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').
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"11102 results found.
- Fermi GBM trigger 150806450 is not a GRB
- Fermi GBM trigger 150805556 is not a GRB
- Fermi GBM triggers 150730606 150731173 and 150801590 are not due to GRBs
- Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
- GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
- GRB 150724B: Swift-XRT afterglow detection
- GRB 150727A: Fermi GBM detection
- GRB 150724B: Continued RATIR Optical Observations
- GRB 150724B: MASTER upper limit
- GRB 150724B: Swift/UVOT Detection
- Konus-Wind observation of GRB 150724B
- GRB 150724B: Swift-XRT observations
- GRB 150724B: Swift ToO observations
- GRB 150724B: Fermi GBM detection
- GRB 150724B: Fermi-LAT detection
- Fermi GBM trigger 150725291 is not a GRB
- GRB 150721A: Fermi GBM detection
- Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
- Fermi Gamma-ray Burst Monitor triggers that are not GRBs
- Fermi GBM trigger 458312518/150711543 is not a GRB
- GRB 150711A: Fermi GBM detection
- MASTER OT Detection during Fermi Trigger 458235025 inspection
- Fermi Gamma-ray Burst Monitor Trigger bn150705731 is not a GRB
- Konus-Wind observation of GRB 150702A
- GRB 150702A: Fermi GBM detection
- IPN Triangulation of GRB 150702A
- GRB 150702A: MASTER-SAAO inspection
- GRB 150702A: Swift-XRT observations
- GRB 150702A: Swift ToO observations
- GRB 150702A: Fermi-LAT detection
- Fermi GBM Observations is no longer triggerin on V404 Cyg
- 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
- Konus-Wind observation of GRB 150627A
- V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
- GRB 150627A: Swift/UVOT Detection
- GRB 150627A: Swift-XRT afterglow detection
- GRB 150627A: Fermi GBM observation
- GRB 150627A: Swift ToO observations
- GRB 150627A: Fermi-LAT detection
- Fermi Gamma-ray Burst Monitor triggers that are not GRBs
- Fermi Gamma-ray Burst Monitor triggers bn150622899 and bn150623043 are not GRBs
- V404 Cyg: Fermi GBM observations
- V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
- Konus-Wind observation of Galactic transient V404 Cyg in outburst
- Fermi GBM trigger 150616734 is not a GRB
- Fermi GBM trigger 150616594 is not a GRB
- Fermi Gamma-ray Burst Monitor triggers bn150615791 and bn150615798 are not GRBs
- Fermi GBM trigger 150615574 is not a GRB
- Fermi GBM trigger 150613619 is not a GRB
- Fermi GBM trigger 150612648 is not a GRB
- Fermi Gamma-ray Burst Monitor trigger 455474712 / 150608698 is not a GRB
- Konus-Wind observation of GRB 150607A
- GRB 150607A: Fermi GBM Detection
- Konus-Wind observation of GRB 150530A
- GRB 150530A: Fermi GBM observation
- Fermi GBM trigger 150529948 is not a GRB
- Konus-Wind observation of GRB 150527A
- GRB 150527A: Fermi GBM observation
- GRB 150523A: Suzaku WAM observation of the prompt emission
- GRB 150523A: Swift ToO observations
- GRB 150513A: request for X-ray follow up
- Konus-Wind observation of GRB 150523A
- GRB 150523A: LCOGT Cerro-Tololo optical afterglow candidate
- GRB 150523A Swift-XRT afterglow detection
- GRB 150523B: Swift ToO observations
- GRB 150523A: Fermi-LAT detection
- GRB 150523A: Fermi GBM detection
- GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
- Konus-Wind observation of GRB 150514A
- GRB 150514A: GROND Bright Afterglow Confirmation
- GRB 150514A: Fermi GBM Detection
- GRB 150514A: Swift-XRT afterglow detection
- GRB 150514A: Swift ToO observations
- GRB 150514A: Fermi-LAT detection
- GRB 150512A: CrAO optical observations
- GRB 150513A: Fermi GBM detection
- GRB 150513A: Fermi-LAT detection
- GRB 150512A: Fermi GBM detection
- GRB 150512A: iPTF Optical Observations
- Konus-Wind observation of GRB 150510A
- GRB 150510A: Fermi GBM detection
- GRB 150510A: Fermi-LAT Refined Analysis
- GRB 150510A: Fermi-LAT detection
- Konus-Wind observation of GRB 150430A
- GRB 150430A: Fermi GBM Detection
- GRB 150426A: Fermi GBM detection
- Fermi GBM trigger 150424722 is not a GRB
- GRB 150424B: Fermi GBM detection
- GRB 150422A: Fermi GBM detection
- GRB 150416A: Fermi GBM detection
- GRB 150416A: Fermi-LAT detection
- Konus-Wind observation of a bright burst from SGR 1935+2154
- GRB 150404A: Fermi GBM detection
- Konus-Wind observation of GRB 150403A
- Fermi trigger 449861706: MASTER-SAAO possible candidate to OT of Short GRB
- GRB 150403A: Fermi GBM Detection
- GRB 150403A: Fermi-LAT detection
- Konus-Wind observation of GRB 150330A