Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

28057 results found.

  1. GRB081230: Swift-XRT refined analysis
  2. GRB 081230 Swift/UVOT Observations
  3. GRB 081230: Enhanced Swift-XRT position
  4. GRB 081230: ROTSE-III Detection of Optical Counterpart
  5. GRB 081230: Swift detection of a burst
  6. GRB 081226C: Fermi GBM detection
  7. GRB 081228, Swift-BAT refined analysis
  8. VLA radio detection of GRB 081221
  9. GRB 081228: Swift/UVOT Upper Limits
  10. GRB 081228: Swift-XRT Team refined analysis
  11. GRB 081228: detection by GROND
  12. GRB 081228: Enhanced Swift-XRT position
  13. GRB 081228: TAROT Calern observatory optical observations
  14. GRB 081228: Swift detection of a burst
  15. VLA radio observation of GRB 081221
  16. GRB 081226B: Swift XRT and UVOT upper limits
  17. GRB 081224: Suzaku WAM observation of the prompt emission
  18. GRB 081226: Swift-XRT refined analysis
  19. GRB 081226A: Swift UVOT Upper Limits
  20. GRB 081226A: Swift-BAT refined analysis
  21. GRB 081226: GROND afterglow candidate
  22. GRB 081226: ROTSE-III Optical Limits
  23. GRB 081226: Swift detection of a possible short-hard burst
  24. GRB 080810: optical observations
  25. GRB 081211B: optical observations
  26. GRB 081224: Swift-XRT observation
  27. GRB 081222: MITSuME optical observation
  28. GRB 081224: Fermi GBM Detection & LAT Localization
  29. GRB 080810: optical observations
  30. Konus-Wind observation of GRB 081222
  31. GRB 081223: Fermi GBM detection
  32. GRB 081221: GROND observations
  33. VLA radio upper limit on GRB 081222
  34. GRB 081222: Fermi GBM observation
  35. GRB 081221: Probable host galaxy in Keck imaging
  36. GRB 081204C: Fermi GBM detection
  37. GRB 081222, Swift-BAT refined analysis
  38. GRB 081221, Swift-BAT refined analysis
  39. GRB081222 optical limit by "Pi of the Sky"
  40. GRB 081222: Swift XRT refined analysis
  41. GRB081221: Fermi GBM observation
  42. IPN triangulation of bright GRB 081215A
  43. GRB 081222: Faulkes Telescope South observations
  44. GRB 081221: Gemini-N nIR imaging
  45. GRB081222, optical observation
  46. GRB081203A: BTA observation
  47. Konus-Wind observation of GRB 081221
  48. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  49. GRB081222: REM candidate afterglow
  50. GRB 081222: Swift detection of a burst with a bright optical afterglow
  51. GRB 081221: Enhanced Swift-XRT position
  52. GRB 081221: further NOT observations
  53. GRB 081221: NOT observations
  54. GRB 081221: Swift detection of a burst
  55. GRB 081217: Fermi GBM detection
  56. GRB 081211B: Further Swift-XRT analysis
  57. GRB 081215B: Fermi GBM detection
  58. GRB 081216: Suzaku WAM observation of the prompt emission
  59. GRB 081216 : Fermi GBM observation
  60. GRB 081215A: Fermi GBM detection
  61. GRB 081118: Zadko observations
  62. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  63. GRB 0811215A: MASTER prompt optical observations
  64. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  65. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  66. Possible GRB 081211B: Swift/UVOT Upper Limits
  67. GRB 081213: Fermi GBM detection
  68. Possible GRB 081211B - Swift-XRT analysis
  69. GRB 081207: Fermi GBM detection
  70. GRB 081209: Fermi GBM detection
  71. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  72. GRB 081210, SMARTS optical/IR observations
  73. GRB 081211: Swift-BAT refined analysis
  74. GRB 081211: Swift XRT refined analysis
  75. GRB 081211: Enhanced Swift-XRT position
  76. GRB 081211: Swift detection of a burst
  77. GRB 081210: Swift-XRT refined analysis
  78. GRB081203B: optical observations
  79. GRB 081210: Enhanced Swift-XRT position
  80. GRB 081210: Swift-BAT refined analysis
  81. GRB 081210: Swift detection of a burst with optical afterglow
  82. IPN triangulation of short hard GRB 081209
  83. GRB 081203A: optical observations
  84. GRB 081206C: Fermi GBM detection
  85. Radio observation of GRB 081121 with ATCA
  86. Radio observation of GRB 081118 with ATCA
  87. GRB 081206B: Fermi GBM detection
  88. GRB 081206: Fermi GBM detection
  89. GRB 081128: afterglow observations
  90. GRB 081203B: Suzaku WAM observation of the prompt emission
  91. Radio observation of GRB 081109 with ATCA
  92. Radio observation of GRB 081104 with ATCA
  93. Radio observation of GRB 081029 with ATCA
  94. Radio observation of GRB 081008 with ATCA
  95. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  96. GRB081203A: Optical observations at Ishigaki
  97. GRB 081204: GROND Observations
  98. Radio detection of GRB 081203B with the VLA
  99. GRB081203A: Radio upper limit at 15 GHz
  100. GRB 081204B: 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