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 220514A: KAIT Optical Afterglow Confirmation
- GRB 220408A: HCT optical upper limit
- GRB 220408A: GRANDMA observations
- GRB 220408A: Lowell Discovery Telescope Optical Observations
- GRB 220408A: Swift-BAT refined analysis
- GRB 220408A: RATIR Optical and NIR Observations
- GRB 220408A: 1.3m DFOT Optical upper limit
- GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
- GRB 220408A: redshift lower limit estimating
- GRB 220408A: NOT optical observations and archival detection
- GRB 220408A: LCO Optical Afterglow Detection
- GRB 220408A: Swift-XRT refined Analysis
- GRB 220408A: BOOTES-5/JGT optical afterglow detection
- GRB 220408A: GIT optical upper limit
- GRB 220408A: Fermi GBM observation
- GRB 220408A: Swift/UVOT Detection
- GRB 220408A: Xinglong-2.16m optical upper limit
- GRB 220408A: Enhanced Swift-XRT position
- Chandra upper limit at the location of GRB 220408A
- GRB 220408A: KAIT Optical Observations
- Fermi GRB 220408A: Global MASTER-Net observations report
- GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
- GRB 220408A: Fermi GBM Final Real-time Localization