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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.

Advanced Search Examples (click to copy):

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

35152 results found.

  1. GRB 980329 ROSAT observation
  2. GRB980326 X-ray Observations
  3. GRB980326, optical observations
  4. GRB980326, optical observations
  5. GRB980329, Fading IR counterpart to radio source
  6. GRByymmdd, Announcement of automation
  7. GRB980326 IPN annulus
  8. GRB980329 sub-millimeter observations
  9. GRB980329 IPN annulus
  10. GRB980329 near-IR observations
  11. GRB980326 optical observations
  12. GRB980329 optical observations
  13. GRB980329 VLA observations
  14. GRB980329 near IR observations
  15. GRB980329 optical observations
  16. GRB980329 optical observations
  17. GRB980326 optical observations
  18. GRB980326 optical observations
  19. GRB970508 SAO RAS optical observations
  20. Optical Observations of GRB 970508
  21. GRB 971214: Redshift from Keck Observations
  22. Near-IR follow-up on GRB 971227
  23. GRB971214: Keck R & I-band Observations
  24. GRB 971227: Optical Observations
  25. Optical Observations of the GRB 971227 field
  26. Optical Observations on GRB 971227
  27. GRB971227: Plaskett R-band observations
  28. GRB 971227: Optical clarifications
  29. Optical Observations for GRB 971227
  30. GRB971227: Further CAHA R-band images
  31. GRB971227: LOTIS observations
  32. GRB 971227: CAHA R-band images
  33. GRB 971227: Optical observations
  34. Sub-millimeter Observations of GRB 971214 at the JCMT
  35. GRB 971214: EUVE Observations
  36. GRB 971214: Redshift from Keck Optical Observations
  37. GRB 971214: Redshift from Keck Optical Observations
  38. GRB 971214: Apache Point Observatory Optical Observations
  39. GRB 971214: KPNO Optical Observations
  40. Optical Observations of GRB 971214 at Keck
  41. GRB 971214: Optical Observations
  42. Radio Observations of GRB 971214 at the VLA
  43. GRB 971214: USNOFS Observations Summary
  44. GRB 971024: KPNO Optical Observations Summary
  45. GRB 971024: Refined analysis by USNOFS Observations
  46. GRB 971024: KPNO Optical Observations
  47. GRB 971024: USNO Observations
  48. GRB 970925: BATSE Localization
  49. IRAS 18119-1342 and the possible new SGR
  50. Possible new SGR from US Naval Observatory
  51. GRB 970828: Palomar Observations
  52. GRB 970228: Keck/LRIS Optical Observations

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