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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"

32532 results found.

  1. GRB 081228, Swift-BAT refined analysis
  2. VLA radio detection of GRB 081221
  3. GRB 081228: Swift/UVOT Upper Limits
  4. GRB 081228: Swift-XRT Team refined analysis
  5. GRB 081228: detection by GROND
  6. VLA radio observation of GRB 081221
  7. GRB 081226B: Swift XRT and UVOT upper limits
  8. GRB 081224: Suzaku WAM observation of the prompt emission
  9. GRB 081226: Swift-XRT refined analysis
  10. GRB 081226A: Swift UVOT Upper Limits
  11. GRB 081226: Second epoch of Gemini-South imaging
  12. GRB 081226A: Swift-BAT refined analysis
  13. GRB 081226: Gemini-South imaging
  14. GRB 081226: GROND afterglow candidate
  15. GRB 081226: ROTSE-III Optical Limits
  16. GRB 080810: optical observations
  17. GRB 081211B: optical observations
  18. GRB081224: LAT retraction
  19. GRB 081224: Swift-XRT observation
  20. GRB 081222: MITSuME optical observation
  21. GRB 080810: optical observations
  22. Konus-Wind observation of GRB 081222
  23. GRB 081221: GROND observations
  24. GRB 081222: Gemini-N confirmation of redshift z=2.77
  25. GRB 081222:Optical afterglow observation
  26. VLA radio upper limit on GRB 081222
  27. GRB 081222: Fermi GBM observation
  28. GRB 081222: Gemini-South absorption redshift
  29. GRB081222: Swift/UVOT further observations
  30. GRB 081221: Probable host galaxy in Keck imaging
  31. GRB 081222, Swift-BAT refined analysis
  32. GRB 081221, Swift-BAT refined analysis
  33. Konus-Wind observation of very bright GRB 081215A
  34. GRB 081222: Swift XRT refined analysis
  35. GRB081221: Fermi GBM observation
  36. Swift/UVOT observations of GRB 081221
  37. IPN triangulation of bright GRB 081215A
  38. GRB 081221: Swift-XRT Refined Analysis
  39. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  40. GRB 081222: Faulkes Telescope South observations
  41. GRB 081221: Gemini-N nIR imaging
  42. GRB081222, optical observation
  43. GRB081222: Swift/UVOT detection of an optical afterglow
  44. GRB081203A: BTA observation
  45. Konus-Wind observation of GRB 081221
  46. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  47. GRB 081221: further NOT observations
  48. GRB 081221: NOT observations
  49. GRB 081211B: Further Swift-XRT analysis
  50. GRB 081216: Suzaku WAM observation of the prompt emission
  51. GRB 081216 : Fermi GBM observation
  52. GRB 081215A: Fermi GBM detection
  53. GRB 081211B - possibly a short burst with extended emission
  54. GRB 081118: Zadko observations
  55. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  56. GRB 081215A: Gamma Repeater?
  57. Possible GRB 081211B: Swift/UVOT Upper Limits
  58. GRB 081210: optical observations
  59. Possible GRB 081211B - Swift-XRT analysis
  60. GRB 081209: Fermi GBM detection
  61. GRB 081007: Detection of a Supernova
  62. GRB 081210: Xinglong TNT R band Upper Limits
  63. GRB 081210, SMARTS optical/IR observations
  64. GRB 081211: Swift-BAT refined analysis
  65. GRB 081211: Swift XRT refined analysis
  66. GRB 081211: Swift/UVOT detection of an optical afterglow
  67. GRB 081210: Swift/UVOT refined analysis
  68. GRB 081210: Swift-XRT refined analysis
  69. GRB081203B: optical observations
  70. GRB 081210: Swift-BAT refined analysis
  71. Konus-Wind observation of GRB 081209
  72. GRB 081203A: optical observations
  73. Radio observation of GRB 081121 with ATCA
  74. Radio observation of GRB 081118 with ATCA
  75. GRB 081128: afterglow observations
  76. GRB 081203B: Suzaku WAM observation of the prompt emission
  77. GRB 081203B: Additional Gemini imaging
  78. Radio observation of GRB 081109 with ATCA
  79. Radio observation of GRB 081104 with ATCA
  80. Radio observation of GRB 081029 with ATCA
  81. Radio observation of GRB 081008 with ATCA
  82. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  83. GRB 081203B: Gemini observations
  84. GRB 081128: optical observation in CrAO
  85. GRB081203A: Optical observations at Ishigaki
  86. GRB 081128: Optical afterglow observations
  87. GRB 081204: GROND Observations
  88. GRB081203B: optical observations
  89. Radio detection of GRB 081203B with the VLA
  90. GRB 081204: Magellan observations
  91. GRB081203A: Radio upper limit at 15 GHz
  92. GRB 081204: Swift/UVOT Upper Limits
  93. GRB 081204: Swift XRT afterglow confirmation
  94. GRB081203A: MITSuME optical observation
  95. GRB 081203A: Optical observations of Xinglong TNT telescope
  96. GRB 081203A: Skynet/GORT Detections
  97. GRB 081204: Swift XRT afterglow candidate
  98. GRB081203A: optical observation
  99. GRB 081204 : a long GRB localized by INTEGRAL
  100. VLA Radio upper limit on GRB 081203A

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