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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"

25577 results found.

  1. GRB 081226A: Swift-BAT refined analysis
  2. GRB 081226B: a short-hard GRB detected by INTEGRAL
  3. GRB 081226: Gemini-South imaging
  4. GRB 081226: Swift detection of a possible short-hard burst
  5. GRB 080810: optical observations
  6. GRB 080810: optical observations
  7. Konus-Wind observation of GRB 081222
  8. GRB 081223: Fermi GBM detection
  9. GRB 081221: GROND observations
  10. GRB 081222:Optical afterglow observation
  11. VLA radio upper limit on GRB 081222
  12. GRB 081222: Fermi GBM observation
  13. GRB 081221: Probable host galaxy in Keck imaging
  14. GRB 081204C: Fermi GBM detection
  15. GRB 081222, Swift-BAT refined analysis
  16. GRB 081221, Swift-BAT refined analysis
  17. GRB081222 optical limit by "Pi of the Sky"
  18. Konus-Wind observation of very bright GRB 081215A
  19. GRB 081222: Swift XRT refined analysis
  20. GRB081221: Fermi GBM observation
  21. GRB 081221: Swift-XRT Refined Analysis
  22. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  23. GRB 081222: Faulkes Telescope South observations
  24. Konus-Wind observation of GRB 081221
  25. GRB 081222: GROND Detection of the Optical/NIR 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: Swift detection of a burst
  30. GRB 081217: Fermi GBM detection
  31. GRB081215A: Fermi-LAT observations
  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 081211B - possibly a short burst with extended emission
  38. GRB 081118: Zadko observations
  39. GRB 081207: Fermi GBM detection
  40. GRB 081209: Fermi GBM detection
  41. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  42. GRB 081007: Detection of a Supernova
  43. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  44. GRB 081211: Swift-BAT refined analysis
  45. GRB 081211: Enhanced Swift-XRT position
  46. GRB 081211: Swift detection of a burst
  47. GRB 081210: Swift-XRT refined analysis
  48. GRB 081210: Enhanced Swift-XRT position
  49. GRB 081210: Swift-BAT refined analysis
  50. GRB 081210: Swift detection of a burst with optical afterglow
  51. Konus-Wind observation of GRB 081209
  52. GRB 081206C: Fermi GBM detection
  53. Radio observation of GRB 081121 with ATCA
  54. Radio observation of GRB 081118 with ATCA
  55. GRB 081206: Fermi GBM detection
  56. GRB 081128: afterglow observations
  57. GRB 081203B: Suzaku WAM observation of the prompt emission
  58. GRB 081203B: Additional Gemini imaging
  59. Radio observation of GRB 081109 with ATCA
  60. Radio observation of GRB 081104 with ATCA
  61. Radio observation of GRB 081029 with ATCA
  62. Radio observation of GRB 081008 with ATCA
  63. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  64. GRB 081128: Optical afterglow observations
  65. GRB 081204: GROND Observations
  66. Radio detection of GRB 081203B with the VLA
  67. GRB 081204B: Fermi GBM detection
  68. GRB 081204 : a long GRB localized by INTEGRAL
  69. VLA Radio upper limit on GRB 081203A
  70. Swift-XRT observations of GRB 081203B
  71. Konus-Wind observation of GRB 081203A
  72. Konus-Wind observation of GRB 081203B
  73. GRB081203A: Swift-XRT refined analysis
  74. GRB 081203B: optical observations
  75. GRB 081203A: optical observations
  76. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  77. GRB 081203A: Burst detection from Swift-BAT slew data
  78. GRB 081203A: Swift-BAT refined analysis
  79. GRB 081203: Enhanced Swift-XRT position
  80. GRB 081130B: MASTER prompt optical observations
  81. GRB081203: optical observation
  82. GRB 081203: Swift detection of a burst with a bright optical counterpart
  83. GRB 081130B: Fermi GBM detection
  84. GRB 081126: Fermi GBM detection
  85. VLA Radio upper limit on GRB 081126
  86. GRB 081129: Fermi GBM detection
  87. GRB 081128A: optical observations
  88. GRB 081122B: Fermi GBM Detection
  89. GRB 081128: Swift-XRT refined analysis
  90. GRB 081128: Liverpool Telescope afterglow confirmation
  91. GRB081128: optical observations
  92. GRB081128 : Lulin optical follow-ups
  93. GRB 081128: Swift-BAT refined analysis
  94. GRB 081128: Enhanced Swift-XRT position
  95. GRB 081128: Swift detection of a burst
  96. GRB081126: Afterglow photometry from Crni Vrh
  97. GRB 081126: GRT Optical Observation
  98. GRB 081127: Swift/UVOT Upper Limits
  99. GRB 081127: Swift-XRT refined analysis
  100. GRB 081127: Enhanced Swift-XRT position

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