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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"

37682 results found.

  1. GRB 121001A: MASTER optical observations
  2. GRB 121001A: possible optical counterpart
  3. Swift Trigger 535026: Galactic Transient or possible GRB
  4. GRB 120927A: Swift/UVOT Upper Limits
  5. GRB 120927A, Swift-BAT refined analysis
  6. GRB 120927A: GROND upper limits
  7. GRB 120927A: Swift-XRT refined Analysis
  8. GRB 120923A: Correction to GCN 13823
  9. GRB 120927A: Enhanced Swift-XRT position
  10. GRB 120923A: JHK Observation
  11. GRB 120927A: Swift detection of a burst
  12. Further Swift-XRT observations of the GRB 120919A field.
  13. GRB 120923A: optical upper limit
  14. GRB 120921A: Fermi GBM detection of its 1000th GRB
  15. GRB 120923A: RAPTOR Early Afterglow Limits
  16. GRB 120923A: MITSuME Okayama Optical upper limits
  17. GRB 120916A Suzaku WAM observation of the prompt emission
  18. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  19. GRB 120923A: CARMA Observations
  20. GRB 120923A: EVLA Observations
  21. GRB 120923A: Swift-XRT refined Analysis
  22. GRB 120923A: GROND Upper limits
  23. GRB 120922A: GROND photometric redshift
  24. GRB 120922A: Fermi GBM detection
  25. GRB 120922A: Swift/UVOT Detection
  26. GRB 120923A: Swift-BAT refined analysis
  27. GRB 120922A: Swift-BAT refined analysis
  28. GRB 120923A: Swift/UVOT Upper Limit
  29. GRB 120922A: Swift-XRT refined Analysis
  30. GRB 120922A: Swift/UVOT Observations
  31. GRB 120923A: Gemini afterglow detection, high-z candidate
  32. GRB 120923A: Enhanced Swift-XRT position
  33. GRB 120922A: Enhanced Swift-XRT position
  34. GRB 120922A: TAROT La Silla observatory optical observations
  35. GRB 120923A: TAROT La Silla observatory optical observations
  36. GRB 120923A: ROTSE-III Optical Limits
  37. GRB 120923A: Swift detection of a burst
  38. GRB 120922A: GROND afterglow candidate
  39. GRB 120922A: Prompt enhanced Swift-XRT position
  40. GRB 120922A: Swift detection of a burst
  41. GRB 120919B: MASTER prompt optical observations
  42. GRB 120919A: Swift/UVOT Upper Limits
  43. GRB 120919A: Swift-XRT observations
  44. Konus-Wind observation of GRB 120919B
  45. IPN Triangulation of long GRB 120919B
  46. Konus-Wind observation of GRB 120919A
  47. IPN Triangulation of long GRB 120919A
  48. GRB 120919A: Fermi GBM detection
  49. GRB 120918A: Swift-BAT refined analysis
  50. GRB 120916A: Fermi GBM Observation
  51. Konus-Wind observation of GRB 120916A
  52. GRB 120918A: Swift detection of a burst
  53. IPN Triangulation of long GRB 120916A
  54. GRB 120916A: Fermi-LAT detection of a burst
  55. Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A
  56. GRB 120913B: Fermi GBM observation
  57. GRB 120913B: Swift-BAT refined analysis
  58. GRB 120913A: Fermi GBM observation
  59. GRB 120913B: FRAM early follow up and detection
  60. GRB 120913A: Swift-BAT refined analysis
  61. GRB 120913B: REM NIR early time detection
  62. Continued Skynet/PROMPT observations of GRB120913B
  63. GRB 120913B: TAROT La Silla observatory optical photometry
  64. GRB 120913B: TAROT La Silla observatory optical detection
  65. GRB 120913B: Swift detection of a burst
  66. GRB 120913A: Swift detection of a burst
  67. GRB 120907A: optical observations of ISON-Kislovodsk
  68. GRB 120911A: optical upper limit CrAO
  69. GRB 120911A: optical upper limit ISON-NM
  70. Konus-Wind observation of GRB 120911B
  71. GRB 120911B: Fermi GBM observation
  72. GRB 120911B: Fermi-LAT detection of a burst
  73. IPN Triangulation of GRB 120911B (long/bright)
  74. GRB 120911A: Fermi GBM observation
  75. GRB120911A: MITSuME Okayama Optical upper limits
  76. GRB 120911A: Fermi/LAT upper limit
  77. GRB 120911A: Swift/UVOT Upper Limits
  78. GRB 120911A: Swift-XRT refined Analysis
  79. GRB 120911A: Swift-BAT refined analysis
  80. GRB 120911A: Enhanced Swift-XRT position
  81. GRB 120911A: Faulkes Telescope North observations
  82. GRB 120911A: Swift-XRT observations
  83. GRB 120911A: ROTSE-III Optical Limits
  84. GRB 120911A: Swift detection of a burst
  85. GRB 120907A: SMA upper limits
  86. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  87. GRB 120908A: Fermi GBM detection
  88. GRB 120908A: Swift Observations
  89. GRB 120909A: TAROT La Silla observatory optical observations
  90. GRB 120909A: Pi of the Sky upper limits
  91. GRB 120909A: Fermi GBM observation
  92. Konus-Wind observation of GRB 120909A
  93. GRB 120909A: Swift/UVOT Detection
  94. GRB 120909A: Swift-XRT refined Analysis
  95. GRB 120909A: Swift-BAT refined analysis
  96. GRB 120909A: Enhanced Swift-XRT position
  97. GRB 120908A: MAXI/GSC detection
  98. GRB 120909A: X-Shooter redshift 3.93
  99. GRB 120909A: GROND detection of the afterglow
  100. GRB 120909A: Swift detection of a burst

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