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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"
  1. IPN triangulation of bright GRB 081215A
  2. GRB 081221: Swift-XRT Refined Analysis
  3. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  4. GRB 081222: Faulkes Telescope South observations
  5. GRB 081221: Gemini-N nIR imaging
  6. GRB081222, optical observation
  7. GRB081222: Swift/UVOT detection of an optical afterglow
  8. GRB081203A: BTA observation
  9. Konus-Wind observation of GRB 081221
  10. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  11. GRB081222: REM candidate afterglow
  12. GRB 081222: Swift detection of a burst with a bright optical afterglow
  13. GRB 081221: Enhanced Swift-XRT position
  14. GRB 081221: further NOT observations
  15. GRB 081221: NOT observations
  16. GRB 081221: Swift detection of a burst
  17. GRB 081217: Fermi GBM detection
  18. Modification of Swift/UVOT response to bright GRBs
  19. GRB081215A: Fermi-LAT observations
  20. GRB 081211B: Further Swift-XRT analysis
  21. GRB 081215B: Fermi GBM detection
  22. GRB 081216: Suzaku WAM observation of the prompt emission
  23. GRB 081216 : Fermi GBM observation
  24. GRB 081215A: Fermi GBM detection (correction to event fluence)
  25. GRB 081215A: Fermi GBM detection
  26. IPN localization of short hard GRB 081216
  27. GRB 081211B - possibly a short burst with extended emission
  28. GRB 081118: Zadko observations
  29. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  30. GRB 081215A: Gamma Repeater?
  31. GRB 0811215A: MASTER prompt optical observations
  32. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  33. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  34. Possible GRB 081211B: Swift/UVOT Upper Limits
  35. GRB 081213: Fermi GBM detection
  36. GRB 081210: optical observations
  37. Possible GRB 081211B - Swift-XRT analysis
  38. GRB 081207: Fermi GBM detection
  39. GRB 081209: Fermi GBM detection
  40. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  41. GRB 081007: Detection of a Supernova
  42. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  43. GRB 081210: Xinglong TNT R band Upper Limits
  44. GRB 081210, SMARTS optical/IR observations
  45. GRB 081211: Swift-BAT refined analysis
  46. GRB 081211: Swift XRT refined analysis
  47. GRB 081211: Swift/UVOT detection of an optical afterglow
  48. GRB 081211: Enhanced Swift-XRT position
  49. GRB 081210: Swift/UVOT refined analysis
  50. GRB 081211: Swift detection of a burst
  51. GRB 081210: Swift-XRT refined analysis
  52. GRB081203B: optical observations
  53. GRB 081210: Enhanced Swift-XRT position
  54. GRB 081210: Swift-BAT refined analysis
  55. GRB 081210: Swift detection of a burst with optical afterglow
  56. Konus-Wind observation of GRB 081209
  57. IPN triangulation of short hard GRB 081209
  58. GRB 081203A: optical observations
  59. GRB 081206C: Fermi GBM detection
  60. Radio observation of GRB 081121 with ATCA
  61. Radio observation of GRB 081118 with ATCA
  62. GRB 081206B: Fermi GBM detection
  63. GRB 081206: Fermi GBM detection
  64. GRB 081128: afterglow observations
  65. GRB 081203B: Suzaku WAM observation of the prompt emission
  66. GRB 081203B: Additional Gemini imaging
  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. GRB 081203B: Gemini observations
  73. GRB 081128: optical observation in CrAO
  74. GRB081203A: Optical observations at Ishigaki
  75. GRB 081128: Optical afterglow observations
  76. GRB 081204: GROND Observations
  77. GRB081203B: optical observations
  78. Radio detection of GRB 081203B with the VLA
  79. GRB 081204: Magellan observations
  80. GRB081203A: Radio upper limit at 15 GHz
  81. GRB 081204B: Fermi GBM detection
  82. GRB 081204: Swift/UVOT Upper Limits
  83. GRB 081204: Swift XRT afterglow confirmation
  84. GRB081203A: MITSuME optical observation
  85. GRB 081203A: Optical observations of Xinglong TNT telescope
  86. GRB 081203A: Skynet/GORT Detections
  87. GRB 081204: Swift XRT afterglow candidate
  88. GRB081203A: optical observation
  89. GRB 081204 : a long GRB localized by INTEGRAL
  90. VLA Radio upper limit on GRB 081203A
  91. Swift-XRT observations of GRB 081203B
  92. Konus-Wind observation of GRB 081203A
  93. Konus-Wind observation of GRB 081203B
  94. GRB081203A: Swift-XRT refined analysis
  95. GRB 081203B: optical observations
  96. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  97. Swift/UVOT detection of GRB081203B
  98. GRB 081203B: Swift-XRT candidate afterglow.
  99. GRB 081203A: optical observations
  100. Swift UVOT observations of GRB 081203A

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