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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"

23445 results found.

  1. GRB 121024A: PAIRITEL NIR Detection
  2. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  3. Skynet PROMPT/Dolomiti observations of GRB121024A
  4. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  5. GRB 121024A: Swift detection of a burst with an optical counterpart
  6. Swift Trigger 536502 is likely a noise fluctuation in coincidence with SAX J1818.6-1703
  7. GRB 121017A: Swift/UVOT Upper Limits
  8. GRB 121017A: Swift-XRT refined Analysis
  9. GRB 121017A: GROND Observations
  10. GRB 121017A: Swift-BAT refined analysis
  11. GRB 121017A: Enhanced Swift-XRT position
  12. GRB 121017A: 1.23m CAHA R-band observations
  13. GRB 121017A optical observations
  14. GRB 121017A: BOOTES-2/TELMA observations
  15. GRB 121017A: Swift detection of a burst
  16. GRB 121012A: Fermi GBM detection
  17. GRB 121014A: Swift-BAT refined analysis
  18. GRB 121014A: Swift detection of a burst
  19. GRB 121011A: Swift/UVOT Detection
  20. IPN Triangulation of short hard GRB 121011B
  21. GRB 121011A: Fermi-LAT detection of a burst
  22. GRB 121011A: optical observations
  23. GRB 121011A: Enhanced Swift-XRT position
  24. GRB 121011A: MITSuME Okayama Optical Observation
  25. GRB 121011A: Swift detection of a burst with optical afterglow
  26. Trigger 535747: Swift detection of an outburst from SGR1806-20
  27. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  28. GRB 120927A: optical upper limit
  29. GRB 120804A: Late-time Chandra observation
  30. GRB 121001A: GROND Afterglow Confirmation
  31. GRB 121001A: Swift/UVOT Upper Limits
  32. GRB 121001A: Swift-XRT refined Analysis
  33. GRB 121001A: Enhanced Swift-XRT Position
  34. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  35. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  36. GRB 121001A: possible optical counterpart
  37. Swift Trigger 535026: ROTSE-III Optical Limits
  38. Swift Trigger 535026: Galactic Transient or possible GRB
  39. GRB 120927A: Swift/UVOT Upper Limits
  40. GRB 120927A: GROND upper limits
  41. GRB 120927A: Swift-XRT refined Analysis
  42. GRB 120927A: Enhanced Swift-XRT position
  43. GRB 120923A: JHK Observation
  44. GRB 120927A: Swift detection of a burst
  45. Further Swift-XRT observations of the GRB 120919A field.
  46. GRB 120923A: optical upper limit
  47. GRB 120921A: Fermi GBM detection of its 1000th GRB
  48. GRB 120923A: RAPTOR Early Afterglow Limits
  49. GRB 120923A: MITSuME Okayama Optical upper limits
  50. GRB 120916A Suzaku WAM observation of the prompt emission
  51. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  52. GRB 120923A: CARMA Observations
  53. GRB 120923A: EVLA Observations
  54. GRB 120923A: GROND Upper limits
  55. GRB 120922A: GROND photometric redshift
  56. GRB 120922A: Swift/UVOT Detection
  57. GRB 120923A: Swift/UVOT Upper Limit
  58. GRB 120923A: Gemini afterglow detection, high-z candidate
  59. GRB 120923A: Enhanced Swift-XRT position
  60. GRB 120922A: Enhanced Swift-XRT position
  61. GRB 120922A: TAROT La Silla observatory optical observations
  62. GRB 120923A: TAROT La Silla observatory optical observations
  63. GRB 120923A: ROTSE-III Optical Limits
  64. GRB 120923A: Swift detection of a burst
  65. GRB 120922A: GROND afterglow candidate
  66. GRB 120922A: Swift detection of a burst
  67. GRB 120919B: MASTER prompt optical observations
  68. GRB 120919A: Swift/UVOT Upper Limits
  69. IPN Triangulation of long GRB 120919B
  70. IPN Triangulation of long GRB 120919A
  71. GRB 120919A: Fermi GBM detection
  72. Swift trigger 534017 was not an astrophysical event
  73. GRB 120916A: Fermi GBM Observation
  74. Swift Trigger 534017 is probably not real.
  75. GRB 120918A: Swift detection of a burst
  76. IPN Triangulation of long GRB 120916A
  77. Swift Trigger 533836 is a new Galactic transient
  78. GRB 120913B: REM NIR early time detection
  79. Continued Skynet/PROMPT observations of GRB120913B
  80. GRB 120913B: TAROT La Silla observatory optical detection
  81. Skynet/PROMPT observations of GRB120913B
  82. GRB 120913B: Swift detection of a burst
  83. GRB 120913A: Swift detection of a burst
  84. GRB 120907A: optical observations of ISON-Kislovodsk
  85. GRB 120911A: optical upper limit CrAO
  86. GRB 120911A: optical upper limit ISON-NM
  87. GRB 120911B: Fermi-LAT detection of a burst
  88. IPN Triangulation of GRB 120911B (long/bright)
  89. GRB120911A: MITSuME Okayama Optical upper limits
  90. GRB 120911A: Fermi/LAT upper limit
  91. GRB 120911A: Swift/UVOT Upper Limits
  92. GRB 120911A: Enhanced Swift-XRT position
  93. GRB 120911A: Swift-XRT observations
  94. GRB 120911A: ROTSE-III Optical Limits
  95. GRB 120911A: Swift detection of a burst
  96. GRB 120907A: SMA upper limits
  97. GRB 120908A: Swift Observations
  98. GRB 120909A: TAROT La Silla observatory optical observations
  99. GRB 120909A: Pi of the Sky upper limits
  100. Konus-Wind observation of GRB 120909A

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