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').
24 results found.
- GRB 210919A: Maidanak optical observations
- GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
- GRB 210919A: LBT spectroscopic redshift of the host galaxy candidates
- GRB 210919A: FORS2/VLT observations
- GRB 210919A: LDT optical observations and candidate host galaxies
- GRB 210919A: iTelescope T-11 upper limits
- GRB 210919A OSN 1.5m Source Confirmation
- GRB 210919A CAHA 2.2m Observations: Afterglow/Host Galaxy Candidate
- GRB 210919A: Chandra rapid ToO upper limit
- GRB 210919A: DECam Upper Limits
- GRB 210919A: Swift-BAT refined analysis
- GRB 210919A: Lowell Discovery Telescope upper limits (correction to GCN 30859)
- GRB 210919a: Lowell Discovery Telescope upper limits
- GRB 210919A: Swift/UVOT Upper Limits
- GRB 210919A: LOAO and LSGT optical upper limits
- GRB 210919A: MITSuME Akeno optical upper limits
- GRB 210919A: Swift-XRT refined Analysis
- GRB 210919A: NOT upper limits
- GRB 210919A: AbAO optical upper limit
- GRB 210919A: Enhanced Swift-XRT position
- GRB 210919A: LCO Optical Upper Limit
- GRB 210919A: BOOTES-2/TELMA optical upper limit
- Swift GRB 210919A: Global MASTER-Net observations report
- GRB 210919A: Swift detection of a short burst