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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"

45294 results found.

  1. GRB081203A: BTA observation
  2. Konus-Wind observation of GRB 081221
  3. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  4. GRB081222: REM candidate afterglow
  5. GRB 081222: Swift detection of a burst with a bright optical afterglow
  6. GRB 081221: Enhanced Swift-XRT position
  7. GRB 081221: further NOT observations
  8. GRB 081221: NOT observations
  9. GRB 081221: Swift detection of a burst
  10. GRB 081217: Fermi GBM detection
  11. Modification of Swift/UVOT response to bright GRBs
  12. GRB081215A: Fermi-LAT observations
  13. GRB 081211B: Further Swift-XRT analysis
  14. GRB 081215B: Fermi GBM detection
  15. GRB 081216: Suzaku WAM observation of the prompt emission
  16. GRB 081216 : Fermi GBM observation
  17. GRB 081215A: Fermi GBM detection (correction to event fluence)
  18. GRB 081215A: Fermi GBM detection
  19. IPN localization of short hard GRB 081216
  20. GRB 081211B - possibly a short burst with extended emission
  21. GRB 081118: Zadko observations
  22. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  23. GRB 0811215A: MASTER prompt optical observations
  24. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  25. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  26. Possible GRB 081211B: Swift/UVOT Upper Limits
  27. GRB 081213: Fermi GBM detection
  28. GRB 081210: optical observations
  29. Possible GRB 081211B - Swift-XRT analysis
  30. GRB 081207: Fermi GBM detection
  31. GRB 081209: Fermi GBM detection
  32. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  33. GRB 081007: Detection of a Supernova
  34. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  35. GRB 081210: Xinglong TNT R band Upper Limits
  36. GRB 081210, SMARTS optical/IR observations
  37. GRB 081211: Swift-BAT refined analysis
  38. GRB 081211: Swift XRT refined analysis
  39. GRB 081211: Swift/UVOT detection of an optical afterglow
  40. GRB 081211: Enhanced Swift-XRT position
  41. GRB 081210: Swift/UVOT refined analysis
  42. GRB 081211: Swift detection of a burst
  43. GRB 081210: Swift-XRT refined analysis
  44. GRB081203B: optical observations
  45. GRB 081210: Enhanced Swift-XRT position
  46. GRB 081210: Swift-BAT refined analysis
  47. GRB 081210: Swift detection of a burst with optical afterglow
  48. Konus-Wind observation of GRB 081209
  49. IPN triangulation of short hard GRB 081209
  50. GRB 081203A: optical observations
  51. GRB 081206C: Fermi GBM detection
  52. Radio observation of GRB 081121 with ATCA
  53. Radio observation of GRB 081118 with ATCA
  54. GRB 081206B: Fermi GBM detection
  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 081203B: Gemini observations
  65. GRB 081128: optical observation in CrAO
  66. GRB081203A: Optical observations at Ishigaki
  67. GRB 081128: Optical afterglow observations
  68. GRB 081204: GROND Observations
  69. GRB081203B: optical observations
  70. Radio detection of GRB 081203B with the VLA
  71. GRB 081204: Magellan observations
  72. GRB081203A: Radio upper limit at 15 GHz
  73. GRB 081204B: Fermi GBM detection
  74. GRB 081204: Swift/UVOT Upper Limits
  75. GRB 081204: Swift XRT afterglow confirmation
  76. GRB081203A: MITSuME optical observation
  77. GRB 081203A: Optical observations of Xinglong TNT telescope
  78. GRB 081203A: Skynet/GORT Detections
  79. GRB 081204: Swift XRT afterglow candidate
  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. Konus-Wind observation of GRB 081203A
  85. Konus-Wind observation of GRB 081203B
  86. GRB081203A: Swift-XRT refined analysis
  87. GRB 081203B: optical observations
  88. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  89. Swift/UVOT detection of GRB081203B
  90. GRB 081203B: Swift-XRT candidate afterglow.
  91. GRB 081203A: optical observations
  92. Swift UVOT observations of GRB 081203A
  93. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  94. GRB081203A: Swift/UVOT grism redshift
  95. GRB 081203A: Burst detection from Swift-BAT slew data
  96. GRB 081203A: Swift-BAT refined analysis
  97. GRB 081203: Enhanced Swift-XRT position
  98. GRB 081130B: MASTER prompt optical observations
  99. GRB081203: optical observation
  100. GRB 081203: Swift detection of a burst with a bright optical counterpart

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