 results found.
- LIGO/Virgo/KAGRA S240422ed: Zwicky Transient Facility contuinued observations of S240422ed and candidate analysis
- Swift GRB240123.46: Global MASTER-Net observations report
- GRB 230808A: Fermi GBM Detection
- GRB 230803A: AstroSat CZTI detection
- Fermi GRB 230723A: Global MASTER-Net observations report
- Fermi GRB 220211B: Global MASTER-Net observations report
- Fermi GRB 210621A: Global MASTER-Net observations report
- Fermi trigger No 645047470: Global MASTER-Net observations report
- Swift GRB 210610B: Global MASTER-Net observations report
- Fermi GRB 210503A: Global MASTER-Net observations report
- IceCube-201021A: No neutrino counterpart candidates in ANTARES search
- IceCube-201014A: No neutrino counterpart candidates in ANTARES search
- IceCube-200916A: No neutrino counterpart candidates in ANTARES search
- HAWC-200907A: No Neutrino Counterpart detected with ANTARES
- Fermi GRB 200605A: Global MASTER-Net observations report
- GRB 200524A: AstroSat CZTI detection
- Fermi trigger No 601841483: Global MASTER-Net observations report
- GRB 200125A: Swift-BAT refined analysis
- Swift GRB191226.02: Global MASTER-Net observations report
- GRB 191031D: AGILE/MCAL observations
- Swift GRB190718.2 Global MASTER-Net observations report
- Fermi trigger No 581645543 Global MASTER-Net observations report
- LIGO/Virgo S190426c: Discovery Channel Telescope Follow-Up of ZTF19aassfws
- LIGO/Virgo S190412m: Palomar Gattini-IR Wide-field Infrared Follow-up
- GRB 181023A: Swift/UVOT Upper Limits
- GRB 180614A: Swift/UVOT Upper Limits
- GRB 180311A: Swift/UVOT Upper Limits
- GRB 170711A: Swift/UVOT Upper Limits
- GRB 160425A: Swift/UVOT Detection
- GRB 160313A: Swift/UVOT Upper Limits
- LIGO/Virgo G211117: Identification of a GW CBC Candidate
- GRB 151031A: Swift/UVOT Detection
- GRB 151022A: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB 150403A
- Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
- Swift trigger 601928 is V490 Cep: BAT+XRT refined analysis.
- Konus-Wind observation of GRB 140508A
- GRB 140103A: MASTER-Net early OT detection
- GRB 131229A: Swift-BAT refined analysis
- GRB 130929A: Swift/UVOT Upper Limits
- GRB 130615A: Swift/UVOT Upper Limits
- GRB130427A: Swift/UVOT followup observations of an Optical Afterglow
- GRB 120728A: Swift/UVOT Upper Limits
- Swift detection of Ginga 0834-430
- Konus-Wind observation of GRB 120328B
- GRB 111123A: Swift/UVOT Upper Limits
- GRB 110402A: Swift/UVOT detection of afterglow candidate
- GRB 100413A: Swift-XRT Refined Analysis
- GRB 080723A: Swift/UVOT Upper Limits
- Swift/UVOT observations of GRB080409
- GRB 071112C: Optical and NIR data observed with KANATA
- GRB 050730: XRT refined analysis
- GRB050712: Swift UVOT Observation of Afterglow Emission
- GRB041223: Swift XRT Detection of X-ray Afterglow Emission
- IPN BURST POSITION
- GRB 991105: BATSE Observations
- BeppoSAX NFI observations of GRB 980703