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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"

19662 results found.

  1. GRB 170710A: Prompt enhanced Swift-XRT position
  2. GRB 170710A: Swift detection of a burst
  3. Correction to GCN Circular 21305: Trigger 760835: Swift misidentification of GRS1716-249
  4. Trigger 760835: Swift misidentification of GRS1716-249
  5. GRB 170705A: Further RATIR Optical and NIR Observations and Steepening of Fading
  6. GRB 170705A: KAIT Optical Observations
  7. GRB 170705A: Insight-HXMT observation
  8. GRB 170705A: ISON/Terskol optical observations
  9. Konus-Wind observation of GRB 170705A
  10. GRB 170705A: Fermi GBM observation
  11. GRB 170705A: Swift-BAT refined analysis
  12. GRB 170705A: Swift/UVOT Detection
  13. GRB 170705A: RATIR Optical and NIR Observations
  14. GRB 170705A: Swift-XRT refined Analysis
  15. GRB 170705A: MASTER-OAFA early OT observations
  16. GRB 170705A: Enhanced Swift-XRT position
  17. GRB 170705A: Swift detection of a burst with an optical counterpart
  18. GRB 170629A: Swift-XRT refined Analysis
  19. GRB 170629A: Swift-BAT refined analysis
  20. GRB 170629A: Enhanced Swift-XRT position
  21. GRB 170629A: Fermi GBM observation
  22. GRB 170629A: Swift detection of a burst
  23. IPN Triangulation of GRB 170626B
  24. Konus-Wind observation of GRB 170626A
  25. GRB 170626A: TShAO optical observations
  26. GRB 170607A: 15 GHz upper limits from AMI
  27. GRB 170626A: Insight-HXMT observation
  28. GRB 170626A: MASTER-Tunka OT detection.
  29. GRB 170626A: Swift-BAT refined analysis
  30. GRB 170626A: Swift-XRT refined Analysis
  31. GRB 170626A: Fermi GBM observation
  32. GRB 170626A: Swift detection of a burst
  33. Swift trigger 758168 is probably not an astrophysical source
  34. Swift Trigger 758005 is Probably Not an Astrophysical Source
  35. Swift Trigger 756953: false identification by MASTER GCN 21250
  36. Swift Trigger 756953 is probably not an astrophysical source
  37. GRB170612.87 MASTER-Net OT detection
  38. LIGO/Virgo G288732: Kiso/KWFC optical imaging of the possible Fermi/LAT counterpart
  39. Konus-Wind observation of GRB 170604A
  40. LIGO/Virgo G288732: UKIRT near-IR imaging of the Fermi/LAT candidate
  41. LIGO/Virgo G288732: LBT optical imaging of the Fermi/LAT candidate
  42. LIGO/Virgo G288732: GWFUNC/NOWT observations of the skymap and follow-up of the Fermi/LAT candidate
  43. LIGO/Virgo G288732: Swift/UVOT follow up of the possible LAT counterpart
  44. LIGO/Virgo G288732: Swift/BAT data search
  45. LIGO/Virgo G288732: Swift-XRT follow up of the putative LAT counterpart
  46. GRB 170607A: Swift-BAT refined analysis
  47. LIGO/Virgo G288732: Fermi-LAT detection of a weak candidate
  48. GRB 170607A: Swift/UVOT Detection
  49. GRB 170607A: MASTER-Tavrida early OT observations
  50. GRB 170607A: Fermi GBM observation
  51. GRB 170607A: Swift-XRT refined Analysis
  52. GRB 170607A: Enhanced Swift-XRT position
  53. GRB 170607A: Swift detection of a burst with a bright optical counterpart
  54. GRB 170526A: 15 GHz upper limits from AMI
  55. GRB 170524A: 15 GHz upper limits from AMI
  56. GRB 170519A: 15 GHz upper limits from AMI
  57. GRB 170604A: Swift/UVOT Observations
  58. GRB 170604A: RATIR Optical and NIR Observations
  59. GRB 170604A: AbAO optical observations
  60. Swift trigger 755873: Swift BAT and XRT refined analysis
  61. GRB 170522A: confirmation of the X-ray afterglow
  62. GROND observations of GRB170604A
  63. Swift Trigger 755873: MASTER Net optical observations
  64. GRB 170604A: Swift-XRT refined Analysis
  65. GRB 170604A: Enhanced Swift-XRT position
  66. GRB 170604A: Swift-BAT refined analysis
  67. Swift Trigger 755873: D50 optical limits
  68. Swift Trigger 755873: a possible GRB
  69. GRB 170604A: Swift detection of a burst
  70. Trigger 755848: Swift spurious trigger on Cen X-3
  71. GRB 170531B: Swift/UVOT Detection
  72. GRB 170531B: Swift-BAT refined analysis
  73. GRB 170531A: Swift/UVOT Upper Limits
  74. GRB 170531B: LCO observations
  75. GRB 170531B: Swift-XRT refined Analysis
  76. GRB 170531A: MASTER Net job
  77. GRB 170531A: Swift-XRT refined Analysis
  78. GRB 170531B: MASTER Net optical counterpart refind position and magnitude
  79. GROND observations of GRB 170531B
  80. GRB 170531B: Redshift from GTC/OSIRIS
  81. GRB 170531B: Enhanced Swift-XRT position
  82. GRB 170531A: Swift/UVOT Observations
  83. GRB 170531B: Swift detection of a burst
  84. GRB 170531A: Swift detection of a burst
  85. GRB 170524B: Swift-UVOT/XRT Confirmation of Afterglow
  86. IPN Triangulation of GRB 170529A (long)
  87. GRB 170526A, Swift-BAT refined analysis
  88. GRB 170526A: Swift/UVOT Upper Limits
  89. GRB 170526A: Swift-XRT refined Analysis
  90. GRB 170524A: RATIR Optical and NIR Observations
  91. GRB 170526A: Enhanced Swift-XRT position
  92. GRB 170524B: Swift-XRT observations
  93. GRB 170526A: Swift detection of a burst
  94. Konus-Wind observation of GRB 170524B
  95. GRB 170524B: MASTER-OAFA observations
  96. GRB 170524A: TSHAO and CrAO optical observations
  97. GRB 170524B: Swift ToO observations
  98. GRB 170524A: Swift-BAT refined analysis
  99. GRB 170524B: Swift detection of a burst
  100. GRB 170524A: Swift/UVOT Upper Limits

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