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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"

31731 results found.

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

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