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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"

35263 results found.

  1. BATSE on-board GRB trigger change
  2. BeppoSAX GRB ALERT: updated position of grb980515
  3. GRB 980425 Radio Light Curve
  4. GRB 980425 Brightness Temperature
  5. GRB980425 BATSE observations
  6. SAX J0840.7+2248 Optical Observations
  7. GRB 980425 optical observations
  8. GRB980425: optical obs.
  9. GRB980425: Radio Observations
  10. GRB 980425 optical observations
  11. GRB 980425 optical observations
  12. GRB 980329 ROSAT observation
  13. GRB980326 X-ray Observations
  14. GRB980326, optical observations
  15. GRB980326, optical observations
  16. GRB980329, Fading IR counterpart to radio source
  17. GRByymmdd, Announcement of automation
  18. GRB980326 IPN annulus
  19. GRB980329 sub-millimeter observations
  20. GRB980329 IPN annulus
  21. GRB980329 near-IR observations
  22. GRB980326 optical observations
  23. GRB980329 optical observations
  24. GRB980329 VLA observations
  25. GRB980329 near IR observations
  26. GRB980329 optical observations
  27. GRB980329 optical observations
  28. GRB980326 optical observations
  29. GRB980326 optical observations
  30. GRB970508 SAO RAS optical observations
  31. Optical Observations of GRB 970508
  32. GRB 971214: Redshift from Keck Observations
  33. Near-IR follow-up on GRB 971227
  34. GRB971214: Keck R & I-band Observations
  35. GRB 971227: Optical Observations
  36. Optical Observations of the GRB 971227 field
  37. Optical Observations on GRB 971227
  38. GRB971227: Plaskett R-band observations
  39. GRB 971227: Optical clarifications
  40. Optical Observations for GRB 971227
  41. GRB971227: Further CAHA R-band images
  42. GRB971227: LOTIS observations
  43. GRB 971227: CAHA R-band images
  44. GRB 971227: Optical observations
  45. Sub-millimeter Observations of GRB 971214 at the JCMT
  46. GRB 971214: EUVE Observations
  47. GRB 971214: Redshift from Keck Optical Observations
  48. GRB 971214: Redshift from Keck Optical Observations
  49. GRB 971214: Apache Point Observatory Optical Observations
  50. GRB 971214: KPNO Optical Observations
  51. Optical Observations of GRB 971214 at Keck
  52. GRB 971214: Optical Observations
  53. Radio Observations of GRB 971214 at the VLA
  54. GRB 971214: USNOFS Observations Summary
  55. GRB 971024: KPNO Optical Observations Summary
  56. GRB 971024: Refined analysis by USNOFS Observations
  57. GRB 971024: KPNO Optical Observations
  58. GRB 971024: USNO Observations
  59. GRB 970925: BATSE Localization
  60. IRAS 18119-1342 and the possible new SGR
  61. Possible new SGR from US Naval Observatory
  62. GRB 970828: Palomar Observations
  63. GRB 970228: Keck/LRIS Optical Observations

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