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').
47 results found.
- GRB 230307A: JWST second-epoch observations
- GRB 230307A: iTelescope optical upper limit (likely)
- GRB 230307A: JWST NIRSpec observations, possible higher redshift
- GRB 230307A: further analysis of the Konus-Wind detection and rest-frame energetics
- GRB 230307A: good match with kilonova models
- GRB 230307A: short mininum variability timescale compatible with a merger origin
- GRB 230307A: JWST observations consistent with the presence of a kilonova
- GRB 230307A: Chandra late-time detection of the X-ray afterglow
- GRB 230307A: Bad Time Intervals for Fermi GBM data
- GRB 230307A: Continued Gemini-South observations confirm rapid optical fading
- GRB 230307A: Far off-axis NuSTAR detection of the GRB
- GRB 230307A: ATCA radio detection
- GRB 230307A: INTEGRAL upper limit on Hard X-ray afterglow
- GRB 230307A: Swift/UVOT detection
- GRB 230307A: soft X-ray detection with LEIA
- GRB 230307A: Swift-XRT afterglow detection
- Further improved IPN localization for GRB 230307A
- GRB 230307A: SOAR/Goodman detection of the possible host galaxy
- GRB 230307A: GECKO optical observations and detections of the afterglow
- GRB 230307A: MAXI/GSC upper limit
- GRB 230307A: Gemini-South Confirmation of the Optical Afterglow
- GRB 230307A: AGILE/MCAL analysis
- GRB 230307A: ATLAS information on the ULTRACAM optical afterglow candidate
- GRB 230307A: Erratum of the GCN 33441
- GRB 230307A: Possible optical afterglow
- GRB 230307A: ASO-S/HXI detection
- GRB 230307A: AstroSat LAXPC detection
- GRB 230307A: optical upper limit
- GRB 230307A: Swift/BAT upper limits on the early afterglow
- GRB 230307A: Upper limits from a neutrino search with IceCube
- GRB 230307A: Swift-XRT observations
- Fermi GRB 230307A: Global MASTER-Net observations report
- Konus-Wind detection of GRB 230307A
- Improved IPN localization for GRB 230307A
- GRB 230307A: VZLUSAT-2 detection
- GRB 230307A: Tiled Swift observations
- GRB 230307A: Detection by GRBAlpha
- GRB 230307A: BALROG localization (Fermi Trigger 699896651/ GRB 230307656)
- GRB 230307A: AstroSat CZTI detection
- GRB 230307A: possibly the second highest GRB energy fluence ever identified
- IPN triangulation of GRB 230307A (long/very bright)
- GRB 230307A: AGILE/MCAL detection
- GRB 230307A: Fermi GBM Observation of a very bright burst
- Solar Orbiter STIX observation of GRB 230307A
- GRB 230307A: Fermi GBM detection of a very bright GRB
- GRB 230307A: GECAM detection of an extremely bright burst
- GRB 230307A: Fermi GBM Final Real-time Localization