Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

28302 results found.

  1. GRB 081211B: Further Swift-XRT analysis
  2. GRB 081215B: Fermi GBM detection
  3. GRB 081216: Suzaku WAM observation of the prompt emission
  4. GRB 081216 : Fermi GBM observation
  5. GRB 081215A: Fermi GBM detection
  6. GRB 081118: Zadko observations
  7. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  8. GRB 0811215A: MASTER prompt optical observations
  9. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  10. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  11. Possible GRB 081211B: Swift/UVOT Upper Limits
  12. GRB 081213: Fermi GBM detection
  13. Possible GRB 081211B - Swift-XRT analysis
  14. GRB 081207: Fermi GBM detection
  15. GRB 081209: Fermi GBM detection
  16. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  17. GRB 081210, SMARTS optical/IR observations
  18. GRB 081211: Swift-BAT refined analysis
  19. GRB 081211: Swift XRT refined analysis
  20. GRB 081211: Enhanced Swift-XRT position
  21. GRB 081211: Swift detection of a burst
  22. GRB 081210: Swift-XRT refined analysis
  23. GRB081203B: optical observations
  24. GRB 081210: Enhanced Swift-XRT position
  25. GRB 081210: Swift-BAT refined analysis
  26. GRB 081210: Swift detection of a burst with optical afterglow
  27. IPN triangulation of short hard GRB 081209
  28. GRB 081203A: optical observations
  29. GRB 081206C: Fermi GBM detection
  30. Radio observation of GRB 081121 with ATCA
  31. Radio observation of GRB 081118 with ATCA
  32. GRB 081206B: Fermi GBM detection
  33. GRB 081206: Fermi GBM detection
  34. GRB 081128: afterglow observations
  35. GRB 081203B: Suzaku WAM observation of the prompt emission
  36. Radio observation of GRB 081109 with ATCA
  37. Radio observation of GRB 081104 with ATCA
  38. Radio observation of GRB 081029 with ATCA
  39. Radio observation of GRB 081008 with ATCA
  40. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  41. GRB081203A: Optical observations at Ishigaki
  42. GRB 081204: GROND Observations
  43. Radio detection of GRB 081203B with the VLA
  44. GRB081203A: Radio upper limit at 15 GHz
  45. GRB 081204B: Fermi GBM detection
  46. GRB 081204: Swift/UVOT Upper Limits
  47. GRB 081204: Swift XRT afterglow confirmation
  48. GRB081203A: MITSuME optical observation
  49. GRB081203A: optical observation
  50. GRB 081204 : a long GRB localized by INTEGRAL
  51. VLA Radio upper limit on GRB 081203A
  52. Swift-XRT observations of GRB 081203B
  53. GRB081203A: Swift-XRT refined analysis
  54. GRB 081203B: optical observations
  55. Swift/UVOT detection of GRB081203B
  56. GRB 081203B: Swift-XRT candidate afterglow.
  57. GRB 081203A: optical observations
  58. GRB081203A: Swift/UVOT grism redshift
  59. GRB 081203A: Burst detection from Swift-BAT slew data
  60. GRB 081203A: Swift-BAT refined analysis
  61. GRB 081203: Enhanced Swift-XRT position
  62. GRB 081130B: MASTER prompt optical observations
  63. GRB081203: optical observation
  64. GRB 081203: Swift detection of a burst with a bright optical counterpart
  65. GRB 081130B: Fermi GBM detection
  66. GRB 081130: Fermi GBM detection
  67. Swift Trigger 335971: Swift/UVOT Observations
  68. GRB 081126: afterglow photometry
  69. GRB 081126: Fermi GBM detection
  70. VLA Radio upper limit on GRB 081126
  71. GRB 081129: Fermi GBM detection
  72. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  73. GRB 081128A: optical observations
  74. Trigger 335971: Swift possible detection of a burst
  75. GRB081128: Swift/UVOT Upper Limits
  76. GRB 081122B: Fermi GBM Detection
  77. GRB 081128: Swift-XRT refined analysis
  78. GRB 081128: Liverpool Telescope afterglow confirmation
  79. GRB081128: optical observations
  80. GRB 081128: Swift-BAT refined analysis
  81. GRB 081128: Enhanced Swift-XRT position
  82. GRB 081128: Optical observation of xinglong TNT
  83. GRB 081128: Swift detection of a burst
  84. GRB081126: Afterglow photometry from Crni Vrh
  85. GRB 081126: GRT Optical Observation
  86. GRB 081127: Swift/UVOT Upper Limits
  87. GRB 081127: Swift-XRT refined analysis
  88. GRB 081127: Enhanced Swift-XRT position
  89. GRB 081127: Swift-BAT refined analysis
  90. GRB 081126: Swift-XRT refined analysis
  91. GRB 081127: Swift detection of a burst
  92. GRB 081126: Swift/UVOT Observations
  93. GRB 081126: optical observations
  94. GRB 081126: Swift-BAT refined analysis
  95. GRB 081126: Enhanced Swift-XRT position
  96. GRB 081126: TAROT Calern observatory optical observations
  97. GRB 081126: Swift detection of a burst
  98. GRB 081125: Fermi GBM detection
  99. GRB 081124: Fermi GBM detection
  100. GRB 081120: Fermi GBM detection

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