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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').
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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

30 results found.

  1. GRB 240414A: further radio observations with the VLA
  2. GRB 240414A: NOEMA detection
  3. GRB 240414A: radio detection with the VLA
  4. GRB 240414A: AMI-LA radio observations
  5. GRB 240414A: LBT optical detection
  6. GRB 240414A: Glowbug gamma-ray detection
  7. GRB 240414A: Swift-BAT refined analysis
  8. GRB 240414A: AbAO optical upprer limit
  9. GRB 240414A: GAD Observatory, La Spezia, Italy ,upper limit
  10. GRB 240414A: GMG observation
  11. EP 240414a: BOOTES-4/MET Optical Upper Limits
  12. GRB 240414A: Fermi GBM Observation
  13. GRB 240414A: Photometric observation from 2.2m CAHA
  14. GRB 240414A: Swift/UVOT Detection
  15. GRB 240414A: Mondy optical observations
  16. GRB 240414A: AKO Optical Upper Limit
  17. X-ray transient EP 240414a - GTC spectroscopic observations
  18. EP 240414a: NOT optical counterpart confirmation
  19. GRB 240414A: Swift-XRT refined Analysis
  20. GRB240414A : J-band upper limits from WINTER
  21. GRB 240414A: Enhanced Swift-XRT position
  22. GRB 240414A : OHP/T193 second epoch of optical follow-up and afterglow detection
  23. GRB 240414A: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  24. GRB 240414A: Skynet Optical Afterglow Observations
  25. Swift GRB 240414A: Global MASTER-Net observations report
  26. GRB 240414A : MITSuME Akeno optical upper limits
  27. GRB 240414A: Redshift confirmation from GTC/OSIRIS+
  28. GRB 240414A : OHP/T193 redshift determination
  29. GRB 240414A : OHP/T193 optical counterpart detection
  30. GRB 240414A: Swift detection of a burst

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