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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"

19534 results found.

  1. GRB 141026A: Enhanced Swift-XRT position
  2. GRB 141026A: GROND observations
  3. GRB 141026A: RATIR Optical Observations
  4. GRB 141026A: P60 early observations
  5. GRB 141026A: Swift detection of a burst
  6. GRB 141020A: AAO optical upper limit
  7. GRB 141020A: Khureltogot optical upper limit
  8. GRB141022A: Fermi GBM Detection
  9. GRB 141022A: Swift/UVOT Upper Limits
  10. GRB 141020A: Mondy optical observations
  11. GRB 141022A: Swift-BAT refined analysis
  12. GRB 141022A: Swift-XRT refined Analysis
  13. GRB141015A iTelescope observation
  14. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  15. GRB 141022A: Swift detection of a burst
  16. GRB 141004A: RATIR Late Time Optical and NIR Observations
  17. GRB 141020A: Swift-BAT refined analysis
  18. GRB 141020A: Swift-XRT refined Analysis
  19. GRB 141020A: 1.4 GHZ observation
  20. GRB 141020A: Swift/UVOT Detection
  21. GRB 141020A: Enhanced Swift-XRT position
  22. GRB 141020B: MAXI/GSC detection
  23. Konus-Wind observation of GRB 141017A
  24. GRB 141020A: Swift detection of a burst with an optical counterpart
  25. GRB 141017A, Swift-BAT refined analysis
  26. GRB 141017A: GROND Afterglow Confirmation
  27. GRB 141015A: Swift-XRT afterglow confirmation and refined Analysis
  28. GRB 141017A: Swift/UVOT Detection
  29. GRB 141017A: Swift-XRT refined Analysis
  30. GRB 141017A: Enhanced Swift-XRT position
  31. GRB 141017A: Zadko observatory - Gingin optical observations
  32. GRB 141017A: Swift detection of a burst
  33. GRB 141015A: Swift/UVOT Upper Limits
  34. GRB 141015A: Swift-BAT refined analysis
  35. GRB 141015A: RATIR Optical Upper Limits
  36. GRB 141015A: Enhanced Swift-XRT position
  37. GRB 141015A: Super-LOTIS early observations
  38. GRB 141015A: ISON-NM early optical observations
  39. GRB 141015A: Swift/XRT localization
  40. GRB 141015A: Swift detection of a burst
  41. IPN Triangulation of GRB 141011A (short/hard)
  42. Trigger 614903: Swift detection of IGR J17544-2619
  43. GRB 141005A: iTelescope.Net T21 Optical Observation
  44. GRB 141005A: Additional P60 imaging and afterglow confirmation
  45. GRB 141004A: Fermi GBM observation
  46. GRB 141004A: GROND observations
  47. GRB 141005A: GROND observations
  48. Konus-Wind observation of GRB 141005A
  49. GRB 141004A: Swift-XRT refined Analysis
  50. GRB 141005A: Swift-XRT refined Analysis
  51. GRB 141005A: Swift/UVOT Upper Limits
  52. GRB 141005A: Swift-BAT refined analysis
  53. GRB 141004A: Swift-BAT refined analysis
  54. GRB 141004A: Swift/UVOT Detection
  55. GRB 141005A: Fermi GBM Detection
  56. GRB 141005A: Enhanced Swift-XRT position
  57. GRB 141004A: RATIR Optical Observations
  58. GRB 141005A: P60 probable afterglow deteaction
  59. GRB 141004A: Enhanced Swift-XRT position
  60. GRB 141005A: Swift detection of a burst
  61. GRB 141004A: a long GRB detected by INTEGRAL
  62. GRB 141004A: Swift detection of a burst with an optical counterpart
  63. Swift observations of HD 305560
  64. GRB 140928A: Swift-XRT follow-up observations
  65. Swift possible detection of the Be star HD 305560
  66. GRB 140930B: Gemini South Spectroscopy
  67. GRB 140930B: GROND observations
  68. GRB 140930B Swift-BAT refined analysis
  69. GRB 140930B: Swift/UVOT Upper Limits
  70. Konus-Wind observation of GRB 140930B
  71. GRB 140930B: Swift-XRT refined Analysis
  72. GRB 140930B: Enhanced Swift-XRT position
  73. GRB 140930B: Prompt enhanced Swift-XRT position
  74. GRB 140930B: MASTER early optical observations
  75. GRB 140930B: Swift detection of a short burst
  76. IPN Triangulation of GRB 140928A
  77. GRB 140928A: Fermi GBM detection
  78. GRB 140928A: GROND Afterglow Candidate
  79. GRB 140928A: Swift-XRT observations
  80. GRB 140928A: Fermi-LAT detection
  81. GRB 140927A: Swift-UVOT analysis
  82. GRB 140927A: Swift-BAT refined analysis
  83. GRB 140927A: Swift-XRT refined Analysis
  84. GRB 140927A: Enhanced Swift-XRT position
  85. GRB 140927A: Swift detection of a burst
  86. Swift Trigger 613581 is not an astrophysical event
  87. Swift Trigger 613516 is not an astrophysical event
  88. GRB 140919A, Swift-BAT refined analysis
  89. GRB 140919A: Swift-XRT refined Analysis
  90. GRB 140919A: Swift/UVOT Detection
  91. GRB 140919A: GROND afterglow candidate
  92. GRB 140919A: Fermi GBM observation
  93. GRB 140919A: Enhanced Swift-XRT position
  94. GRB 140919A: Swift/UVOT observations
  95. GRB 140919A: Swift-XRT observations
  96. GRB 140919A: Swift detection of a burst
  97. Swift detection of outburst from 4U 1700+24
  98. GRB 140916A: Swift/UVOT Upper Limits
  99. GRB 140916A: Swift-BAT refined analysis
  100. GRB 140916A: UKIRT J-band observations

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