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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"

42868 results found.

  1. GRB 120927A: GROND upper limits
  2. GRB 120927A: Swift-XRT refined Analysis
  3. GRB 120927A: Enhanced Swift-XRT position
  4. GRB 120923A: JHK Observation
  5. GRB 120927A: Swift detection of a burst
  6. Further Swift-XRT observations of the GRB 120919A field.
  7. GRB 120923A: optical upper limit
  8. GRB 120921A: Fermi GBM detection of its 1000th GRB
  9. GRB 120916A Suzaku WAM observation of the prompt emission
  10. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  11. GRB 120923A: CARMA Observations
  12. GRB 120923A: EVLA Observations
  13. GRB 120923A: Swift-XRT refined Analysis
  14. GRB 120923A: GROND Upper limits
  15. GRB 120922A: GROND photometric redshift
  16. GRB 120922A: Fermi GBM detection
  17. GRB 120922A: Swift/UVOT Detection
  18. GRB 120923A: Swift-BAT refined analysis
  19. GRB 120922A: Swift-BAT refined analysis
  20. GRB 120923A: Swift/UVOT Upper Limit
  21. GRB 120922A: Swift-XRT refined Analysis
  22. GRB 120922A: Swift/UVOT Observations
  23. GRB 120923A: Gemini afterglow detection, high-z candidate
  24. GRB 120923A: Enhanced Swift-XRT position
  25. GRB 120922A: Enhanced Swift-XRT position
  26. GRB 120922A: TAROT La Silla observatory optical observations
  27. GRB 120923A: TAROT La Silla observatory optical observations
  28. GRB 120923A: Swift detection of a burst
  29. GRB 120922A: GROND afterglow candidate
  30. GRB 120922A: Prompt enhanced Swift-XRT position
  31. GRB 120922A: Swift detection of a burst
  32. GRB 120919B: MASTER prompt optical observations
  33. GRB 120919A: Swift/UVOT Upper Limits
  34. GRB 120919A: Swift-XRT observations
  35. Konus-Wind observation of GRB 120919B
  36. IPN Triangulation of long GRB 120919B
  37. Konus-Wind observation of GRB 120919A
  38. IPN Triangulation of long GRB 120919A
  39. GRB 120919A: Fermi GBM detection
  40. GRB 120918A: Swift-BAT refined analysis
  41. GRB 120916A: Fermi GBM Observation
  42. Konus-Wind observation of GRB 120916A
  43. Swift Trigger 534017 is probably not real.
  44. GRB 120918A: Swift detection of a burst
  45. IPN Triangulation of long GRB 120916A
  46. GRB 120916A: Fermi-LAT detection of a burst
  47. Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A
  48. Swift Transient Swift J174510.8-262411: Swift-BAT refined analysis
  49. Swift Trigger 533836 is a new Galactic transient
  50. GRB 120913B: Fermi GBM observation
  51. GRB 120913B: Swift-BAT refined analysis
  52. GRB 120913A: Fermi GBM observation
  53. GRB 120913B: FRAM early follow up and detection
  54. GRB 120913A: Swift-BAT refined analysis
  55. GRB 120913B: REM NIR early time detection
  56. Continued Skynet/PROMPT observations of GRB120913B
  57. GRB 120913B: TAROT La Silla observatory optical photometry
  58. GRB 120913B: TAROT La Silla observatory optical detection
  59. Skynet/PROMPT observations of GRB120913B
  60. GRB 120913B: Swift detection of a burst
  61. GRB 120913A: Swift detection of a burst
  62. GRB 120907A: optical observations of ISON-Kislovodsk
  63. GRB 120911A: optical upper limit CrAO
  64. GRB 120911A: optical upper limit ISON-NM
  65. Konus-Wind observation of GRB 120911B
  66. GRB 120911B: Fermi GBM observation
  67. GRB 120911B: Fermi-LAT detection of a burst
  68. IPN Triangulation of GRB 120911B (long/bright)
  69. GRB 120911A: Fermi GBM observation
  70. GRB 120911A: Fermi/LAT upper limit
  71. GRB 120911A: Swift-XRT refined Analysis
  72. GRB 120911A: Swift-BAT refined analysis
  73. GRB 120911A: Enhanced Swift-XRT position
  74. GRB 120911A: Faulkes Telescope North observations
  75. GRB 120911A: Swift-XRT observations
  76. GRB 120911A: Swift detection of a burst
  77. GRB 120907A: SMA upper limits
  78. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  79. GRB 120908A: Fermi GBM detection
  80. GRB 120908A: Swift Observations
  81. GRB 120909A: TAROT La Silla observatory optical observations
  82. GRB 120909A: Fermi GBM observation
  83. Konus-Wind observation of GRB 120909A
  84. GRB 120909A: Swift/UVOT Detection
  85. GRB 120909A: Swift-XRT refined Analysis
  86. GRB 120909A: Swift-BAT refined analysis
  87. GRB 120909A: Enhanced Swift-XRT position
  88. GRB 120908A: MAXI/GSC detection
  89. GRB 120909A: X-Shooter redshift 3.93
  90. GRB 120909A: GROND detection of the afterglow
  91. Skynet/PROMPT Observations of GRB120909A
  92. GRB 120909A: Swift detection of a burst
  93. GRB 120907A: EVLA observations
  94. GRB 120907A: Swift/UVOT Detection
  95. GRB 120907A: Swift-XRT refined Analysis
  96. GRB 120907A: Spectroscopy from OSIRIS/GTC
  97. GRB 120907A: Enhanced Swift-XRT position
  98. GRB 120907A: Fermi GBM detection
  99. GRB 120907A: Swift-BAT refined analysis
  100. GRB 120907A: NOT optical observations

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