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"

28098 results found.

  1. GRB 090113: Observations from NOT
  2. GRB 090113: Enhanced Swift-XRT position
  3. GRB 090113: Swift-BAT refined analysis
  4. GRB 090113: ROTSE-III Optical Limits
  5. GRB 090112B: Fermi GBM Detection
  6. GRB 090113: Swift detection of a burst
  7. GRB 090112: Fermi GBM detection
  8. GRB 090109: Fermi GBM detection
  9. GRB 090108B: Fermi GBM detection
  10. GRB 090111, Swift-BAT refined analysis
  11. GRB 090111: Swift UVOT Upper Limits
  12. GRB 090108: Fermi GBM Detection
  13. GRB 090111: Swift-XRT refined analysis
  14. GRB 090111: Enhanced Swift-XRT position
  15. GRB 090111: Swift detection of a burst
  16. GRB 090107B: Suzaku WAM observation of the prompt emission
  17. GRB090107B: Fermi GBM Detection
  18. GRB 090107B: Swift XRT afterglow confirmation
  19. GRB 090107B: Swift/UVOT Observations
  20. GRB 090107B: Swift-XRT detection of possible afterglow
  21. GRB 090107B: a long GRB localized by INTEGRAL
  22. Fermi/GBM detection of GRB 081226A
  23. Fermi/GBM detection of GRB 081225
  24. GRB 090107: Swift-BAT refined analysis
  25. GRB 081231: Fermi GBM Detection
  26. VLA radio upper limit on GRB 090102
  27. GRB 090102: GRT Optical Observation
  28. Swift triggered on the HMXB 1A 1118-61
  29. GRB 081229: Fermi GBM detection
  30. GRB 090102: P60 Imaging and P200 Spectroscopy
  31. GRB 090102 Observations from IAC80
  32. GRB 090102: GROND observations of the optical afterglow
  33. GRB 090102: Swift-BAT refined analysis
  34. GRB 090102: Swift XRT refined analysis
  35. GRB 090102: NOT redshift
  36. GRB 090102: Enhanced Swift-XRT position
  37. GRB 090102: REM observations of a bright afterglow
  38. GRB 090102: Swift detection of a burst with an optical counterpart
  39. GRB 090102: TAROT Calern observatory optical observations
  40. GRB 081230: GROND confirmation of the afterglow
  41. GRB 081230, Swift-BAT refined analysis
  42. GRB081230: Swift-XRT refined analysis
  43. GRB 081230 Swift/UVOT Observations
  44. GRB 081230: Enhanced Swift-XRT position
  45. GRB 081230: ROTSE-III Detection of Optical Counterpart
  46. GRB 081230: Swift detection of a burst
  47. GRB 081226C: Fermi GBM detection
  48. GRB 081228, Swift-BAT refined analysis
  49. VLA radio detection of GRB 081221
  50. GRB 081228: Swift/UVOT Upper Limits
  51. GRB 081228: Swift-XRT Team refined analysis
  52. GRB 081228: detection by GROND
  53. GRB 081228: Enhanced Swift-XRT position
  54. GRB 081228: TAROT Calern observatory optical observations
  55. GRB 081228: Swift detection of a burst
  56. VLA radio observation of GRB 081221
  57. GRB 081226B: Swift XRT and UVOT upper limits
  58. GRB 081224: Suzaku WAM observation of the prompt emission
  59. GRB 081226: Swift-XRT refined analysis
  60. GRB 081226A: Swift UVOT Upper Limits
  61. GRB 081226A: Swift-BAT refined analysis
  62. GRB 081226: GROND afterglow candidate
  63. GRB 081226: ROTSE-III Optical Limits
  64. GRB 081226: Swift detection of a possible short-hard burst
  65. GRB 080810: optical observations
  66. GRB 081211B: optical observations
  67. GRB 081224: Swift-XRT observation
  68. GRB 081222: MITSuME optical observation
  69. GRB 081224: Fermi GBM Detection & LAT Localization
  70. GRB 080810: optical observations
  71. Konus-Wind observation of GRB 081222
  72. GRB 081223: Fermi GBM detection
  73. GRB 081221: GROND observations
  74. VLA radio upper limit on GRB 081222
  75. GRB 081222: Fermi GBM observation
  76. GRB 081221: Probable host galaxy in Keck imaging
  77. GRB 081204C: Fermi GBM detection
  78. GRB 081222, Swift-BAT refined analysis
  79. GRB 081221, Swift-BAT refined analysis
  80. GRB081222 optical limit by "Pi of the Sky"
  81. GRB 081222: Swift XRT refined analysis
  82. GRB081221: Fermi GBM observation
  83. IPN triangulation of bright GRB 081215A
  84. GRB 081222: Faulkes Telescope South observations
  85. GRB 081221: Gemini-N nIR imaging
  86. GRB081222, optical observation
  87. GRB081203A: BTA observation
  88. Konus-Wind observation of GRB 081221
  89. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  90. GRB081222: REM candidate afterglow
  91. GRB 081222: Swift detection of a burst with a bright optical afterglow
  92. GRB 081221: Enhanced Swift-XRT position
  93. GRB 081221: further NOT observations
  94. GRB 081221: NOT observations
  95. GRB 081221: Swift detection of a burst
  96. GRB 081217: Fermi GBM detection
  97. GRB 081211B: Further Swift-XRT analysis
  98. GRB 081215B: Fermi GBM detection
  99. GRB 081216: Suzaku WAM observation of the prompt emission
  100. GRB 081216 : Fermi GBM observation

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