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"27129 results found.
- Trigger 649143: Swift detection of AX J1619.4-4945
- Trigger 649113: Swift detection of SGR 1E 1841-045
- Fermi Gamma-ray Burst Monitor triggers that are not GRBs
- Fermi GBM trigger 458312518/150711543 is not a GRB
- GRB 150711A: Swift-BAT refined analysis
- GRB 150711A: Swift/UVOT Upper Limits
- GRB 150711A: Swift-XRT refined Analysis
- GRB 150711A: Fermi GBM detection
- GRB 150711A: Observations from the 2.5m NOT
- GRB 150711A: Swift detection of a burst
- GRB 150710A: Swift/UVOT Upper Limits
- MASTER OT Detection during Fermi Trigger 458235025 inspection
- Swift-XRT observations of GRB 150710A
- Confirmation that Swift trigger 648422 is not an astrophysical source
- Konus-Wind observation of GRB 150710A (Swift trigger 648437)
- GRB 150710A: Swift-BAT refined analysis
- GRB 150710A: RATIR Observations
- Swift trigger 648437: A GRB or a burst from 1RXS J125754.7+141850
- Swift Trigger 648422: Swift-XRT observations
- Trigger 648422: Swift possible detection of a source in NGC4552
- Fermi Gamma-ray Burst Monitor Trigger bn150705731 is not a GRB
- GRB 150702A: Fermi GBM detection
- IPN Triangulation of GRB 150702A
- GRB 150702A: MASTER-SAAO inspection
- GRB 150702A: Fermi-LAT detection
- Fermi GBM Observations is no longer triggerin on V404 Cyg
- Swift Trigger 647642 is probably not an astrophysical source
- Fermi Gamma-ray Burst Monitor Trigger 150626873 is not a GRB
- Fermi Gamma-ray Burst Monitor Trigger bn150628857 is not a GRB
- Fermi Gamma-ray Burst Monitor trigger bn150629779 is not a GRB
- GRB 150626B, Swift-BAT refined analysis
- V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
- GRB 150627A: corection to 17978
- GRB 150627A: MASTER-SAAO OT Detection
- GRB 150627A: Swift/UVOT Detection
- GRB 150627A: Fermi GBM observation
- GRB 150626B: Swift-XRT refined Analysis
- GRB 150626A: Swift-BAT refined analysis
- GRB 150627A: Fermi-LAT detection
- GRB 150626B: Swift/UVOT Upper Limits
- GRB 150626B: MASTER observations
- GRB 150626B: Swift detection of a burst
- GRB 150626A: Swift-XRT refined Analysis
- GRB 150626A: Swift/UVOT Upper Limits
- Trigger 646721: Swift detection of V 404 Cyg
- GRB 150626A: Swift detection of a burst
- Swift Trigger 646423 is GS 1354-645
- Trigger 645944: Swift detection of H1745-203
- Fermi Gamma-ray Burst Monitor triggers that are not GRBs
- V404 Cyg: MASTER Swift, Integral alert observations
- Fermi Gamma-ray Burst Monitor triggers bn150622899 and bn150623043 are not GRBs
- Swift Trigger 645340 was Sco X-1
- Swift Trigger 645340: a possible GRB
- Trigger 645176: Swift detection of V404 Cyg
- V404 Cyg: Fermi GBM observations
- GRB 150616A: Watcher optical upper limit
- Swift triggers again on V404 Cyg
- Swift Trigger 644596 is V404 Cyg
- Swift Trigger 644520 is V404 Cyg
- IBAS trigger 7015 is not a GRB
- GRB 150616A: Swift/UVOT Upper Limits
- GRB 150616A: Swift-BAT refined analysis
- V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
- GRB 150616A: Swift-XRT refined Analysis
- Konus-Wind observation of Galactic transient V404 Cyg in outburst
- GRB 150616A: Swift detection of a burst
- Fermi GBM trigger 150616734 is not a GRB
- Fermi GBM trigger 150616594 is not a GRB
- V404 Cyg: Swift/UVOT Detection
- Fermi Gamma-ray Burst Monitor triggers bn150615791 and bn150615798 are not GRBs
- Optical follow-up of Swift trigger on V404 Cyg
- GRB 150615A, Swift-BAT refined analysis
- Swift trigger 643949 is V404 Cyg
- GRB 150615A: Swift-XRT refined Analysis
- Fermi GBM trigger 150615574 is not a GRB
- GRB 150615A: Swift/UVOT Detection
- GRB 150615A: Swift detection of a burst
- Fermi GBM trigger 150613619 is not a GRB
- Fermi GBM trigger 150612648 is not a GRB
- Trigger 643078: Swift detection of H1743-322
- Konus-Wind observation of GRB 150608A
- Fermi Gamma-ray Burst Monitor trigger 455474712 / 150608698 is not a GRB
- GRB150607A: AAO and CrAO optical observations
- GRB150607A: Discovery Channel Telescope Optical Observations
- Konus-Wind observation of GRB 150607A
- GRB 150607A: Swift-XRT refined Analysis
- GRB 150607A: Swift/UVOT Detection
- GRB 150607A: NOT optical observations
- GRB 150607A: Swift-BAT refined analysis
- GRB 150607A: Fermi GBM Detection
- GRB 150607A: Swift detection of a burst with an optical counterpart
- Swift trigger 642453 is not an astrophysical source
- Swift Trigger 642453: a possible GRB
- Konus-Wind observation of GRB 150530A
- GRB 150527A: Continued RATIR Observations
- Swift Triggers 642296 and 642297 are not GRBs
- GRB 150530A: RATIR Optical Observations
- GRB 150530A: Swift-XRT refined Analysis
- GRB 150530A: Swift/UVOT Upper Limits
- GRB 150530A: Fermi GBM observation