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"

21526 results found.

  1. GRB 090102: TAROT Calern observatory optical observations
  2. GRB 081230: GROND confirmation of the afterglow
  3. GRB 081230, Swift-BAT refined analysis
  4. GRB081230: Swift-XRT refined analysis
  5. GRB 081230 Swift/UVOT Observations
  6. GRB 081230: Enhanced Swift-XRT position
  7. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  8. GRB 081230: ROTSE-III Detection of Optical Counterpart
  9. GRB 081230: Swift detection of a burst
  10. GRB 081228: GROND confirmation of the optical/NIR afterglow
  11. GRB 081228, Swift-BAT refined analysis
  12. GRB 081228: Swift/UVOT Upper Limits
  13. GRB 081228: Swift-XRT Team refined analysis
  14. GRB 081228: detection by GROND
  15. GRB 081228: Enhanced Swift-XRT position
  16. GRB 081228: TAROT Calern observatory optical observations
  17. GRB 081228: Swift detection of a burst
  18. GRB 081226B: Swift XRT and UVOT upper limits
  19. GRB 081226: Swift-XRT refined analysis
  20. GRB 081226A: Swift UVOT Upper Limits
  21. GRB 081226: Second epoch of Gemini-South imaging
  22. GRB 081226A: Swift-BAT refined analysis
  23. GRB 081226: Gemini-South imaging
  24. GRB 081226: GROND afterglow candidate
  25. GRB 081226: ROTSE-III Optical Limits
  26. GRB 081226: Swift detection of a possible short-hard burst
  27. GRB 081211B: optical observations
  28. GRB 081224: Swift-XRT observation
  29. Konus-Wind observation of GRB 081222
  30. GRB 081221: GROND observations
  31. GRB 081222:Optical afterglow observation
  32. GRB 081222: Fermi GBM observation
  33. GRB081222: Swift/UVOT further observations
  34. GRB 081221: Probable host galaxy in Keck imaging
  35. GRB 081222, Swift-BAT refined analysis
  36. GRB 081221, Swift-BAT refined analysis
  37. GRB081222 optical limit by "Pi of the Sky"
  38. GRB 081222: Swift XRT refined analysis
  39. GRB081221: Fermi GBM observation
  40. Swift/UVOT observations of GRB 081221
  41. IPN triangulation of bright GRB 081215A
  42. GRB 081221: Swift-XRT Refined Analysis
  43. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  44. GRB 081221: Gemini-N nIR imaging
  45. GRB081222, optical observation
  46. GRB081222: Swift/UVOT detection of an optical afterglow
  47. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  48. GRB081222: REM candidate afterglow
  49. GRB 081222: Swift detection of a burst with a bright optical afterglow
  50. GRB 081221: Enhanced Swift-XRT position
  51. GRB 081221: further NOT observations
  52. GRB 081221: NOT observations
  53. GRB 081221: Swift detection of a burst
  54. Modification of Swift/UVOT response to bright GRBs
  55. GRB 081211B: Further Swift-XRT analysis
  56. GRB 081211B - possibly a short burst with extended emission
  57. GRB 081118: Zadko observations
  58. Possible GRB 081211B: Swift/UVOT Upper Limits
  59. GRB 081210: optical observations
  60. Possible GRB 081211B - Swift-XRT analysis
  61. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  62. GRB 081211: Swift-BAT refined analysis
  63. GRB 081211: Swift XRT refined analysis
  64. GRB 081211: Swift/UVOT detection of an optical afterglow
  65. GRB 081211: Enhanced Swift-XRT position
  66. GRB 081210: Swift/UVOT refined analysis
  67. GRB 081211: Swift detection of a burst
  68. GRB 081210: Swift-XRT refined analysis
  69. GRB 081210: Enhanced Swift-XRT position
  70. GRB 081210: Swift-BAT refined analysis
  71. GRB 081210: Swift detection of a burst with optical afterglow
  72. IPN triangulation of short hard GRB 081209
  73. Radio observation of GRB 081121 with ATCA
  74. GRB 081128: afterglow observations
  75. GRB 081203B: Suzaku WAM observation of the prompt emission
  76. Radio observation of GRB 081029 with ATCA
  77. Radio observation of GRB 081008 with ATCA
  78. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  79. GRB 081128: optical observation in CrAO
  80. GRB 081128: Optical afterglow observations
  81. GRB 081204: GROND Observations
  82. GRB 081204: Magellan observations
  83. GRB 081204: Swift/UVOT Upper Limits
  84. GRB 081204: Swift XRT afterglow confirmation
  85. GRB 081204: Swift XRT afterglow candidate
  86. Swift-XRT observations of GRB 081203B
  87. Konus-Wind observation of GRB 081203A
  88. Konus-Wind observation of GRB 081203B
  89. GRB081203A: Swift-XRT refined analysis
  90. GRB 081203B: optical observations
  91. Swift/UVOT detection of GRB081203B
  92. GRB 081203B: Swift-XRT candidate afterglow.
  93. GRB 081203A: optical observations
  94. Swift UVOT observations of GRB 081203A
  95. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  96. GRB081203A: Swift/UVOT grism redshift
  97. GRB 081203A: Burst detection from Swift-BAT slew data
  98. GRB 081203A: Swift-BAT refined analysis
  99. GRB 081203: Enhanced Swift-XRT position
  100. GRB081203: optical 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