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').
23 results found.
- GRB 220521A: ATCA detection
- GRB 220521A: ALMA detection
- GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
- GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
- GRB 220521A: ISON-Castelgrande observatory optical observations
- GRB 220521A: MITSuME Akeno optical upper limits
- GRB 220521A: Gemini Observations
- GRB 220521A: MMT Afterglow Imaging
- GRB 220521A: REM optical/NIR upper limits
- GRB 220521A: LCO Optical Detection
- GRB 220521A: Swift-BAT refined analysis
- GRB 220521A: Fermi GBM detection
- GRB 220521A: Sintesz-Newton/CrAO optical upper limit
- GRB 220521A: RATIR Optical and NIR Observations
- GRB 220521A: Swift-XRT refined Analysis
- GRB 220521A: Swift/UVOT Upper Limits
- GRB 220521A: SAO RAS optical observations
- GRB 220521A: Enhanced Swift-XRT position
- GRB 220521A: NOT spectroscopic redshift
- GRB 220521A: NOT optical afterglow detection
- GRB 220521A: Prompt enhanced Swift-XRT position
- GRB 220521A: Swift detection of a burst
- GRB 220521A: Fermi GBM Final Real-time Localization