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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

37713 results found.

  1. GRB 170711A: Swift detection of a burst
  2. GRB 170705A: TShAO optical observations
  3. GRB 170710B: Fermi GBM observation
  4. GRB 170710B: Swift-XRT and UVOT observations
  5. GRB 170710B: Swift ToO observations
  6. GRB 170710B: Swift detection of a burst
  7. GRB170710A: Swift/UVOT detection
  8. IPN Triangulation of GRB 170708A (short)
  9. GRB 170710A: Swift-BAT refined analysis
  10. GRB 170710A: Swift-XRT refined Analysis
  11. GRB 170710A: Gemini-S candidate counterpart
  12. GRB 170710A: Enhanced Swift-XRT position
  13. GRB 170710A: Prompt enhanced Swift-XRT position
  14. GRB 170710A: Swift detection of a burst
  15. GRB 170708A: Insight-HXMT detection
  16. LIGO/Virgo G288732: Konus-Wind observations
  17. GRB 170705A: Further RATIR Optical and NIR Observations and Steepening of Fading
  18. GRB 170705A: KAIT Optical Observations
  19. GRB 170705A: Insight-HXMT observation
  20. GRB 170705A: ISON/Terskol optical observations
  21. Konus-Wind observation of GRB 170705A
  22. GRB 170705A: Redshift from 10.4m GTC/OSIRIS
  23. GRB 170705A: Fermi GBM observation
  24. GRB 170705A: Swift-BAT refined analysis
  25. GRB 170705A: MITSuME Akeno Optical Observation
  26. GRB 170705A: Swift/UVOT Detection
  27. GRB 170705A: RATIR Optical and NIR Observations
  28. GRB 170705A: Swift-XRT refined Analysis
  29. GRB 170705A: MASTER-OAFA early OT observations
  30. GRB 170705A: Enhanced Swift-XRT position
  31. GRB 170705A: Swift detection of a burst with an optical counterpart
  32. GRB 170629A: Swift-XRT refined Analysis
  33. GRB 170629A: Swift-BAT refined analysis
  34. GRB 170629A: Enhanced Swift-XRT position
  35. GRB 170629A: Fermi GBM observation
  36. GRB 170629A: Swift detection of a burst
  37. GRB 170626B CALET Gamma-Ray Burst Monitor detection
  38. Konus-Wind observation of GRB 170626B
  39. IPN Triangulation of GRB 170626B
  40. Konus-Wind observation of GRB 170626A
  41. GRB 170626A: SAO RAS confirmation of OT fading
  42. GRB 170626A: TShAO optical observations
  43. GRB 170607A: 15 GHz upper limits from AMI
  44. GRB 170626A: Insight-HXMT observation
  45. GRB 170626A: OASDG optical observations
  46. GRB 170626A: MASTER-Tunka OT detection.
  47. GRB 170626A: Swift-BAT refined analysis
  48. GRB 170626A: TNG optical observations
  49. GRB 170626A: Afterglow detection from 1.5m OSN
  50. GRB 170626A: SAO RAS possible OT detection
  51. GRB 170626A: Swift-XRT refined Analysis
  52. GRB 170626A: Fermi GBM observation
  53. GRB 170626B: The first GRB detected by the Insight-HXMT X-ray Telescope (revised)
  54. GRB 170626A: Swift detection of a burst
  55. LIGO/Virgo G288732: Fermi GBM Upper Limits for the LIGO Trigger and LAT Candidate
  56. LIGO/Virgo G288732: Pan-STARRS coverage of the Fermi/LAT candidate position
  57. Swift Trigger 758005 is Probably Not an Astrophysical Source
  58. GRB 170607A CALET Gamma-Ray Burst Monitor detection
  59. Konus-Wind observation of GRB 170616A
  60. IPN Triangulation of GRB 170616A (short/hard)
  61. GRB 170614A: AstroSat CZTI detection
  62. GRB 170614A CALET Gamma-Ray Burst Monitor detection
  63. GRB 170606A CALET Gamma-Ray Burst Monitor detection
  64. LIGO/Virgo G288732: VLA imaging of the possible Fermi/LAT counterpart
  65. LIGO/Virgo G288732: Kiso/KWFC optical imaging of the possible Fermi/LAT counterpart
  66. LIGO/Virgo G288732: HAWC follow-up
  67. Konus-Wind observation of GRB 170604A
  68. Konus-Wind observation of GRB 170607B
  69. LIGO/Virgo G288732: UKIRT near-IR imaging of the Fermi/LAT candidate
  70. LIGO/Virgo G288732: LBT optical imaging of the Fermi/LAT candidate
  71. GRB 170610A: MAXI/GSC detection
  72. IPN Triangulation of GRB 170607B
  73. GRB 170607A: Redshift from GTC/OSIRIS
  74. GRB 170607B: Fermi GBM detection
  75. GRB 170607A: ISON/Terskol optical observations
  76. LIGO/Virgo G288732: GWFUNC/NOWT observations of the skymap and follow-up of the Fermi/LAT candidate
  77. LIGO/Virgo G288732: Swift/BAT data search
  78. GRB 170607B: AstroSat CZTI detection
  79. GRB 170607A: Swift-BAT refined analysis
  80. LIGO/Virgo G288732: Fermi-LAT detection of a weak candidate
  81. GRB 170607A: Correction on the possible host galaxy identification
  82. LIGO/VIRGO G288732: Fermi GBM Observations
  83. GRB 170607A: Swift/UVOT Detection
  84. GRB 170607A: MASTER-Tavrida early OT observations
  85. GRB 170607A: Fermi GBM observation
  86. GRB 170607A: NOT optical afterglow detection
  87. GRB 170607A: Swift-XRT refined Analysis
  88. GRB 170607A: Enhanced Swift-XRT position
  89. GRB 170607A: Swift detection of a burst with a bright optical counterpart
  90. GRB 170526A: 15 GHz upper limits from AMI
  91. GRB 170524A: 15 GHz upper limits from AMI
  92. GRB 170519A: 15 GHz upper limits from AMI
  93. GRB 170531B: Zeiss-1000/CrAO optical observations
  94. GRB 170531B: WHT spectroscopy
  95. GRB 170519A: TShAO and AbAO optical observations
  96. GRB 170604A: Swift/UVOT Observations
  97. GRB 170519A: Mondy optical observations
  98. GRB 170529A: AstroSat CZTI detection
  99. GRB 170604A: RATIR Optical and NIR Observations
  100. GRB 170604A: AbAO optical observations

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