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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"

19664 results found.

  1. GRB 140930B Swift-BAT refined analysis
  2. GRB 140930B: Swift/UVOT Upper Limits
  3. Konus-Wind observation of GRB 140930B
  4. GRB 140930B: Swift-XRT refined Analysis
  5. GRB 140930B: Enhanced Swift-XRT position
  6. GRB 140930B: Prompt enhanced Swift-XRT position
  7. GRB 140930B: MASTER early optical observations
  8. GRB 140930B: Swift detection of a short burst
  9. IPN Triangulation of GRB 140928A
  10. GRB 140928A: Fermi GBM detection
  11. GRB 140928A: GROND Afterglow Candidate
  12. GRB 140928A: Swift-XRT observations
  13. GRB 140928A: Fermi-LAT detection
  14. GRB 140927A: Swift-UVOT analysis
  15. GRB 140927A: Swift-BAT refined analysis
  16. GRB 140927A: Swift-XRT refined Analysis
  17. GRB 140927A: Enhanced Swift-XRT position
  18. GRB 140927A: Swift detection of a burst
  19. Swift Trigger 613581 is not an astrophysical event
  20. Swift Trigger 613516 is not an astrophysical event
  21. GRB 140919A, Swift-BAT refined analysis
  22. GRB 140919A: Swift-XRT refined Analysis
  23. GRB 140919A: Swift/UVOT Detection
  24. GRB 140919A: GROND afterglow candidate
  25. GRB 140919A: Fermi GBM observation
  26. GRB 140919A: Enhanced Swift-XRT position
  27. GRB 140919A: Swift/UVOT observations
  28. GRB 140919A: Swift-XRT observations
  29. GRB 140919A: Swift detection of a burst
  30. Swift detection of outburst from 4U 1700+24
  31. GRB 140916A: Swift/UVOT Upper Limits
  32. GRB 140916A: Swift-BAT refined analysis
  33. GRB 140916A: UKIRT J-band observations
  34. GRB 140916A: Swift-XRT refined Analysis
  35. GRB 140916A: Enhanced Swift-XRT position
  36. GRB 140916A: FTS observations
  37. GRB 140916A: Prompt enhanced Swift-XRT position
  38. GRB 140916A: Swift detection of a burst
  39. GRB 140907A: Continued DCT Observations
  40. GRB 140909A: Confirmation of the Swift-XRT afterglow
  41. GRB 140907A: Mondy optical observations
  42. GRB 140909A: Swift/UVOT Upper Limits
  43. GRB 140909A: Swift-XRT observations
  44. GRB 140907A: TShAO observations
  45. GRB 140909A: Swift detection of a GRB
  46. GRB 140907A: MASTER optical observations
  47. Refined IPN Triangulation of GRB 140906C
  48. IPN Triangulation of GRB 140906C (short/hard)
  49. GRB 140907A: T100 observations
  50. GRB 140907A: Swift-BAT refined analysis
  51. GRB 140907A: Fermi GBM Detection
  52. GRB 140907A: Swift-XRT refined Analysis
  53. GRB 140907A: Enhanced Swift-XRT position
  54. GRB140907A: Swift UVOT detection
  55. GRB 140907A: Swift detection of a burst with an optical counterpart
  56. GRB 140903A: Confirmation of Optical Fading from Discovery Channel Telescope
  57. GRB 140901B: Swift XRT observation
  58. GRB 140903A: FTN observations
  59. GRB 140818B: TShAO optical upper limit
  60. GRB 140903A: MAXI/GSC upper limit
  61. GRB 140901B: Fermi GBM detection
  62. GRB 140901B found in ground analysis of BAT data
  63. GRB 140903A: Swift/UVOT Upper Limits
  64. GRB 140903A: Swift-BAT Spectral lag analysis
  65. GRB 140903A: P60 Optical Observations
  66. GRB140903A: Discovery Channel Telescope Optical Detection
  67. GRB 140903A: Swift-BAT refined analysis
  68. GRB 140903A: Swift-XRT refined Analysis
  69. GRB 140903A: Confirmed Swift detection of a short burst
  70. GRB 140903A: Preliminary Swift/XRT localization
  71. GRB 140903A: Swift detection of a possible burst
  72. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  73. GRB 140828A, Swift-BAT refined analysis
  74. GRB 140828A: Fermi GBM observation
  75. Swift Mission Operations Center Fully Operational
  76. IPN Triangulation of GRB 140825A (very intense/long)
  77. GRB 140828A: Swift detection of a burst
  78. Swift Burst Response Reenabled
  79. GRB 140818B: TLS observations
  80. GRB 140824A: optical upper limit in CrAO
  81. GRB 140824B: Swift observations
  82. Swift Mission Operations Center Moving Tomorrow
  83. GRB 140824A: Swift-XRT refined Analysis
  84. GRB 140824A: Swift-BAT refined analysis
  85. GRB 140824A: Enhanced Swift-XRT position
  86. GRB 140824A: Swift/UVOT Upper Limits
  87. GRB 140824A: Swift detection of a burst
  88. Fermi trigger 430148973: Swift-XRT observation
  89. GRB 140818A: GROND confirmation of afterglow candidate
  90. GRB 140818B, Swift-BAT refined analysis
  91. GRB 140818B: Swift/UVOT Upper Limits
  92. GRB 140818B: Swift-XRT refined Analysis
  93. GRB 140818B: Fermi GBM detection
  94. GRB140818B : GROND afterglow candidate
  95. GRB 140818B: Enhanced Swift-XRT position
  96. GRB 140818B: OSN I-band afterglow candidate
  97. GRB 140817A: Swift/UVOT Afterglow Detection
  98. GRB 140818B: Swift detection of a burst
  99. GRB 140818A - Fermi GBM Detection
  100. Swift detection of SAX J1712.6-3739

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