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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"

28307 results found.

  1. GRB 130828A: Fermi GBM detection
  2. GRB 130828A: Fermi-LAT detection of a burst
  3. GRB 130822A Swift-BAT Spectral lag analysis
  4. GRB 130821A: Weihai optical upper limit
  5. GRB 130821A: Swift-XRT observation
  6. GRB 130822A: 5.8 GHz VLA upper limit
  7. GRB 130822A: Swift-XRT refined Analysis
  8. GRB 130822A: Swift/UVOT Upper Limits
  9. GRB 130822A: Enhanced Swift-XRT position
  10. GRB 130822A, Swift-BAT refined analysis
  11. GRB 130821A: Fermi-LAT detection of a burst
  12. GRB 130822A: Weihai optical upper limit
  13. GRB 130821A: Fermi GBM Detection
  14. GRB 130822A: Swift detection of a short burst
  15. GRB 130816A: Swift/UVOT Upper Limits
  16. GRB 130816B: Swift/UVOT Upper Limits
  17. GRB 130816B, Swift-BAT refined analysis
  18. GRB 130816B: GROND afterglow candidate
  19. GRB 130816A: Swift-XRT refined Analysis
  20. GRB 130816A, Swift-BAT refined analysis
  21. GRB 130816A: Fermi GBM observation
  22. GRB 130816B: Swift-XRT refined Analysis
  23. GRB 130816B: Enhanced Swift-XRT position
  24. GRB 130816A: GROND confirmation of afterglow
  25. GRB 130816A: Enhanced Swift-XRT position
  26. GRB 130816B: Swift detection of a burst
  27. GRB 130816A: REM NIR candidate afterglow
  28. GRB 130816A: Swift detection of a burst
  29. IPN Triangulation of GRB 130812B (long/soft)
  30. GRB 130812A: Swift/UVOT Upper Limits
  31. GRB 130812A, Swift-BAT refined analysis
  32. GRB 130812A: GROND upper limits
  33. GRB 130812A: Swift-XRT refined Analysis
  34. GRB 130812A: Enhanced Swift-XRT position
  35. GRB 130812A: Swift detection of a burst
  36. GRB130807A: Swift/UVOT observations
  37. GRB 130807A: Swift-XRT refined analysis
  38. GRB 130806A: Swift/UVOT Upper Limits
  39. GRB 130807A, Swift-BAT refined analysis
  40. GRB 130807A: Swift detection of a GRB or Galactic transient
  41. Konus-Wind observation of GRB 130804A
  42. GRB 130623A: GROND detection of the optical/NIR afterglow
  43. GRB 130806A: MITSuME Akeno Optical observation
  44. GRB 130806A: Swift-XRT refined Analysis
  45. GRB 130806A: MITSuME Okayama upper limits
  46. GRB 130806A, Swift-BAT refined analysis
  47. IPN localization of GRB 130804A
  48. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  49. GRB130803A: GROND observations
  50. GRB 130806A: Enhanced Swift-XRT position
  51. GRB 130806A: Swift detection of a burst
  52. GRB 130804A; Fermi GBM observation
  53. Trigger 565443: Swift detection of a burst from SGR J1745-29
  54. GRB 130803A: Swift-XRT refined Analysis
  55. GRB 130803A: RATIR Optical and NIR Observations
  56. GRB130803A: GROND detection of possible host
  57. GRB 130803A: Swift/UVOT Upper Limits
  58. GRB 130803A; Fermi GBM observation
  59. GRB 130803A, Swift-BAT refined analysis
  60. GRB 130803A: Enhanced Swift-XRT position
  61. GRB 130803A: Faulkes Telescope South Observations
  62. GRB 130803A: Swift detection of a burst
  63. GRB 130727A: Watcher optical limit
  64. GRB 130722A: RATIR Optical Observations
  65. GRB 130727A: Swift/UVOT Detection
  66. GRB 130727A: Swift-XRT refined Analysis
  67. GRB 130727A: Fermi GBM detection
  68. GRB 130727A: GROND observations
  69. GRB 130727A: Enhanced Swift-XRT position
  70. GRB 130727A: Swift-BAT refined analysis
  71. GRB 130727A: Swift-XRT observations
  72. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  73. GRB 130725B: Swift/UVOT Observations
  74. GRB 130725A: Swift-XRT refined Analysis
  75. GRB 130725B, Swift-BAT refined analysis
  76. GRB 130725B: Swift-XRT refined Analysis
  77. GRB130725B: REM-ROS2 optical observations
  78. GRB 130725B - UVOT-enhanced XRT position
  79. GRB 130725A: Swift/UVOT Upper Limits
  80. GRB 130725A - Faulkes Telescope South Observations
  81. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  82. GRB 130725A: MITSuME Ishigakijima Optical Observation
  83. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  84. GRB 130725A, Swift-BAT refined analysis
  85. GRB 130719A: Skynet/PROMPT observations
  86. Swift Trigger 563980 is GRB 130725A
  87. Konus-Wind observation of GRB 130722A
  88. GRB 130722A: Swift/UVOT Detection
  89. GRB 130722A: MITSuME Okayama upper limits
  90. GRB 130722A: Enhanced Swift-XRT position
  91. GRB 130722A: Swift-XRT refined Analysis
  92. GRB 130722A: Skynet/GORT observations
  93. GRB 130719A, Swift-BAT refined analysis
  94. GRB 130715A: Suzaku WAM observation of the prompt emission
  95. GRB 130722A: Swift detection of a burst
  96. GRB 130719A: Swift detection of a burst
  97. GRB 130716A: Gemini-North imaging
  98. GRB 130716A: UVOT Upper Limits
  99. GRB 130716A: Probable short-hard burst with delayed Swift data
  100. GRB 130715A: Fermi GBM detection

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Download all Circulars as a .tar.gz archive (updated once a day):
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