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').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"14323 results found.
- GRB 130603B: 5.8 GHz VLA detection
- GRB 130603B: Afterglow detection from NOT
- Swift/UVOT observations of GRB130603A
- GRB 130603B: Swift detection of a bright short burst
- GRB 130603A: Swift detection of a burst
- GRB 130528A: Fermi GBM detection
- GRB 130527A: Suzaku WAM observation of the prompt emission
- GRB 130518A: Suzaku WAM observation of the prompt emission
- GRB 130529A: Swift detection of a burst
- GRB 130521A: Skynet/PROMPT detection of an extremely red afterglow
- GRB 130528A: Swift detection of a burst
- GRB 130527A: BOOTES-2 & 3.5m CAHA opt/nIR observations
- GRB 130527A: Swift detection of a bright burst
- GRB 130521B: Suzaku WAM observation of the prompt emission
- Swift Trigger 556533 is probably not an astrophysical event
- GRB 130521A: Swift detection of a burst
- GRB 130518A: mm detection at PdBI
- GRB 130515A: Suzaku WAM observation of the prompt emission
- Konus-Wind observation of GRB 130518A
- GRB 130518A: Fermi LAT detection
- GRB 130518A: Fermi GBM detection
- GRB 130515A: IRSF NIR Observation
- Konus-Wind observation of GRB 130515A
- GRB 130514B: RATIR Optical and NIR Observations
- GRB 130515A: Fermi GBM detection
- GRB 130515A: Swift detection of a short burst
- GRB 130427A: Spectroscopic detection of the SN from the 10.4m GTC
- GRB 130514A: RATIR Optical and NIR Observations
- GRB 130513A: Swift-XRT detection of the afterglow.
- GRB 130514A: P60 Observations
- GRB 130514A: Swift detection of a burst
- GRB 130427A: Tautenburg 2nd epoch: No break, no clear SN
- GRB 130511A: Swift detection of a burst with an optical counterpart
- GRB 130427A: host galaxy observations
- Fermi Trigger 130507.091 - Detection of a SGR-like Burst
- GRB 130508A: Swift detection of a probable burst
- GRB 130427A, LBT optical spectrum
- GRB 130505B: Further Swift observations
- GRB 130504C: Suzaku WAM observation of the prompt emission
- GRB 130427A, Watcher afterglow detection
- GRB 130505B: Swift Candidate Afterglow
- Konus-Wind observation of GRB 130504C
- GRB 130505B: MAXI/GSC detection
- GRB 130504C: Fermi GBM detection
- GRB 130505A: Largest E_iso ever measured
- GRB 130504C: Fermi-LAT detection of a burst
- Swift/UVOT observations of GRB130505A
- GRB 130505A: MAXI/GSC detection
- Konus-Wind observation of GRB 130504B
- GRB 130505A: Swift detection of a burst with optical afterglow
- GRB 130504B: Fermi GBM detection
- GRB 130502B: Suzaku WAM observation of the prompt emission
- Trigger 555096: Swift detection of a possible burst
- GRB 130427A: Non-observation of VHE emission with HAWC
- GRB 130502A: Fermi GBM detection
- Konus-Wind observation of GRB 130502B
- GRB 130502B: Fermi LAT Detection
- GRB 130502B: Fermi GBM detection of a burst
- GRB 130502A: Swift detection of a burst
- GRB 130425A: Suzaku WAM observation of the prompt emission
- GRB 130427A: VLA 20 GHz detection
- GRB 130427A: GMRT radio detection
- GRB 130427A: Continued GMG optical observations
- GRB 130427A: high energy gamma-ray detection by AGILE
- GRB 130427A: further GMG observations
- GRB 130427A: SARA-N detection
- GRB 100728A: GROND host detection and X-shooter redshift
- Konus-Wind observation of GRB 130427A
- GRB 130427A: SPI-ACS/INTEGRAL observations
- GRB 130427A: CARMA 85 GHz detection
- GRB 130427A: VLA 5 GHz detection
- GRB 130427A: Fermi-LAT detection of a burst
- GRB 130427A: GMG optical observation
- GRB 130427A: MAXI/GSC detection
- GRB 130427B: Faulkes Telescope North afterglow detection
- GRB 130427B: Swift detection of a burst with optical counterpart
- GRB 130427A: Faulkes Telescope North detection
- GRB 130427A: P60 early detection
- GRB 130427A: P60 early nondetection
- GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
- Konus-Wind observation of GRB 130425A
- IPN Triangulation of GRB 130425A
- Trigger 554491: Swift detection of a spike possibly from Sgr A*
- GRB 130425A: Fermi GBM detection
- Swift Trigger 554135 is probably not a GRB or transient
- GRB 130420A: Swift/UVOT Detection
- GRB130420B: GMG optical upper limit
- GRB 130420A: GMG optical observation
- GRB 130420B: Swift detection of a burst
- GRB 130420A: ROTSE-III Detection of Optical Counterpart
- GRB 130420A: Swift detection of a burst with an optical counterpart
- GRB 130418A: Submm observations from SMA
- Trigger 553930: Swift detection of a possible flare from HR 5110
- GRB 130418A: LOAO Observation
- GRB 130419A: Swift detection of a burst
- GRB 130418A: CARMA 3mm detection
- GRB 130418A: GROND detection of the optical-NIR afterglow
- GRB130418A: OSN 1.5m fading afterglow detection
- GRB 130418A: Swift/UVOT Detection and request for continuing coverage
- GRB 130418A: Swift detection of a burst with an optical counterpart