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.
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"
3391 results found.
- Fermi trigger No 686403226: Global MASTER-Net observations report
- Fermi trigger No 686350260: Global MASTER-Net observations report
- Fermi-LAT gamma-ray observations of IceCube-220928A
- IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
- IceCube-220928A - IceCube observation of a high-energy neutrino candidate track-like event
- IPN triangulation of GRB 220927A (long)
- Fermi GRB 220925A: Global MASTER-Net observations report
- Fermi trigger No 685748699: Global MASTER-Net observations report
- LAT GRB220921.46: Global MASTER-Net observations report
- Fermi trigger No 685452089: Global MASTER-Net observations report
- Fermi trigger No 684716840: Global MASTER-Net observations report
- Fermi GRB 220912A: Global MASTER-Net observations report
- IPN triangulation of GRB 220905A
- IceCube Alert 220907.28: Global MASTER-Net observations report
- GRB 220905A: BALROG localization (Fermi Trigger 684070128 / GRB 220905478)
- GRB 220905A: Fermi GBM Final Real-time Localization
- Fermi trigger No 683646997: Global MASTER-Net observations report
- Fermi trigger No 683537972: Global MASTER-Net observations report
- Fermi trigger No 683202084: Global MASTER-Net observations report
- Fermi trigger No 683183601: Global MASTER-Net observations report
- GRB 220823A: Fermi GBM detection
- Fermi trigger No 682918137: Global MASTER-Net observations report
- GRB 220823A: Swift/BAT-GUANO detection of a short burst
- IceCube Alert 220822.85: Global MASTER-Net observations report
- Fermi GRB 220810A: Global MASTER-Net observations report
- Fermi trigger No 681212354: Global MASTER-Net observations report
- Fermi trigger No 680782656: Global MASTER-Net observations report
- Fermi GRB 220728A: Global MASTER-Net observations report
- AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220728A
- GRB 220728A: Fermi GBM Final Real-time Localization
- Fermi GRB 220724A: Global MASTER-Net observations report
- GRB 220715B: Fermi GBM detection
- GRB 220714B: Fermi GBM observation
- Fermi GRB 220711B: Global MASTER-Net observations report
- GRB 220711B: NOT optical observations
- GRB 220711B: Swift detection of a burst
- GRB 220711B: Fermi GBM Final Real-time Localization
- GRB 220708A: Swift detection of a burst
- GRB 220706A: Swift detection of a burst
- IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
- IceCube-220629A: No significant detection in HAWC
- IceCube-220627A: No significant detection in HAWC
- IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
- Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
- GRB 220627A: MeerLICHT candidate optical afterglow
- GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
- Fermi trigger No 678058621: Global MASTER-Net observations report
- Fermi GRB 220623B: Global MASTER-Net observations report
- Swift Detection of MAXI J0655-013
- Fermi trigger No 677377371: Global MASTER-Net observations report
- Fermi GRB 220620A: Global MASTER-Net observations report
- GRB 220617A: Swift-XRT observations
- IPN triangulation of GRB 220606C
- Fermi trigger No 676909037: Global MASTER-Net observations report
- Fermi trigger No 676537486: Global MASTER-Net observations report
- Fermi GRB 220608A: Global MASTER-Net observations report
- Konus-Wind detection of GRB 220601A
- GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
- GRB 220606B: Fermi GBM Final Real-time Localization
- Fermi trigger No 675992935: Global MASTER-Net observations report
- GRB 220527A: MITSuME Akeno continued optical observation
- GRB 220527A: Lick 3m Optical Observations
- GRB 220528A: Fermi GBM Observation
- Fermi GRB 220530A: Global MASTER-Net observations report
- GRB 220528A: Fermi GBM Final Localization
- GRB 220527A: REM optical/NIR observations
- GRB 220527A: VLT/X-shooter spectroscopic redshift
- Fermi trigger No 675411172: Global MASTER-Net observations report
- GRB 220527A: NOT optical photometry and spectroscopic redshift
- IPN triangulation of GRB 220522B
- GRB 220521A: ISON-Castelgrande observatory optical observations
- IPN triangulation of GRB 220519A
- Konus-Wind detection of GRB 220506A
- GRB 220514B: MAXI/GSC detection
- IceCube-220513A: No Candidate Counterparts from the Zwicky Transient Facility
- IceCube Alert 220513.97: Global MASTER-Net observations report
- Fermi GRB 220513A: Global MASTER-Net observations report
- GRB 220506A: MITSuME Akeno optical upper limits
- IceCube Alert 220509.76: Global MASTER-Net observations report
- GRB 220506A/MAXI J1558-266: MAXI/GSC detection
- IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
- GRB 220423A: Detection by VZLUSAT-2
- Fermi GRB 220426B: Global MASTER-Net observations report
- Fermi trigger No 672374264: Global MASTER-Net observations report
- Fermi trigger No 671729344: Global MASTER-Net observations report
- Konus-Wind detection of GRB 220412B
- GRB 220408B: Fermi GBM observation
- Konus-Wind detection of GRB 220408B
- GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
- GRB 220408B: Fermi-LAT detection
- GRB 220412B: MITSuME Akeno optical upper limits
- IPN triangulation of GRB 220408B
- Fermi GRB 220411A: Global MASTER-Net observations report
- GRB 220408B: AstroSat CZTI detection
- GRB 220408A: BOOTES-5/JGT optical afterglow detection
- Fermi GRB 220408B: Global MASTER-Net observations report
- GRB 220408B: Fermi GBM Final Localization
- IceCube Alert 220405.93: Global MASTER-Net observations report
- IceCube Alert 220405.21: Global MASTER-Net observations report
- GRB 220403B: Fermi GBM detection