Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

27395 results found.

  1. GRB 081121: GROND observations
  2. GRB 081121: Swift-BAT refined analysis
  3. GRB081121: Swift/UVOT observations
  4. GRB 081121: ROTSE-III Detection of Optical Counterpart
  5. GRB081118 : optical upper limit
  6. GRB 081119: Fermi GBM detection
  7. VLA Radio upper limit on GRB 081118
  8. GRB 081118: Swift-XRT refined analysis
  9. GRB 081118: GROND detection of afterglow
  10. GRB 081118: optical afterglow candidate
  11. GRB 081118: Swift UVOT Upper Limits
  12. GRB 081118: Swift-BAT refined analysis
  13. GRB 081118: Enhanced Swift-XRT position
  14. GRB 081118: Swift detection of a burst
  15. GRB 081109A: confirmation of possible detection host galaxy
  16. Further Swift-XRT observations of the probable GRB 081105.
  17. GRB 081113: Fermi GBM detection
  18. GRB 081102: RTT150 Optical observations
  19. GRB 081110: Fermi GBM detection
  20. GRB 081109: TAROT La Silla observatory optical observations
  21. GRB 081102: MASTER refind and final results
  22. GRB 081109: GROND redshift limit and host extinction
  23. GRB 081025: Swift-XRT further analysis
  24. GRB 081024B: Swift-XRT late-time observations
  25. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  26. GRB 081109A, Swift-BAT refined analysis
  27. GRB 081109A: Swift-XRT refined analysis
  28. GRB 081109: Fermi GBM detection
  29. Swift-BAT Trigger 334129: possible burst
  30. GRB 081109: REM NIR afterglow detection
  31. GRB 081109: Swift detection of a burst
  32. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  33. SGR 1806-20: Fermi GBM detection
  34. GRB 081102B: Fermi GBM detection
  35. GRB 081105B: Fermi GBM detection
  36. GRB 081107: Fermi GBM detection
  37. GRB 081104: GROND found no Optical/NIR Afterglow
  38. GRB 081105: GROND Upper Limits
  39. Radio observation of GRB 080523 with ATCA
  40. Radio observation of GRB 080520 with ATCA
  41. GRB 081105: Observations from OSN
  42. Swift-XRT observations of GRB 081105
  43. GRB 081101B: Fermi GBM detection
  44. Radio observation of GRB 080516 with ATCA
  45. GRB 081105 Swift/BAT and IPN Localization
  46. GRB 081025: Fermi GBM observation
  47. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  48. GRB 081104: refined XRT analysis
  49. GRB 081104: Enhanced Swift-XRT position
  50. GRB 081104: Swift-BAT refined analysis
  51. GRB 081104 : Faulkes Telescope South observations
  52. Radio observation of GRB 080130 with ATCA
  53. GRB 081102: MASTER prompt optical limit
  54. GRB 081102: Swift-XRT refined analysis
  55. GRB 081102: Swift-BAT refined analysis
  56. GRB 081102: Enhanced Swift-XRT position
  57. Radio observation of GRB 080218b with ATCA
  58. Radio observation of GRB 080229a with ATCA
  59. GRB 081102: MASTER VWF promt observation
  60. GRB 081102: Swift detection of a burst
  61. SGR 0501+4516: optical observations in August
  62. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  63. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  64. GRB 081024B: BTA deep optical observations
  65. GRB 081024B: new Swift-XRT observations
  66. Radio observation of GRB 080229b with ATCA
  67. GRB 081024B: VLA radio observation
  68. GRB 081029: UVOT Detection of the Optical Afterglow
  69. GRB 081029: Swift-BAT refined analysis
  70. GRB081029: Swift XRT refined analysis
  71. GRB 081025: Suzaku WAM observation of the prompt emission
  72. GRB 081029: Enhanced Swift-XRT position
  73. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  74. GRB 081029: REM observations
  75. Radio observation of GRB 080303 with ATCA
  76. Radio observation of GRB 080411 with ATCA
  77. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  78. GRB 081029: ROTSE-III Detection of Optical Counterpart
  79. GRB 081028B: Fermi GBM detection
  80. GRB 081021: Fermi GBM detection
  81. Swift UVOT observations of GRB081028
  82. GRB 081028: Swift-XRT refined analysis
  83. GRB 081028, Swift-BAT refined analysis
  84. GRB 081028: Enhanced Swift-XRT position
  85. GRB 081028: TAROT Calern observatory optical observations
  86. GRB 081028: optical observations at the NOT
  87. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  88. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  89. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  90. GRB 081028: Swift detection of a burst
  91. GRB 081024: No radio detection with the VLA
  92. GRB081025: RTT150 optical observations
  93. GRB081024B: P200 Observations
  94. GRB 081024B: Swift-XRT further observations
  95. GRB 081025 BAT refined analysis
  96. Swift UVOT observations of GRB081024B
  97. Konus-Wind observation of GRB 081025
  98. GRB 081025: Swift-XRT position
  99. GRB 081024B: Swift-XRT observations
  100. GRB 081025: Burst detection from Swift-BAT slew data

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