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').
675 results found.
- GRB 111229A: Swift/UVOT Detection
- GRB 111229A: Faulkes Telescope South observations
- GRB 111229A: GROND afterglow candidate
- GRB 111228A: GROND observations
- GRB 111212A: GROND observations
- GRB 111211A: VLT/X-shooter redshift
- GRB 111211A: Swift/XRT target of opportunity observation
- GRB 111211A: GROND afterglow candidate
- GRB 111210A: GROND observations
- GRB 111209A: Rebrightening seen by GROND
- GRB 111209A: GROND Afterglow observations
- GRB 111205A: GROND observations
- GRB 111117A: Refined GMG observation
- GRB 111204A: GROND Observations
- GRB 111129A, GROND afterglow observations
- GRB 111123A, GROND observations
- GRB 111117A: GROND observations
- GRB 111107A: GROND observations
- GRB 111018A: GROND Upper Limits
- GRB 111008A, GROND observations
- GRB 111005A: GROND NIR observations
- GRB 110825A: GROND Observations
- GRB 110918A: GROND detection of the afterglow candidate
- GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
- GRB 110915A: GROND Upper limits
- GRB 110721A: Swift observations of afterglow candidate
- GRB 110721A: Preliminary Swift/UVOT Upper Limits
- GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
- GRB 110721A: potential counterpart candidate
- GRB110715A: GROND Detection of the Optical/NIR Afterglow
- GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
- GRB 110709B: Gemini-South additional analysis and photometry
- GRB 110709B: GROND Detection of an Afterglow Candidate
- GRB 110625A: GROND detection of a source inside the XRT error circle
- GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
- GRB 110420B, GROND observations
- GRB 110414A: GROND upper limits
- GRB110407A: UVOT Upper Limits
- GRB 110407A: GROND Detection of the Optical Afterglow
- GRB 110319B: GROND upper limits
- GRB 110318B: GROND upper limits
- GRB 110312A: GROND Upper Limits
- GRB 110305A: Swift/UVOT Upper Limits
- GRB 110305A: GROND Detection of Optical Afterglow
- Swift/UVOT observations of GRB110223b
- GRB 110223B: GROND Detection of Optical Afterglow Candidate
- GRB 110213B: Swift/UVOT observations
- GRB 110213B: GROND observations of the optical/NIR afterglow
- GRB 110206A: Decay of afterglow candidate
- GRB 110206A: GROND detection of afterglow candidate
- GRB 101219B: tentative redshift and spectroscopic supernova detection
- GRB 101219B: GROND detection of a SN signature
- GRB 101219B: GROND Detection of the Optical/NIR Afterglow
- GRB 101219A: GROND Upper limits
- GRB101204A GROND Detection of the Optical/NIR Afterglow
- GRB 101201A: GROND Detection of the Optical/NIR Afterglow
- GRB 101117B: GROND Upper limits
- GRB 101114A: GROND Upper limits
- GRB 101030A: GROND optical/NIR afterglow candidate
- GRB 101024A: GROND optical/NIR observations
- Swift/UVOT observations of GRB101023A
- GGRB 101023A: GROND detection of the optical-NIR afterglow
- GRB 101011A, GROND upper limits
- GRB101008A, GROND detection of a fading afterglow
- GRB 100924A: GROND detection of an optical/NIR afterglow
- GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
- GRB 100902A: GROND observations; afterglow candidate
- GRB 100814A: GROND Detection of the Optical/NIR Afterglow
- GRB 100728A: GROND Detection of the NIR Afterglow Candidate
- GRB 100728B: GROND Detection of the NIR Afterglow
- GRB 100725A: GROND upper limits
- GRB 100724A: Swift/UVOT observations
- GRB 100724A: fading afterglow seen with GROND
- GRB 100724A, GROND detection of an afterglow candidate
- GRB 100713A: GROND upper limits
- GRB 100628A: GROND optical/NIR observations of the host candidate
- GRB100625A: GROND confirmation of constant source
- GRB 100621A: IRSF/SIRIUS NIR Observation
- GRB 100621A: Swift/UVOT observations
- GRB 100621A: VLT/X-shooter redshift
- GRB 100621A: GROND observation of bright NIR afterglow
- GRB 100615A: GROND observations, upper limits
- GRB 100606A: GROND observations
- GRB 100528A: GROND detection in all bands
- GRB100526B: GROND Upper limits
- GRB 100522A: GROND observations, upper limits
- GRB 100518A: GROND afterglow observation and photo-z
- GRB 100508A: GROND Detection of the optical afterglow
- GRB 100504A: GROND Upper limits
- GRB 100414A : EVLA Radio Detection
- GRB 100414A : WSRT Radio Detection
- GRB100425A: Swift/UVOT Upper Limits
- GRB 100425A: GROND afterglow observation
- GRB 100424A: GROND Upper Limits
- GRB 100423A: GROND discovery of afterglow
- Radio afterglow detection of GRB 100418A with the EVLA
- GRB100418A: REM possible afterglow detection
- GRB 100418A: further GROND observations and light curve fit
- GRB 100418A PAIRITEL NIR Observations
- GRB 100418A: GROND observations; missing author list added