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"

28114 results found.

  1. GRB 081127: Swift-BAT refined analysis
  2. GRB 081126: Swift-XRT refined analysis
  3. GRB 081127: Swift detection of a burst
  4. GRB 081126: Swift/UVOT Observations
  5. GRB 081126: optical observations
  6. GRB 081126: Swift-BAT refined analysis
  7. GRB 081126: Enhanced Swift-XRT position
  8. GRB 081126: TAROT Calern observatory optical observations
  9. GRB 081126: Swift detection of a burst
  10. GRB 081125: Fermi GBM detection
  11. GRB 081124: Fermi GBM detection
  12. GRB 081120: Fermi GBM detection
  13. GRB 081118: Fermi GBM detection.
  14. GRB 081122: Fermi GBM detection
  15. GRB 081121, SMARTS optical/IR afterglow observations
  16. Fermi GBM detection of a weak source
  17. GRB081121: Refined Swift/UVOT observations
  18. GRB 081121: Swift-XRT refined analysis
  19. GRB 081121: Enhanced Swift-XRT position
  20. GRB 081121: GROND observations
  21. GRB 081121: Swift-BAT refined analysis
  22. GRB081121: Swift/UVOT observations
  23. GRB 081121: ROTSE-III Detection of Optical Counterpart
  24. GRB081118 : optical upper limit
  25. GRB 081119: Fermi GBM detection
  26. VLA Radio upper limit on GRB 081118
  27. GRB 081118: Swift-XRT refined analysis
  28. GRB 081118: GROND detection of afterglow
  29. GRB 081118: optical afterglow candidate
  30. GRB 081118: Swift UVOT Upper Limits
  31. GRB 081118: Swift-BAT refined analysis
  32. GRB 081118: Enhanced Swift-XRT position
  33. GRB 081118: Swift detection of a burst
  34. GRB 081109A: confirmation of possible detection host galaxy
  35. Further Swift-XRT observations of the probable GRB 081105.
  36. GRB 081113: Fermi GBM detection
  37. GRB 081102: RTT150 Optical observations
  38. GRB 081110: Fermi GBM detection
  39. GRB 081109: TAROT La Silla observatory optical observations
  40. GRB 081102: MASTER refind and final results
  41. GRB 081109: GROND redshift limit and host extinction
  42. GRB 081025: Swift-XRT further analysis
  43. GRB 081024B: Swift-XRT late-time observations
  44. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  45. GRB 081109A, Swift-BAT refined analysis
  46. GRB 081109A: Swift-XRT refined analysis
  47. GRB 081109: Fermi GBM detection
  48. Swift-BAT Trigger 334129: possible burst
  49. GRB 081109: REM NIR afterglow detection
  50. GRB 081109: Swift detection of a burst
  51. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  52. SGR 1806-20: Fermi GBM detection
  53. GRB 081102B: Fermi GBM detection
  54. GRB 081105B: Fermi GBM detection
  55. GRB 081107: Fermi GBM detection
  56. GRB 081104: GROND found no Optical/NIR Afterglow
  57. GRB 081105: GROND Upper Limits
  58. Radio observation of GRB 080523 with ATCA
  59. Radio observation of GRB 080520 with ATCA
  60. GRB 081105: Observations from OSN
  61. Swift-XRT observations of GRB 081105
  62. GRB 081101B: Fermi GBM detection
  63. Radio observation of GRB 080516 with ATCA
  64. GRB 081105 Swift/BAT and IPN Localization
  65. GRB 081025: Fermi GBM observation
  66. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  67. GRB 081104: refined XRT analysis
  68. GRB 081104: Enhanced Swift-XRT position
  69. GRB 081104: Swift-BAT refined analysis
  70. GRB 081104 : Faulkes Telescope South observations
  71. Radio observation of GRB 080130 with ATCA
  72. GRB 081102: MASTER prompt optical limit
  73. GRB 081102: Swift-XRT refined analysis
  74. GRB 081102: Swift-BAT refined analysis
  75. GRB 081102: Enhanced Swift-XRT position
  76. Radio observation of GRB 080218b with ATCA
  77. Radio observation of GRB 080229a with ATCA
  78. GRB 081102: MASTER VWF promt observation
  79. GRB 081102: Swift detection of a burst
  80. SGR 0501+4516: optical observations in August
  81. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  82. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  83. GRB 081024B: BTA deep optical observations
  84. GRB 081024B: new Swift-XRT observations
  85. Radio observation of GRB 080229b with ATCA
  86. GRB 081024B: VLA radio observation
  87. GRB 081029: UVOT Detection of the Optical Afterglow
  88. GRB 081029: Swift-BAT refined analysis
  89. GRB081029: Swift XRT refined analysis
  90. GRB 081025: Suzaku WAM observation of the prompt emission
  91. GRB 081029: Enhanced Swift-XRT position
  92. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  93. GRB 081029: REM observations
  94. Radio observation of GRB 080303 with ATCA
  95. Radio observation of GRB 080411 with ATCA
  96. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  97. GRB 081029: ROTSE-III Detection of Optical Counterpart
  98. GRB 081028B: Fermi GBM detection
  99. GRB 081021: Fermi GBM detection
  100. Swift UVOT observations of GRB081028

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