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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"

19666 results found.

  1. GRB 161214B: Prompt enhanced Swift-XRT position
  2. GRB 161214B: Swift detection of a burst
  3. GRB 161129A: KWFC z-band photometry
  4. Konus-Wind observation of GRB 161202A
  5. MASTER: Optical Blazar Flare Detection during Fermi trigger 502272781 inspection
  6. GRB 161129A: POLAR Detection
  7. GRB 161202A: Astrosat CZTI detection
  8. GRB 161202A: RATIR Optical and NIR Observations
  9. GRB 161202A: Swift-BAT refined analysis
  10. GRB 161202A: Swift/UVOT Upper Limits
  11. GRB 161202A: Swift-XRT refined Analysis
  12. GRB 161202A: Fermi-LAT detection
  13. GRB 161202A: Enhanced Swift-XRT position
  14. GRB 161202A: Swift detection of a burst
  15. GRB 161129A: Swift-BAT refined analysis
  16. GRB 161129A: Fermi GBM Detection
  17. GRB 161129A: Swift/UVOT Detection
  18. GRB161129A : Astrosat CZTI detection
  19. GRB 161129A: Swift-XRT refined Analysis
  20. GRB 161129A: Enhanced Swift-XRT position
  21. GRB 161129A: Swift detection of a burst
  22. GRB 161123A: Swift-XRT observations
  23. Swift Trigger 723539 is not an astrophysical event
  24. GRB 161123A: Tiled Swift observations
  25. GRB 161108A: 15 GHz upper limits from AMI
  26. Swift Trigger 723124 is probably not a GRB
  27. GRB 161117B: Swift-XRT refined Analysis
  28. Konus-Wind observation of GRB 161117A
  29. GRB 161117A iTelescope observation
  30. GRB 161117A: MASTER-OAFA (Argentina) prompt OT observations
  31. GRB 161117A: TAROT La Silla observatory optical observations
  32. GRB 161117A: Fermi GBM detection/observation
  33. GRB 161117B: Swift/UVOT Upper Limits
  34. GRB 161117A: Swift/UVOT Detection
  35. GRB 161117B: Swift-BAT refined analysis
  36. GRB 161117A: Swift-BAT refined analysis
  37. Swift Trigger 722681 is probably not a GRB
  38. GRB 161117B: Enhanced Swift-XRT position
  39. GRB 161117A: Swift-XRT refined Analysis
  40. GRB 161117A: Enhanced Swift-XRT position
  41. GRB 161117B: LCO optical observations
  42. GRB 161117B: Swift detection of a burst
  43. GRB 161117A: Swift detection of a burst with an optical counterpart
  44. GRB 161113A: Swift-BAT refined analysis
  45. GRB 161113A: Swift/UVOT Upper Limits
  46. GRB 161113A: Swift-XRT refined Analysis
  47. GRB 161113A: Enhanced Swift-XRT position
  48. GRB 161113A: RATIR Optical and NIR Observations
  49. GRB 161113A: Swift detection of a burst
  50. GRB 161109A: Swift/UVOT Upper Limits
  51. GRB 161104A: Chandra X-ray observations
  52. GRB 161109A: Swift-XRT observations
  53. GRB 161108A: Swift/UVOT Upper Limits
  54. GRB 161109A: Tiled Swift observations
  55. GRB 161105A: Swift/UVOT Upper Limits
  56. GRB 161109A: Fermi-LAT detection
  57. GRB 161108A: TAROT Calern observatory optical observations
  58. GRB 161105A: TAROT La Silla observatory optical observations
  59. GRB 161108A, Swift-BAT refined analysis
  60. GRB 161108A: Swift-XRT refined Analysis
  61. GRB 161108A: Enhanced Swift-XRT position
  62. GRB 161108A: Swift detection of a burst
  63. GRB 161022A: 15 GHz upper limits from AMI
  64. GRB 161017A: 15 GHz upper limits from AMI
  65. GRB 161105A: Swift-XRT refined Analysis
  66. GRB 161104A: Gemini South optical observations
  67. GRB 161105A: Swift-BAT refined analysis
  68. GRB 161105A: Enhanced Swift-XRT position
  69. GRB 161105A: MASTER-IAC early optical observations
  70. GRB 161104A: GROND observations
  71. GRB 161105A: Swift detection of a burst
  72. GRB 161104A: Swift/UVOT Upper Limits
  73. GRB 161104A, Swift-BAT refined analysis
  74. GRB 161104A: Swift-XRT refined Analysis
  75. IceCube-161103: Swift-XRT observations
  76. GRB 161104A: Enhanced Swift-XRT position
  77. GRB 161104A: Swift detection of a short burst
  78. GRB 161014A: 15 GHz upper limits from AMI
  79. GRB 161023A: Swift-XRT afterglow detection
  80. GRB 161023A: Swift ToO observations
  81. Swift Trigger 718919 is not an astrophysical event.
  82. GRB 161022A: Swift-BAT refined analysis
  83. Swift Trigger 718766 is not an astrophysical event.
  84. GRB 161022A: RATIR Optical and NIR Observations
  85. GRB 161022A: Swift/UVOT Upper Limits
  86. GRB 161022A: Fermi GBM observation
  87. GRB 161022A: Enhanced Swift-XRT position
  88. GRB 161022A: Swift-XRT refined Analysis
  89. IPN Triangulation of GRB 161020B
  90. GRB 161022A: LT observations
  91. GRB 161022A: TAROT Calern observatory optical observations
  92. GRB 161022A: Prompt enhanced Swift-XRT position
  93. GRB 161022A: Swift detection of a burst
  94. GRB 161015A: further Swift-XRT follow-up observations
  95. GRB 161011A: 15 GHz upper limits from AMI
  96. GRB 161007A: 15 GHz upper limits from AMI
  97. Konus-Wind observation of GRB 161017A
  98. GRB 161017A: LT optical observations
  99. GRB161017A optical R band observations with SARA-RM
  100. GRB 161017A: GTC additional spectroscopy and refined redshift

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