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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"

39415 results found.

  1. GRB 120922A: GROND photometric redshift
  2. GRB 120922A: Fermi GBM detection
  3. GRB 120922A: Swift/UVOT Detection
  4. GRB 120923A: Swift-BAT refined analysis
  5. GRB 120922A: Swift-BAT refined analysis
  6. GRB 120923A: Swift/UVOT Upper Limit
  7. GRB 120922A: Swift-XRT refined Analysis
  8. GRB 120922A: Swift/UVOT Observations
  9. GRB 120923A: Gemini afterglow detection, high-z candidate
  10. GRB 120923A: Enhanced Swift-XRT position
  11. GRB 120922A: Enhanced Swift-XRT position
  12. GRB 120922A: TAROT La Silla observatory optical observations
  13. GRB 120923A: TAROT La Silla observatory optical observations
  14. GRB 120923A: ROTSE-III Optical Limits
  15. GRB 120923A: Swift detection of a burst
  16. GRB 120922A: GROND afterglow candidate
  17. GRB 120922A: Prompt enhanced Swift-XRT position
  18. GRB 120922A: Swift detection of a burst
  19. GRB 120919B: MASTER prompt optical observations
  20. GRB 120919A: Swift/UVOT Upper Limits
  21. GRB 120919A: Swift-XRT observations
  22. Konus-Wind observation of GRB 120919B
  23. IPN Triangulation of long GRB 120919B
  24. Konus-Wind observation of GRB 120919A
  25. IPN Triangulation of long GRB 120919A
  26. GRB 120919A: Fermi GBM detection
  27. GRB 120918A: Swift-BAT refined analysis
  28. GRB 120916A: Fermi GBM Observation
  29. Konus-Wind observation of GRB 120916A
  30. Swift Trigger 534017 is probably not real.
  31. GRB 120918A: Swift detection of a burst
  32. IPN Triangulation of long GRB 120916A
  33. GRB 120916A: Fermi-LAT detection of a burst
  34. Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A
  35. Swift Trigger 533836 is a new Galactic transient
  36. GRB 120913B: Fermi GBM observation
  37. GRB 120913B: Swift-BAT refined analysis
  38. GRB 120913A: Fermi GBM observation
  39. GRB 120913B: FRAM early follow up and detection
  40. GRB 120913A: Swift-BAT refined analysis
  41. GRB 120913B: REM NIR early time detection
  42. Continued Skynet/PROMPT observations of GRB120913B
  43. GRB 120913B: TAROT La Silla observatory optical photometry
  44. GRB 120913B: TAROT La Silla observatory optical detection
  45. Skynet/PROMPT observations of GRB120913B
  46. GRB 120913B: Swift detection of a burst
  47. GRB 120913A: Swift detection of a burst
  48. GRB 120907A: optical observations of ISON-Kislovodsk
  49. GRB 120911A: optical upper limit CrAO
  50. GRB 120911A: optical upper limit ISON-NM
  51. Konus-Wind observation of GRB 120911B
  52. GRB 120911B: Fermi GBM observation
  53. GRB 120911B: Fermi-LAT detection of a burst
  54. IPN Triangulation of GRB 120911B (long/bright)
  55. GRB 120911A: Fermi GBM observation
  56. GRB120911A: MITSuME Okayama Optical upper limits
  57. GRB 120911A: Fermi/LAT upper limit
  58. GRB 120911A: Swift/UVOT Upper Limits
  59. GRB 120911A: Swift-XRT refined Analysis
  60. GRB 120911A: Swift-BAT refined analysis
  61. GRB 120911A: Enhanced Swift-XRT position
  62. GRB 120911A: Faulkes Telescope North observations
  63. GRB 120911A: Swift-XRT observations
  64. GRB 120911A: ROTSE-III Optical Limits
  65. GRB 120911A: Swift detection of a burst
  66. GRB 120907A: SMA upper limits
  67. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  68. GRB 120908A: Fermi GBM detection
  69. GRB 120908A: Swift Observations
  70. GRB 120909A: TAROT La Silla observatory optical observations
  71. GRB 120909A: Pi of the Sky upper limits
  72. GRB 120909A: Fermi GBM observation
  73. Konus-Wind observation of GRB 120909A
  74. GRB 120909A: Swift/UVOT Detection
  75. GRB 120909A: Swift-XRT refined Analysis
  76. GRB 120909A: Swift-BAT refined analysis
  77. GRB 120909A: Enhanced Swift-XRT position
  78. GRB 120908A: MAXI/GSC detection
  79. GRB 120909A: X-Shooter redshift 3.93
  80. GRB 120909A: GROND detection of the afterglow
  81. Skynet/PROMPT Observations of GRB120909A
  82. GRB 120909A: Swift detection of a burst
  83. GRB 120907A: EVLA observations
  84. GRB 120907A: Swift/UVOT Detection
  85. GRB 120907A: Swift-XRT refined Analysis
  86. GRB 120907A: Spectroscopy from OSIRIS/GTC
  87. GRB 120907A: Enhanced Swift-XRT position
  88. GRB 120907A: Fermi GBM detection
  89. GRB 120907A: Swift-BAT refined analysis
  90. GRB 120907A: NOT optical observations
  91. GRB 120907A MASTER optical observations
  92. GRB 120907A: ROTSE-III Optical Limits
  93. GRB 120907A: Swift detection of a burst with optical counterpart
  94. GRB 120819A: optical upper limit
  95. GRB 120802A: optical observations in CrAO
  96. GRB 120830A: Further Swift Observations
  97. GRB 120830A: catalog source at Uvot position
  98. GRB 120830A: Swift-XRT and UVOT observations
  99. GRB 120830A: Fermi GBM observation
  100. Konus-Wind observation of GRB 120830A

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