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"

27400 results found.

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

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