Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28115 results found.

  1. GRB 090715B: Skynet/PROMPT Detections
  2. GRB 090726: Skynet/GORT Observations
  3. GRB 090916: Swift-XRT upper limit
  4. GRB 090807: Skynet/DSO Observations
  5. GRB 090915: GROND upper limits
  6. Short-Duration GRB 090916: Skynet/PROMPT Observations
  7. GRB 090915: SARA detection of afterglow candidate
  8. GRB 090912: optical observation
  9. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  10. GRB 090702: Skynet/GORT Observations
  11. GRB 090902B: Skynet/PROMPT Observations
  12. GRB 090916, Swift-BAT refined analysis
  13. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  14. GRB 090915 Swift-BAT detection of a burst in ground analysis
  15. GRB 090827: Confirmation of the X-ray afterglow
  16. GRB 090912: Swift-XRT refined analysis
  17. GRB 090912, Swift-BAT refined analysis
  18. GRB 090912: Swift/UVOT Upper Limits
  19. GRB 090912 optical upper limit
  20. GRB 090912: Enhanced Swift-XRT position
  21. GRB 090912: Swift detection of a burst
  22. GRB 090910: Fermi GBM detection
  23. GRB 090814A: Skynet/DSO & GORT Observations
  24. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  25. GRB 090904B: GROND detection of the optical afterglow
  26. GRB 090831A: Suzaku WAM observation of the prompt emission
  27. GRB 090904B: Swift/UVOT Refined Analysis
  28. GRB 090902B: Suzaku WAM observation of the prompt emission
  29. GRB 090829A: Suzaku WAM observation of the prompt emission
  30. GRB 090904B: Fermi GBM detection
  31. GRB 090904A: Swift-XRT refined analysis
  32. GRB 090904B: Swift XRT Refined Analysis
  33. GRB 090904B: Swift-BAT refined analysis
  34. GRB 090902B: VLA radio detection
  35. GRB 090904A: Swift-BAT refined analysis
  36. GRB 090904B: Enhanced Swift-XRT position
  37. GRB 090904A: Enhanced Swift-XRT position
  38. GRB 090904A: NOT observations
  39. GRB090904B: REM observations
  40. GRB 090904B: Swift detection of a burst
  41. GRB 090904: Swift detection of a burst
  42. GRB 090902B: Swift/UVOT refined analysis
  43. GRB090902B: Swift XRT refined analysis
  44. GRB 090902B: Faulkes Telescope North observations
  45. GRB 090902B: GROND NIR Afterglow Observations
  46. GRB 090902B: Enhanced Swift-XRT position
  47. GRB 090902B: Optical afterglow candidate
  48. GRB090902B: Swift/UVOT observations
  49. GRB 090902B: Swift/XRT Afterglow Candidate
  50. GRB 090902B: Fermi LAT detection
  51. GRB 090902B: Fermi GBM detection of a bright burst
  52. GRB 090902: Fermi GBM detection
  53. GRB 090831A: IPN Triangulation
  54. GRB 090831C BAT refined analysis
  55. GRB 090831C: GROND upper limits
  56. Swift Trigger 361477, called GRB090831B, is probably not real.
  57. GRB090831C: Swift/UVOT upper limits
  58. GRB 090831B: MITSuME optical upper limits
  59. GRB 090831C: Swift XRT Refined Analysis
  60. GRB 090829B: Fermi GBM Detection
  61. GRB 090831C: Enhanced Swift-XRT position
  62. GRB 090831C: Swift detection of a burst
  63. GRB 090831B, RIMOTS optical upper limits
  64. GRB 090831: MAXI GSC detection
  65. GRB 090831B: Swift detection of a possible burst
  66. GRB 090831: Fermi GBM detection
  67. GRB090829: Fermi GBM Detection
  68. GRB 090827: Swift XRT and UVOT observations
  69. GRB 090827 Burst discovered in BAT ground analysis
  70. GRB 090826: Fermi GBM detection
  71. GRB 090828: Fermi GBM detection
  72. GRB 090817 - TLS Observations
  73. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  74. GRB 090823 Long burst with IPN triangulation and BAT position
  75. GRB 090820B: Fermi GBM detection
  76. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  77. GRB 090820: MASTER-Net optical polarization observations
  78. GRB 090820: Fermi GBM Detection of a bright burst.
  79. GRB 090817: optical upper limit
  80. GRB 090817: Confirmation of the X-ray afterglow
  81. GRB 090815C: Swift refined analysis
  82. GRB 090817: Fermi GBM observation
  83. GRB 090817: Swift/UVOT Upper Limits
  84. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  85. GRB 090817: Swift-XRT observations
  86. GRB 090814A: optical observations
  87. GRB 090813: Suzaku WAM observation of the prompt emission
  88. GRB 090812: Suzaku WAM observation of the prompt emission
  89. VLA radio non-detection of GRB 090812
  90. GRB 090815B: Fermi GBM detection
  91. GRB 090815: Fermi GBM detection
  92. GRB 090813: CrAO optical obsevations
  93. GRB090814A: NOT optical follow-ups
  94. GRB 090814B: Swift/UVOT Upper Limits
  95. GRB 090814B: Liverpool Telescope Observations
  96. GRB 090814C: Fermi GBM detection
  97. GRB 090814B: Swift-XRT detection of a possible afterglow.
  98. GRB 090814A: Swift/UVOT Observations
  99. GRB 090814A: Swift-XRT Team Refined Analysis
  100. GRB 090814A, RIMOTS optical upper limits

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov