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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"
  1. GRB 140814A: MASTER optical follow-up inspection
  2. GRB 140814A: Swift-XRT and UVOT observations
  3. GRB 140814A: MAXI/GSC detection
  4. Swift Mission Operations Center Moving
  5. GRB 140808A / iPTF14eag optical follow-up at HCT
  6. IPN triangulation of GRB 140810A
  7. GRB 140808A: Confirmation of the Swift-XRT afterglow
  8. GRB140809A: Fermi GBM observation
  9. GRB 140810A: Fermi GBM observation
  10. Konus-Wind observation of GRB 140810A
  11. GRB140810A: Fermi-LAT detection
  12. Swift trigger 609139 is probably 4U 1850-03
  13. Swift observations of possible GRB 140809A candidate
  14. GRB 140809A : Virtual Telescope optical observations
  15. GRB 140809A (FERMI trigger 429246673): MASTER follow-up inspection
  16. Konus-Wind observation of GRB 140808A
  17. GRB 140808A: Swift/UVOT Upper Limits
  18. GRB 140808A: Redshift from the 10.4m GTC telescope
  19. GRB 140808A: Swift-XRT observations
  20. GRB 140808A: Fermi GBM detection
  21. GRB 140808A: optical afterglow candidate iPTF14eag
  22. GRB 140801A: AAO optical observations
  23. GRB 140801A: GROND Afterglow detection, unbroken decay
  24. GRB140801A: Swift/XRT further observations
  25. GRB 140730A: GROND Upper limits
  26. GRB 140801A: BTA confirmation of redshift
  27. GRB 140801A: Swift/UVOT Upper Limits
  28. GRB 140801A: Swift-XRT observations
  29. Konus-Wind observation of GRB 140801A
  30. GRB 140801A : Virtual Telescope optical observations
  31. GRB 140801A: Fermi GBM observation
  32. GRB 140801A: Redshift from the 10.4m GTC telescope
  33. GRB 140801A: NOT afterglow confirmation
  34. IPN triangulation of GRB 140801A (Fermi trigger 428612396)
  35. GRB 140801A: archival upper limits on the host galaxy
  36. GRB 140801A (FERMI trigger 428612396): MASTER brigth OT discovery
  37. GRB 140730A, Swift-BAT refined analysis
  38. GRB 140709B: TShAO optical upper limit
  39. GRB 140709A, the review of the sky area in plate archives
  40. Swift Trigger 607945: possible noise event in the direction of NGC2559
  41. Konus-Wind observation of GRB 140729A
  42. GRB 140730A: LCO-Sutherland observations
  43. GRB 140730A: Swift-XRT refined Analysis
  44. GRB 140730A: Swift/UVOT Upper Limits
  45. GRB 140730A: Enhanced Swift-XRT position
  46. GRB 140730A: Prompt enhanced Swift-XRT position
  47. GRB 140730A: Swift detection of a burst
  48. Radio upper limit on the GRB 140713A with the GMRT
  49. GRB 140729A: iPTF optical upper limit
  50. Swift Trigger 607506 is probably noise
  51. GRB 140729A: Swift-XRT and UVOT observations
  52. IPN Triangulation of GRB 140729A
  53. GRB 140729A: Fermi-GBM detection
  54. Correction to Fermi-LAT GCN Circular 16633
  55. GRB 140729A Tiled Swift observations
  56. GRB 140729A: Fermi-LAT detection
  57. Trigger 607399: Swift detection of SGR1806-20
  58. GRB 140723A: Swift-XRT and UVOT observations
  59. GRB 140723A: LCO-Sutherland optical candidate retraction
  60. GRB 140723A: MASTER optical observation
  61. Konus-Wind observation of GRB 140723A
  62. GRB 140723A: LCO-Sutherland optical candidate
  63. GRB 140723A: Fermi GBM detection
  64. IPN Triangulation of GRB 140723A
  65. GRB 140723A Tiled Swift observations
  66. GRB 140723A: Fermi-LAT detection
  67. GRB 140709B: Swift/UVOT Upper Limits
  68. Konus-Wind observation of GRB 140721A
  69. IPN Triangulation of GRB 140721A
  70. GRB 140719B: Swift XRT observation
  71. GRB 140719A: Swift/UVOT Upper Limits
  72. GRB 140721A: Fermi GBM detection
  73. GRB 140716A: Confirmation of the Swift-XRT afterglow
  74. GRB 140719B, Swift-BAT refined analysis
  75. GRB 140716A: GROND confirmation of the afterglow
  76. GRB 140719A, Swift-BAT refined analysis
  77. GRB 140719A: FTS observations
  78. GRB 140719A: GROND Afterglow candidate
  79. GRB 140719B: Zadko observatory - Gingin optical observations
  80. GRB 140719B: Swift detection of a burst
  81. GRB 140719A: Swift-XRT refined Analysis
  82. GRB 140719A: Enhanced Swift-XRT position
  83. GRB 140719A: Swift detection of a burst
  84. Konus-Wind observation of GRB 140716A
  85. GRB 140716A: Swift/UVOT Upper Limits
  86. GRB 140713A: AMI 15 GHz detection
  87. GRB 140713A: 10.4-m GTC deep optical observation
  88. GRB 140716A: GROND afterglow candidate
  89. GRB 140716A: Swift-XRT detection of an afterglow candidate
  90. GRB 140716A: A Fermi GBM Detection
  91. GRB 140716A BAT refined analysis
  92. Swift observations of a flare from UX Ari
  93. GRB 140716A found in ground analysis of Swift-BAT data
  94. GRB 140709A: Possible AMI 15 GHz detection
  95. Swift detection of UX Ari
  96. GRB 140713A: CARMA mm detection
  97. GRB 140714A: Fermi GBM detection
  98. Radio upper limits on the GRB 140703A with the GMRT
  99. GRB 140713A: Fermi GBM detection
  100. GRB 140713A: Swift-XRT refined Analysis

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