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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"

31730 results found.

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

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