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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"

21763 results found.

  1. GRB980613 Optical Observations
  2. GRB 980703
  3. BeppoSAX NFI observations of GRB 980703
  4. GRB980703 optical followup
  5. Radio observations of SGRs
  6. SGR1900+14 field optical observations
  7. GRB 980613: Optical transient and its host galaxy
  8. SGR1627-41, RXTE/ASM observations
  9. GRB 980613: Detection of the probable host galaxy
  10. GRB 980613 Optical Observations
  11. GRB 980613 optical observations
  12. Discovery of a new SGR source, SGR1627-41
  13. GRB980613 Optical Observations
  14. GRB980613 observations from Palomar
  15. GRB980613 Near Infra-Red Observations
  16. GRB980613, BeppoSAX WFC positions
  17. GRB971214 Secondary Standards
  18. GRB980519 Secondary Standards
  19. GRB 980519 Optical Observations
  20. GRB 980519
  21. GRB980519 optical observations
  22. GRB 980519 Optical Observations
  23. GRB980519 BATSE Observations
  24. GRB970519, optical follow-up at Schmidt Calern
  25. GRB980519 Optical Observations
  26. GRB 980519 Optical Observations
  27. GRB980515, BeppoSAX IAUC to be submitted
  28. GRB980519, BeppoSAX-WFC position
  29. BeppoSAX GRB ALERT: updated position of grb980515
  30. GRB 980425 Brightness Temperature
  31. BSAX Observations of GRB980425 field
  32. SAX J0840.7+2248 Optical Observations
  33. GRB980425: optical obs.
  34. GRB980425: Radio Observations
  35. report on BSAX observations of GRB980425
  36. GRB980326 X-ray Observations
  37. GRB980326, optical observations
  38. GRB980326, optical observations
  39. GRB980329 Keck K-band observations
  40. GRB980329 sub-millimeter observations
  41. GRB980326 optical observations
  42. GRB980329 optical observations
  43. GRB980329 VLA observations
  44. GRB980329 optical observations
  45. GRB980326 optical observations
  46. Optical Observations of GRB 970508
  47. GRB 971214: Redshift from Keck Observations
  48. Near-IR follow-up on GRB 971227
  49. Optical Observations of the GRB 971227 field
  50. Optical Observations on GRB 971227
  51. GRB971227: Plaskett R-band observations
  52. GRB 971227: Optical clarifications
  53. GRB971227: Further CAHA R-band images
  54. GRB971227: LOTIS observations
  55. GRB971214: Optical Observations and Calibrations
  56. Sub-millimeter Observations of GRB 971214 at the JCMT
  57. GRB 971214: KPNO Optical Observations
  58. Optical Observations of GRB 971214 at Keck
  59. GRB 971214: Optical Observations
  60. Radio Observations of GRB 971214 at the VLA
  61. GRB 971024: KPNO Optical Observations
  62. RXTE Observations of SGR 1814-13
  63. GRB 970828: Palomar Observations

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