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"

21815 results found.

  1. GRB 081203A: optical observations
  2. GRB 081128: afterglow observations
  3. GRB 081203B: Suzaku WAM observation of the prompt emission
  4. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  5. GRB081203A: Optical observations at Ishigaki
  6. GRB 081128: Optical afterglow observations
  7. GRB 081204: GROND Observations
  8. Radio detection of GRB 081203B with the VLA
  9. GRB081203A: Radio upper limit at 15 GHz
  10. GRB 081204: Swift/UVOT Upper Limits
  11. GRB081203A: MITSuME optical observation
  12. GRB081203A: optical observation
  13. VLA Radio upper limit on GRB 081203A
  14. Konus-Wind observation of GRB 081203A
  15. Konus-Wind observation of GRB 081203B
  16. GRB 081203B: optical observations
  17. Swift/UVOT detection of GRB081203B
  18. GRB 081203B: Swift-XRT candidate afterglow.
  19. GRB 081203A: optical observations
  20. GRB 081203: Enhanced Swift-XRT position
  21. GRB 081130B: MASTER prompt optical observations
  22. GRB081203: optical observation
  23. GRB 081203: Swift detection of a burst with a bright optical counterpart
  24. Swift Trigger 335971: Swift/UVOT Observations
  25. GRB 081126: afterglow photometry
  26. VLA Radio upper limit on GRB 081126
  27. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  28. GRB 081128A: optical observations
  29. Trigger 335971: Swift possible detection of a burst
  30. GRB081128: Swift/UVOT Upper Limits
  31. GRB 081128: Swift-XRT refined analysis
  32. GRB 081128: Liverpool Telescope afterglow confirmation
  33. GRB081128: optical observations
  34. GRB 081128: Enhanced Swift-XRT position
  35. GRB 081128: Optical observation of xinglong TNT
  36. GRB 081128: Swift detection of a burst
  37. GRB081126: Afterglow photometry from Crni Vrh
  38. GRB 081126: GRT Optical Observation
  39. GRB 081127: Swift/UVOT Upper Limits
  40. GRB 081127: Enhanced Swift-XRT position
  41. GRB 081126: Swift-XRT refined analysis
  42. GRB 081127: Swift detection of a burst
  43. GRB 081126: Swift/UVOT Observations
  44. GRB 081126: optical observations
  45. GRB 081126: Enhanced Swift-XRT position
  46. GRB 081126: TAROT Calern observatory optical observations
  47. GRB 081126: Swift detection of a burst
  48. GRB 081120: Fermi GBM detection
  49. GRB 081122: Fermi GBM detection
  50. Konus-Wind observation of GRB 081121
  51. GRB 081121, SMARTS optical/IR afterglow observations
  52. GRB081121: Refined Swift/UVOT observations
  53. GRB 081121: Swift-XRT refined analysis
  54. GRB 081121: Enhanced Swift-XRT position
  55. GRB 081121: GROND observations
  56. GRB 081121: Swift-BAT refined analysis
  57. GRB081121: Swift/UVOT observations
  58. GRB081118 : optical upper limit
  59. VLA Radio upper limit on GRB 081118
  60. GRB 081118: Swift-XRT refined analysis
  61. GRB 081118: GROND detection of afterglow
  62. GRB 081118: optical afterglow candidate
  63. GRB 081118: Swift UVOT Upper Limits
  64. GRB 081118: Enhanced Swift-XRT position
  65. GRB 081118: Swift detection of a burst
  66. GRB 081109A: confirmation of possible detection host galaxy
  67. Further Swift-XRT observations of the probable GRB 081105.
  68. GRB 081102: RTT150 Optical observations
  69. GRB 081110: Fermi GBM detection
  70. GRB 081109: TAROT La Silla observatory optical observations
  71. GRB 081102: MASTER refind and final results
  72. GRB 081109: GROND redshift limit and host extinction
  73. GRB 081025: Swift-XRT further analysis
  74. GRB 081024B: Swift-XRT late-time observations
  75. GRB 081109B: Swift/UVOT refined analysis
  76. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  77. GRB 081109A, Swift-BAT refined analysis
  78. GRB 081109A: Swift-XRT refined analysis
  79. Swift-BAT Trigger 334129: possible burst
  80. GRB 081109: REM NIR afterglow detection
  81. GRB 081109: Swift detection of a burst
  82. SGR 1806-20: Fermi GBM detection
  83. GRB 081104: GROND found no Optical/NIR Afterglow
  84. GRB 081105: GROND Upper Limits
  85. Radio observation of GRB 080523 with ATCA
  86. Radio observation of GRB 080520 with ATCA
  87. GRB 081105: Observations from OSN
  88. Swift-XRT observations of GRB 081105
  89. GRB 081101B: Fermi GBM detection
  90. Radio observation of GRB 080516 with ATCA
  91. GRB 081105 Swift/BAT and IPN Localization
  92. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  93. GRB 081104: refined XRT analysis
  94. GRB 081104: Enhanced Swift-XRT position
  95. GRB081104: Swift/UVOT Upper Limits
  96. GRB 081104 : Faulkes Telescope South observations
  97. Radio observation of GRB 080130 with ATCA
  98. GRB 081102: MASTER prompt optical limit
  99. GRB 081102: Swift-XRT refined analysis
  100. GRB 081102: Swift/UVOT refined analysis

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