Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

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"

19415 results found.

  1. GRB 081118: Swift UVOT Upper Limits
  2. GRB 081118: Swift-BAT refined analysis
  3. GRB 081118: Enhanced Swift-XRT position
  4. GRB 081118: Swift detection of a burst
  5. GRB 081109A: confirmation of possible detection host galaxy
  6. Further Swift-XRT observations of the probable GRB 081105.
  7. GRB 081102: RTT150 Optical observations
  8. GRB 081109: TAROT La Silla observatory optical observations
  9. GRB 081102: MASTER refind and final results
  10. GRB 081109: GROND redshift limit and host extinction
  11. GRB 081025: Swift-XRT further analysis
  12. GRB 081024B: Swift-XRT late-time observations
  13. Swift-BAT refined analysis of trigger 334129
  14. GRB 081109B: Swift/UVOT refined analysis
  15. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  16. GRB 081109A: Possible Swift-UVOT detection
  17. GRB 081109A, Swift-BAT refined analysis
  18. GRB 081109A: Swift-XRT refined analysis
  19. GRB 081109: Fermi GBM detection
  20. GRB 081109: Swift/UVOT upper limits
  21. Swift-BAT Trigger 334129: possible burst
  22. GRB 081109: Swift detection of a burst
  23. GRB 081105: GROND Upper Limits
  24. UVOT/Swift observations of GRB081105
  25. Swift-XRT observations of GRB 081105
  26. GRB 081105 Swift/BAT and IPN Localization
  27. GRB 081025: Fermi GBM observation
  28. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  29. GRB 081104: refined XRT analysis
  30. GRB 081104: Enhanced Swift-XRT position
  31. GRB 081104: Swift-BAT refined analysis
  32. GRB081104: Swift/UVOT Upper Limits
  33. Fermi Detection of GRB 081102
  34. GRB 081104: Swift-XRT position
  35. GRB 081104: Swift detection of a burst
  36. GRB 081102: MASTER prompt optical limit
  37. GRB 081102: Swift-XRT refined analysis
  38. GRB 081102: Swift/UVOT refined analysis
  39. GRB 081102: Swift-BAT refined analysis
  40. GRB 081102: Enhanced Swift-XRT position
  41. Radio observation of GRB 080218b with ATCA
  42. GRB 081102: MASTER VWF promt observation
  43. GRB 081102: Swift detection of a burst
  44. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  45. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  46. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  47. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  48. GRB 081024B: BTA deep optical observations
  49. GRB 081028: CrAO optical observations
  50. GRB 081024B: new Swift-XRT observations
  51. Radio observation of GRB 080229b with ATCA
  52. GRB 081029: UVOT Detection of the Optical Afterglow
  53. GRB 081029: Swift-BAT refined analysis
  54. GRB081029: Swift XRT refined analysis
  55. GRB 081029: Enhanced Swift-XRT position
  56. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  57. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  58. GRB 081029: ROTSE-III Detection of Optical Counterpart
  59. GRB 081029: Swift detection of a burst
  60. GRB081028: UVOT detection of a brightening afterglow
  61. Swift UVOT observations of GRB081028
  62. GRB 081028: Swift-XRT refined analysis
  63. GRB 081028, Swift-BAT refined analysis
  64. GRB 081028: Enhanced Swift-XRT position
  65. GRB 081028: TAROT Calern observatory optical observations
  66. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  67. GRB 081028: Swift detection of a burst
  68. GRB 081024: No radio detection with the VLA
  69. GRB081025: RTT150 optical observations
  70. GRB 081024B: Swift-XRT further observations
  71. GRB 081025 BAT refined analysis
  72. Swift UVOT observations of GRB081025
  73. Swift UVOT observations of GRB081024B
  74. Konus-Wind observation of GRB 081025
  75. GRB 081025: Swift-XRT position
  76. GRB 081024B: Swift-XRT observations
  77. GRB 081025: Burst detection from Swift-BAT slew data
  78. Swift UVOT observations of GRB 081024
  79. GRB 081024: Swift-XRT refined analysis
  80. GRB 081024, Swift-BAT refined analysis
  81. GRB 081024: Enhanced Swift-XRT position
  82. GRB 081024: KAIT Optical Limits
  83. GRB 081024: Early Super-LOTIS Observations
  84. GRB 081024A: ROTSE-III Optical Limits
  85. GRB 081024: Swift detection of a burst
  86. GRB 081022, Swift-BAT refined analysis
  87. GRB 081016A: Swift-XRT refined analysis
  88. GRB 081022: Swift detection of a burst
  89. GRB 081012: Swift-XRT Refined Analysis
  90. Swift trigger 332287 is not a GRB
  91. Swift detection of a possible burst (trigger 332287)
  92. GRB 081012 - Enhanced Swift XRT position
  93. GRB 081017, Swift-BAT refined analysis
  94. GRB 081017: Swift detection of a burst
  95. GRB 081016B, Swift-BAT refined analysis
  96. GRB 081016B: Swift/UVOT Upper Limits
  97. GRB 081011: Swift XRT refined analysis
  98. GRB 081016B: Swift-XRT Team refined Analysis
  99. GRB 081016B: Enhanced Swift-XRT position
  100. GRB 081016B: ROTSE-III Optical Limits

Advanced

Download all Circulars as a .tar.gz archive:
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