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"

28233 results found.

  1. GRB 081211B: optical observations
  2. GRB 081224: Swift-XRT observation
  3. GRB 081222: MITSuME optical observation
  4. GRB 081224: Fermi GBM Detection & LAT Localization
  5. GRB 080810: optical observations
  6. Konus-Wind observation of GRB 081222
  7. GRB 081223: Fermi GBM detection
  8. GRB 081221: GROND observations
  9. VLA radio upper limit on GRB 081222
  10. GRB 081222: Fermi GBM observation
  11. GRB 081221: Probable host galaxy in Keck imaging
  12. GRB 081204C: Fermi GBM detection
  13. GRB 081222, Swift-BAT refined analysis
  14. GRB 081221, Swift-BAT refined analysis
  15. GRB081222 optical limit by "Pi of the Sky"
  16. GRB 081222: Swift XRT refined analysis
  17. GRB081221: Fermi GBM observation
  18. IPN triangulation of bright GRB 081215A
  19. GRB 081222: Faulkes Telescope South observations
  20. GRB 081221: Gemini-N nIR imaging
  21. GRB081222, optical observation
  22. GRB081203A: BTA observation
  23. Konus-Wind observation of GRB 081221
  24. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  25. GRB081222: REM candidate afterglow
  26. GRB 081222: Swift detection of a burst with a bright optical afterglow
  27. GRB 081221: Enhanced Swift-XRT position
  28. GRB 081221: further NOT observations
  29. GRB 081221: NOT observations
  30. GRB 081221: Swift detection of a burst
  31. GRB 081217: Fermi GBM detection
  32. GRB 081211B: Further Swift-XRT analysis
  33. GRB 081215B: Fermi GBM detection
  34. GRB 081216: Suzaku WAM observation of the prompt emission
  35. GRB 081216 : Fermi GBM observation
  36. GRB 081215A: Fermi GBM detection
  37. GRB 081118: Zadko observations
  38. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  39. GRB 0811215A: MASTER prompt optical observations
  40. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  41. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  42. Possible GRB 081211B: Swift/UVOT Upper Limits
  43. GRB 081213: Fermi GBM detection
  44. Possible GRB 081211B - Swift-XRT analysis
  45. GRB 081207: Fermi GBM detection
  46. GRB 081209: Fermi GBM detection
  47. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  48. GRB 081210, SMARTS optical/IR observations
  49. GRB 081211: Swift-BAT refined analysis
  50. GRB 081211: Swift XRT refined analysis
  51. GRB 081211: Enhanced Swift-XRT position
  52. GRB 081211: Swift detection of a burst
  53. GRB 081210: Swift-XRT refined analysis
  54. GRB081203B: optical observations
  55. GRB 081210: Enhanced Swift-XRT position
  56. GRB 081210: Swift-BAT refined analysis
  57. GRB 081210: Swift detection of a burst with optical afterglow
  58. IPN triangulation of short hard GRB 081209
  59. GRB 081203A: optical observations
  60. GRB 081206C: Fermi GBM detection
  61. Radio observation of GRB 081121 with ATCA
  62. Radio observation of GRB 081118 with ATCA
  63. GRB 081206B: Fermi GBM detection
  64. GRB 081206: Fermi GBM detection
  65. GRB 081128: afterglow observations
  66. GRB 081203B: Suzaku WAM observation of the prompt emission
  67. Radio observation of GRB 081109 with ATCA
  68. Radio observation of GRB 081104 with ATCA
  69. Radio observation of GRB 081029 with ATCA
  70. Radio observation of GRB 081008 with ATCA
  71. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  72. GRB081203A: Optical observations at Ishigaki
  73. GRB 081204: GROND Observations
  74. Radio detection of GRB 081203B with the VLA
  75. GRB081203A: Radio upper limit at 15 GHz
  76. GRB 081204B: Fermi GBM detection
  77. GRB 081204: Swift/UVOT Upper Limits
  78. GRB 081204: Swift XRT afterglow confirmation
  79. GRB081203A: MITSuME optical observation
  80. GRB081203A: optical observation
  81. GRB 081204 : a long GRB localized by INTEGRAL
  82. VLA Radio upper limit on GRB 081203A
  83. Swift-XRT observations of GRB 081203B
  84. GRB081203A: Swift-XRT refined analysis
  85. GRB 081203B: optical observations
  86. Swift/UVOT detection of GRB081203B
  87. GRB 081203B: Swift-XRT candidate afterglow.
  88. GRB 081203A: optical observations
  89. GRB081203A: Swift/UVOT grism redshift
  90. GRB 081203A: Burst detection from Swift-BAT slew data
  91. GRB 081203A: Swift-BAT refined analysis
  92. GRB 081203: Enhanced Swift-XRT position
  93. GRB 081130B: MASTER prompt optical observations
  94. GRB081203: optical observation
  95. GRB 081203: Swift detection of a burst with a bright optical counterpart
  96. GRB 081130B: Fermi GBM detection
  97. GRB 081130: Fermi GBM detection
  98. Swift Trigger 335971: Swift/UVOT Observations
  99. GRB 081126: afterglow photometry
  100. GRB 081126: 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