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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. GRB161017A: optical observations with 1-m LCOGT McDonald
  2. GRB 161017A: Fermi GBM observation
  3. GRB 161017A: Enhanced Swift-XRT position
  4. GRB 161014A: Continued RATIR Optical and NIR Observations
  5. GRB 161015A: Swift/UVOT observations
  6. GRB 161017A: Swift detection of a burst with a bright optical afterglow
  7. GRB161017.74 MASTER-Net OT detection
  8. Konus-Wind observation of GRB 161014A
  9. GRB 161015A: Swift-XRT observations
  10. GRB 161015A: Tiled Swift observations
  11. GRB 161015A: Fermi-LAT detection
  12. GRB161004A: Further analysis of the burst nature
  13. GRB 161014A: RATIR Optical and NIR Observations
  14. GRB 161014A: Fermi GBM observation
  15. GRB 161014A: Swift-XRT refined Analysis
  16. GRB 161014A: Swift-BAT refined analysis
  17. GRB 161014A: AROMA-N Optical Observation
  18. GRB 161014A: Swift/UVOT Detection
  19. GRB 161011A: RATIR Optical and NIR Observations
  20. GRB 161014A: Swift-XRT and UVOT afterglow detection
  21. GRB 161014A : Xinglong TNT optical observation
  22. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  23. GRB 161014A: Swift detection of a burst
  24. GRB 161010A: Swift/UVOT Possible Detection
  25. GRB 161011A, Swift-BAT refined analysis
  26. GRB 161011A: Swift burst of interest
  27. GRB 161011A: Swift/UVOT Upper Limits
  28. GRB 161011A: Swift-XRT refined Analysis
  29. GRB 161011A: Enhanced Swift-XRT position
  30. GRB 161010A: Swift-XRT afterglow detection
  31. GRB 161011A: Prompt enhanced Swift-XRT position
  32. GRB 161011A: Swift detection of a burst
  33. GRB 161010A: Swift ToO observations
  34. GRB 161007A: Swift-BAT refined analysis
  35. GRB 161007A: Swift/UVOT Upper Limits
  36. GRB 161007A: Swift-XRT refined Analysis
  37. GRB 161007A: GTC observations
  38. GRB 161007A: Enhanced Swift-XRT position
  39. GRB 161007A: Prompt enhanced Swift-XRT position
  40. GRB 161007A: MASTER-net early optical observations
  41. GRB 161007A: Swift detection of a burst
  42. GRB 160821A: Maisoncelles observatory optical observations
  43. Konus-Wind observation of GRB 161004B
  44. GRB 161004A: Swift-BAT refined analysis
  45. GRB 161004B: Fermi GBM detection
  46. GRB 161004B: Swift/UVOT Upper Limits
  47. GRB161004B: AstroSat CZTI detection
  48. GRB 161004B: Swift-BAT refined analysis
  49. GRB 161004B: Swift-XRT refined Analysis
  50. GRB 161004A: RATIR Optical and NIR Observations
  51. GRB 161004B: Enhanced Swift-XRT position
  52. GRB 161004B: Prompt enhanced Swift-XRT position
  53. GRB 161004B: Swift detection of a burst
  54. GRB 161004A: Swift-XRT refined Analysis
  55. GRB 161004A: Swift/UVOT Detection
  56. GRB 161004A: Enhanced Swift-XRT position
  57. Swift Trigger 715209 is not an astrophysical event
  58. GRB 161004A: Bassano Bresciano Observatory upper limit
  59. GRB 161004A: Swift detection of a burst with a possible optical counterpart
  60. GRB 160927A: 15 GHz upper limits from AMI
  61. Konus-Wind observation of GRB 161001A (short/hard ?)
  62. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  63. GRB 161001A: GROND afterglow candidate
  64. GRB 161001A, Swift-BAT refined analysis (likely a short GRB)
  65. GRB 161001A: Fermi GBM detection
  66. GRB 161001A: Swift-XRT refined Analysis
  67. GRB 161001A: Swift/UVOT Upper Limits
  68. GRB 161001A: Enhanced Swift-XRT position
  69. GRB 161001A: Prompt enhanced Swift-XRT position
  70. GRB 161001A: Swift detection of a burst
  71. GRB 160927A: Swift/UVOT Upper Limits
  72. GRB 160927A: Bassano Bresciano Observatory optical upper limit
  73. GRB 160927A: Swift-BAT refined analysis
  74. GRB 160927A: GROND Observations
  75. GRB 160927A: Swift-XRT refined Analysis
  76. GRB 160927A: Enhanced Swift-XRT position
  77. GRB 160927A: RTT150 optical afterglow candidate
  78. GRB 160927A: Prompt enhanced Swift-XRT position
  79. GRB 160927A: Swift detection of a short hard burst
  80. GRB 160917A: 15 GHz upper limits from AMI
  81. GRB 160912A: 15 GHz upper limits from AMI
  82. XRT refined analysis for GRB 160925A
  83. GRB160917A: AstroSat CZTI detection
  84. GRB 160925A: Swift ToO observations
  85. GRB 160917A: Swift-BAT refined analysis
  86. GRB 160917A: RATIR Optical and NIR Observations
  87. GRB 160917A: Fermi GBM observation
  88. GRB 160917A: Swift/UVOT Detection
  89. GRB 160917A: Swift-XRT refined Analysis
  90. GRB 160917A: Enhanced Swift-XRT position
  91. GRB 160917A: Swift detection of a burst
  92. GRB 160912A, Swift-BAT refined analysis
  93. GRB 160910A: Swift/UVOT Detection
  94. GRB 160912A: Swift/UVOT Weak Afterglow Detection
  95. GRB 160912A Liverpool Telescope optical afterglow
  96. GRB 160912A: Swift-XRT refined Analysis
  97. GRB 160912A: Fermi GBM detection
  98. GRB 160912A: Enhanced Swift-XRT position
  99. GRB 160912A: Swift detection of a burst
  100. GRB 160910A: Correction to GCN 19904

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