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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"

20974 results found.

  1. GRB980703 - BeppoSAX/GRBM detection
  2. GRB 980703 (NFI observations)
  3. GRB980703 optical photometry
  4. GRB980703 optical observations
  5. GRB980703: Radio transient
  6. RXTE Observation of GRB 980706
  7. GRB980703 Transient Optical Follow-Up
  8. GRB980703: LOTIS observation at early times
  9. GRB980613 Optical Observations
  10. GRB 980703
  11. BeppoSAX NFI observations of GRB 980703
  12. GRB980703 optical followup
  13. Radio observations of SGRs
  14. SGR1900+14 field optical observations
  15. GRB 980613 Near-IR observations
  16. GRB 980613: Optical transient and its host galaxy
  17. SGR1627-41, RXTE/ASM observations
  18. GRB 980613: Detection of the probable host galaxy
  19. GRB 980613 Optical Observations
  20. GRB 980613 optical observations
  21. Discovery of a new SGR source, SGR1627-41
  22. GRB980613 Optical Observations
  23. GRB980613 observations from Palomar
  24. GRB980613 Near Infra-Red Observations
  25. GRB971214 Secondary Standards
  26. GRB980519 Secondary Standards
  27. BATSE on-board GRB trigger change
  28. GRB 980519 Optical Observations
  29. GRB980519 optical observations
  30. GRB 980519
  31. GRB980519 optical observations
  32. GRB 980519 Optical Observations
  33. GRB980519 Optical Observations
  34. GRB 980519 Optical Observations
  35. GRB980515, BeppoSAX IAUC to be submitted
  36. BATSE on-board GRB trigger change
  37. GRB980519, BeppoSAX-WFC updated position
  38. GRB980515: SAX-WFC updated position
  39. GRB 980425 Radio Light Curve
  40. BSAX Observations of GRB980425 field
  41. IPN web site of GRBs
  42. SAX J0840.7+2248 Optical Observations
  43. GRB980425: optical obs.
  44. GRB980425: Radio Observations
  45. report on BSAX observations of GRB980425
  46. GRB 980329 ROSAT observation
  47. GRB980326 X-ray Observations
  48. GRB980326, optical observations
  49. GRB980326, optical observations
  50. GRB980329
  51. GRB980329 Keck K-band observations
  52. GRB980326 optical observations
  53. GRB980329 optical observations
  54. GRB980329 VLA observations
  55. GRB980329 optical observations
  56. GRB980326 optical observations
  57. GRB980326 optical observations
  58. GRB980326 optical observations
  59. Optical Observations of GRB 970508
  60. Near-IR follow-up on GRB 971227
  61. Optical Observations of the GRB 971227 field
  62. Optical Observations on GRB 971227
  63. GRB971227: Plaskett R-band observations
  64. GRB 971227: Optical clarifications
  65. GRB971227: Further CAHA R-band images
  66. GRB971227: LOTIS observations
  67. GRB971214: Optical Observations and Calibrations
  68. Sub-millimeter Observations of GRB 971214 at the JCMT
  69. GRB 971214: EUVE Observations
  70. GRB 971214: KPNO Optical Observations
  71. GRB 971214: Optical Observations
  72. Radio Observations of GRB 971214 at the VLA
  73. GRB 971024: KPNO Optical Observations
  74. GRB 970828: Palomar Observations

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