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"11556 results found.
- GRB 151021B: Fermi GBM detection
- Fermi GBM trigger 466602792/151015495 is not a GRB
- Fermi GBM trigger 466316973/151012187 is not a GRB
- Fermi GBM trigger 466059859/151009211 is not a GRB
- Konus-Wind observation of GRB 151006A
- GRB 151006A: Fermi-LAT detection
- GRB 151006A: Fermi GBM detection
- GRB 151001A: Fermi GBM detection
- Konus-Wind observation of GRB 150922A
- GRB 150922A: Fermi GBM observation
- IPN Triangulation of GRB 150922A (short/hard)
- LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
- ANTARES neutrino detection: Fermi GBM Observations
- Fermi GBM trigger bn150920977 is not due to a GRB
- LIGO/Virgo G184098: DESGW followup program
- LIGO/Virgo G184098: DESGW followup program
- LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
- Fermi GBM trigger 463890496/150914103 is not a GRB
- GRB 150912A: Fermi GBM observation
- Fermi GBM trigger 463422723/150908689 is not a GRB
- Fermi GBM trigger 463339482/150907725 is too weak to be classified
- Fermi GBM trigger 150907763 is not a GRB
- GRB 150906A: Fermi GBM detection
- GRB 150902A: Swift-XRT afterglow detection
- GRB 150902A: Swift-XRT observations
- GRB 150902A: MASTER-SAAO optical observations
- Konus-Wind observation of GRB 150902A
- GRB 150902A: Swift ToO observations
- GRB 150902A: Fermi GBM detection
- GRB 150902A: Fermi-LAT detection
- GRB 150831B: MASTER-IAC early optical observations
- GRB 150831B: Fermi GBM detection
- Fermi GBM trigger 150829183 is not a GRB
- Fermi GBM trigger 150828520 is not a GRB
- Fermi GBM trigger 150827524 is not a GRB
- Fermi GBM trigger 150826536 is not a GRB
- Konus-Wind observation of GRB 150824A
- IPN Triangulation of GRB 150824A
- GRB 150824A: Fermi GBM detection
- Konus-Wind observation of GRB 150821A
- GRB 150821A: Fermi GBM detection
- Konus-Wind observation of GRB 150819B
- GRB 150819B: Fermi GBM detection
- IPN Triangulation of GRB 150819B (short / very intense)
- MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
- GRB 150817A: Fermi GBM observation
- Fermi GBM Trigger 150815694 is not a GRB
- GBM Trigger 150813665 is not a GRB
- Konus-Wind observation of GRB 150811B
- IPN Triangulation of GRB 150811B
- GRB 150811B: Fermi GBM detection
- GRB 150810A: Fermi GBM detection
- Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
- Fermi GBM trigger 150807969 is not a GRB
- 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