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').
26 results found.
- GRB 211024B: CAHA 2.2m Detection; ultra-long GRB?
- GRB 170714A: NOEMA non-detection of the Bastille Day Burst
- GRB 170714A: Bastille Day Burst: ULGRB or RTDE?
- GRB 130925A: continuing Swift/XRT monitoring
- Konus-Wind observation of GRB 130925A
- GRB111209A: ATCA detection at 5.5, 9, and 18GHz
- GRB 111209A: RAPTOR Limits Before and During the Gamma-ray Emitting Interval
- GRB 111209A - ATCA 34GHz upper limit
- Konus-Wind observation of GRB 111209A
- GRB 111209A: Rebrightening seen by GROND
- GRB 111209A: IRTF NIR Imaging/Spectroscopy
- GRB 111209A: VLT/X-shooter redshift
- GRB 111209A: GROND Afterglow observations
- GRB 111209A optical limit by "Pi of the Sky"
- GRB 111209A: PROMPT optical observations of early afterglow
- GRB 111209A: Swift-XRT refined Analysis
- GRB 111209A: Swift UVOT refined analysis
- GRB 111209A: Swift Burst of Interest
- GRB 111209A, Swift-BAT refined analysis
- GRB 111209A: Enhanced Swift-XRT position
- GRB111209A : planned XMM-Newton observation
- GRB 111209A: TAROT La Silla observatory optical light curve analysis
- GRB 111209A: Faulkes Telescope North observations
- GRB 111209A: REM NIR detection
- GRB 111209A: TAROT La Silla observatory optical detection
- GRB 111209A: Swift detection of a long burst with an optical counterpart