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"

21471 results found.

  1. GRB 081109: GROND redshift limit and host extinction
  2. GRB 081025: Swift-XRT further analysis
  3. GRB 081024B: Swift-XRT late-time observations
  4. Swift-BAT refined analysis of trigger 334129
  5. GRB 081109B: Swift/UVOT refined analysis
  6. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  7. GRB 081109A: Possible Swift-UVOT detection
  8. GRB 081109A, Swift-BAT refined analysis
  9. GRB 081109A: Swift-XRT refined analysis
  10. GRB 081109: Fermi GBM detection
  11. GRB 081109: Swift/UVOT upper limits
  12. Swift-BAT Trigger 334129: possible burst
  13. GRB 081109: REM NIR afterglow detection
  14. GRB 081109: Swift detection of a burst
  15. GRB 081105: GROND Upper Limits
  16. GRB 081105: Observations from OSN
  17. UVOT/Swift observations of GRB081105
  18. Swift-XRT observations of GRB 081105
  19. GRB 081105 Swift/BAT and IPN Localization
  20. GRB 081025: Fermi GBM observation
  21. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  22. GRB 081104: refined XRT analysis
  23. GRB 081104: Enhanced Swift-XRT position
  24. GRB 081104: Swift-BAT refined analysis
  25. GRB081104: Swift/UVOT Upper Limits
  26. Fermi Detection of GRB 081102
  27. GRB 081104 : Faulkes Telescope South observations
  28. GRB 081104: Swift-XRT position
  29. GRB 081104: Swift detection of a burst
  30. GRB 081102: MASTER prompt optical limit
  31. GRB 081102: Swift-XRT refined analysis
  32. GRB 081102: Swift/UVOT refined analysis
  33. GRB 081102: Swift-BAT refined analysis
  34. GRB 081102: Enhanced Swift-XRT position
  35. Radio observation of GRB 080218b with ATCA
  36. GRB 081102: MASTER VWF promt observation
  37. GRB 081102: OPTIMA-Burst optical upper limit
  38. GRB 081102: Swift detection of a burst
  39. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  40. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  41. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  42. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  43. GRB 081024B: BTA deep optical observations
  44. GRB 081028: CrAO optical observations
  45. GRB 081024B: new Swift-XRT observations
  46. Radio observation of GRB 080229b with ATCA
  47. GRB 081029: UVOT Detection of the Optical Afterglow
  48. GRB 081029: Swift-BAT refined analysis
  49. GRB081029: Swift XRT refined analysis
  50. GRB 081029: Enhanced Swift-XRT position
  51. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  52. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  53. GRB 081029: ROTSE-III Detection of Optical Counterpart
  54. GRB 081029: Swift detection of a burst
  55. GRB081028: UVOT detection of a brightening afterglow
  56. Swift UVOT observations of GRB081028
  57. GRB 081028: Swift-XRT refined analysis
  58. GRB 081028, Swift-BAT refined analysis
  59. GRB 081028: Enhanced Swift-XRT position
  60. GRB 081028: TAROT Calern observatory optical observations
  61. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  62. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  63. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  64. GRB 081028: Swift detection of a burst
  65. GRB 081024: No radio detection with the VLA
  66. GRB081025: RTT150 optical observations
  67. GRB081024B: P200 Observations
  68. GRB 081024B: Swift-XRT further observations
  69. GRB 081025 BAT refined analysis
  70. Swift UVOT observations of GRB081025
  71. Swift UVOT observations of GRB081024B
  72. Konus-Wind observation of GRB 081025
  73. GRB 081025: Swift-XRT position
  74. GRB 081024B: Swift-XRT observations
  75. GRB 081025: Burst detection from Swift-BAT slew data
  76. Swift UVOT observations of GRB 081024
  77. GRB 081024: Swift-XRT refined analysis
  78. GRB 081024, Swift-BAT refined analysis
  79. GRB 081024: Enhanced Swift-XRT position
  80. GRB 081024: Faulkes Telescope North optical observations
  81. GRB 081024: KAIT Optical Limits
  82. GRB 081024: Early Super-LOTIS Observations
  83. GRB 081024A: ROTSE-III Optical Limits
  84. GRB 081024: Swift detection of a burst
  85. GRB 081022, Swift-BAT refined analysis
  86. GRB 081016A: Swift-XRT refined analysis
  87. GRB 081022: Swift detection of a burst
  88. GRB 081012: Swift-XRT Refined Analysis
  89. Swift trigger 332287 is not a GRB
  90. Swift detection of a possible burst (trigger 332287)
  91. GRB 081012 - Enhanced Swift XRT position
  92. GRB 081017, Swift-BAT refined analysis
  93. GRB 081017: Swift detection of a burst
  94. GRB 081016B, Swift-BAT refined analysis
  95. GRB 081016B: Swift/UVOT Upper Limits
  96. GRB 081011: Swift XRT refined analysis
  97. GRB 081016B: Swift-XRT Team refined Analysis
  98. GRB 081016B: Enhanced Swift-XRT position
  99. GRB 081016B: ROTSE-III Optical Limits
  100. GRB 081016B: Swift detection of a burst

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