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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"

39 results found.

  1. GRB 151027A: the missing GeV component
  2. GRB 150513A: request for X-ray follow up
  3. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  4. GRB 140108A: theoretical prediction of redshift and of supernova occurrence
  5. GRB 131202A: theoretical estimation of the redshift
  6. GRB 060614: theoretical derivation of the redshift and need for deeper search of the host galaxy
  7. GRB 121217A theoretical estimate of redshift and of supernova occurrence
  8. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  9. GRB 090618: Mondy optical observations
  10. GRB 090618: RTT150 optical observations
  11. GRB 090618: SARA Second Epoch Observations
  12. GRB 090618: Correction to GCN 9568
  13. GRB 090618: Suzaku WAM observation of the prompt emission
  14. PAIRITEL observations of GRB 090618
  15. Konus-Wind and Konus-RF observations of GRB 090618
  16. GRB 090618: RTT150 optical observations
  17. GRB 090618: BOAO V-band Observation
  18. GRB 090618: ZTSh optical observations
  19. GRB 090618 : WSRT radio detection
  20. GRB 090618: Fermi GBM observation
  21. GRB 090618, Swift-BAT refined spectral analysis
  22. VLA radio detection of GRB 090618
  23. GRB 090618 15GHz radio detection
  24. GRB 090618: Swift-BAT refined analysis
  25. GRB 090618: SARA observations
  26. GRB090618: Swift-XRT team refined analysis
  27. GRB090618: Swift/UVOT bright afterglow detection
  28. GRB 090618: SDSS host detection
  29. GRB 090618: AGILE observations
  30. GRB 090618: LOAO R-band Observation
  31. GRB 090618: Enhanced Swift-XRT position
  32. GRB 090618 Faulkes Telescope North observations
  33. Optical observations of GRB 090618
  34. GRB 090618: Lick/KAST Spectroscopy
  35. GRB 090618: OA behavior from KAIT
  36. GRB 090618: planned XMM-Newton observation
  37. GRB 090618: ROTSE-III Detection of Optical Counterpart
  38. GRB 090618: KAIT optical afterglow
  39. GRB 090618: Swift detection of a bright burst with optical afterglow

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