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.
Lucene Examples (click to copy):
subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"
33 results found.
- GRB 221009A: Determination of the black holes mass and spin
- GRB 221009A: Peak luminosity of the supernova vs. synchrotron afterglow
- GRB 221009A X-ray light-curve and the indication of TeV light-curve
- GMRT radio detection of GRB 180720B
- GRB 180720B: CALET Gamma-Ray Burst Monitor detection
- NuSTAR observations of GRB 180720B
- GRB 180720B: OAJ optical observations
- GRB 180720B: AMI-LA 15.5 GHz observation
- GRB 180720B long follow up requested
- GRB 180720B: KAIT Optical Observations
- GRB 180720B: D50 optical observations
- GRB 180720B: MASTER Global Net OT observations
- GRB 180720B: REM photometry
- GRB 180720B: ISON-Castelgrande optical observations
- GRB 180720B: Testing the universality of the newly born neutron star in BdHNe
- GRB 180720B: COATLI Optical Detection
- Konus-Wind observation of GRB 180720B
- GRB 180720B: MITSuME Ishigaki optical observations
- GRB 180720B: Swift-BAT refined analysis
- GRB 180720B: VLT/X-shooter redshift
- GRB 180720B: MAXI/GSC detection
- GRB 180720B: LCO optical afterglow observations
- GCN 22984 was for GRB 180720B
- GRB 180720B: OSN detection, fading slower?
- GRB 180720B: Swift-XRT refined Analysis
- GRB 180720B: MITSuME Akeno optical observations
- GRB 180720B: Fermi GBM observation
- GRB 180720B : Fermi-LAT detection
- GRB 180720B : TSHAO optical observations
- GRB 180720B: Kanata 1.5m optical/NIR observation
- GRB 180720B: LCO Haleakala possible bright optical candidate
- Correction: Swift trigger #848890 is GRB 180720B (not GRB 180720A)
- GRB 180720B: Swift detection of a burst