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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"

36404 results found.

  1. GRB 121226A: Zadko observatory - Gingin optical observations
  2. GRB 121226A: BOOTES-4/MET optical observations
  3. GRB 121226A: Swift detection of a burst
  4. Konus-Wind observation of GRB 121225B
  5. IPN Triangulation of GRB 121225B
  6. GRB 121225B: Fermi GBM observation
  7. GRB 121225B: Fermi LAT Detection
  8. GRB 121225A: MAXI/GSC detection
  9. GRB 121217A: ATCA 44GHz upper limit
  10. GRB 121217A: Swift-BAT refined analysis
  11. GRB 121217A theoretical estimate of redshift and of supernova occurrence
  12. GRB 121217A: Fermi GBM observation
  13. GRB 121217A: Swift-XRT refined Analysis
  14. GRB 121217A: Swift/UVOT Detection
  15. GRB 121217A: GROND Detection of the Afterglow
  16. GRB 121217A: Enhanced Swift-XRT position
  17. GRB 121217A: Swift detection of a burst
  18. GRB 121123A: NIKA (New IRAM KID Arrays) millimetre observations at the 30-m Pico Veleta telescope
  19. GRB 121209A: LOAO Observation
  20. GRB 121209A: Swift/UVOT Upper Limits
  21. GRB 121212A: LOAO IzY Observation
  22. GRB 121209A: MAXI/GSC detection
  23. GRB 121212A: PdBI mm observations
  24. GRB121212A: NOT optical imaging
  25. GRB 121209A: Early CARMA Observations
  26. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  27. GRB 121212A: Maidanak optical observations
  28. GRB 121211A: Fermi GBM observation
  29. GRB 121211A: RATIR Optical and NIR Observations
  30. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  31. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  32. GRB 121212A: PAIRITEL NIR Observations
  33. GRB 121212A: Swift-XRT refined Analysis
  34. GRB 121212A: P60 Observations
  35. GRB 121212A: optical observations in ISON-NM observatory
  36. GRB 121212A: Keck observations
  37. GRB121212A: Swift/UVOT Detection
  38. GRB 121212A: Swift-BAT refined analysis
  39. GRB 121211A: Swift-BAT refined analysis
  40. GRB 121212A: Enhanced Swift-XRT position
  41. GRB 121212A: A long GRB detected by INTEGRAL
  42. GRB 121212A: Swift detection of a burst
  43. GRB 121211A: Swift/UVOT Detection
  44. GRB 121211A: MITSuME Okayama Optical Observation
  45. GRB 121211A: Swift-XRT refined Analysis
  46. GRB 121211A: Enhanced Swift-XRT position
  47. GRB 121211A: Keck/LRIS redshift
  48. GRB 121211A - Faulkes Telescope North afterglow confirmation
  49. GRB 121211A: Swift detection of a burst with an optical counterpart
  50. GRB 121209A: Keck observations
  51. GRB 121209A: CARMA 3mm Observations
  52. GRB 121209A: EVLA Observations
  53. GRB 121209A: Swift-XRT refined Analysis
  54. GRB 121209A: Swift-BAT refined analysis
  55. GRB 121209A: Enhanced Swift-XRT position
  56. GRB121209A: RATIR Optical and NIR Upper Limits
  57. GRB 121209A: GROND optical afterglow candidate
  58. GRB 121209A: Gemini-South imaging
  59. GRB 121209A: PAIRITEL NIR Observations
  60. GRB 121209A: UVOT Observation
  61. GRB 121209A: Swift detection of a burst
  62. GRB 121127A: Suzaku WAM observation of the prompt emission
  63. GRB 121128A: Optical Observations
  64. GRB 121122A: Suzaku WAM observation of the prompt emission
  65. GRB 121202A: Swift/UVOT Upper Limits
  66. GRB 121202A: Swift-XRT refined Analysis
  67. GRB 121202A: Fermi GBM observation
  68. GRB 121202A: Enhanced Swift-XRT position
  69. GRB 121202A: Swift-BAT refined analysis
  70. GRB 121202A: Swift-XRT observations
  71. GRB 121201A: X-shooter redshift
  72. GRB121202A: Swift/UVOT Observations
  73. GRB 121202A: TAROT Calern observatory optical observations
  74. GRB 121202A: Swift detection of a burst
  75. GRB 121201A: GROND afterglow observations and photometric redshift
  76. GRB 121201A: Swift/UVOT Detection
  77. GRB 121201A: Swift-XRT refined Analysis
  78. GRB 121201A: Swift-BAT refined analysis
  79. GRB 121201A: Enhanced Swift-XRT position
  80. GRB 121201A: BOOTES-4 optical observations
  81. GRB 121201A: a GRB with an optical counterpart
  82. GRB 121128A: optical observation in Mondy observatory
  83. GRB 121128A: MITSuME Akeno Optical upper limits
  84. Konus-Wind observation of GRB 121127A
  85. IPN Triangulation of GRB 121127A (short/hard)
  86. GRB 121125A: optical upper limit
  87. GRB 121128A: optical observation in Mondy observatory
  88. GRB 121128A: WSRT radio observation
  89. GRB 121128A: Swift/UVOT Detection
  90. GRB 121128A: Swift-XRT refined Analysis
  91. GRB 121128A: Enhanced Swift-XRT position
  92. GRB 121122A: Fermi GBM observation
  93. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  94. GRB 121128A: Fermi GBM observation
  95. GRB 121128A, Swift-BAT refined analysis
  96. Konus-Wind observation of GRB 121128A
  97. GRB 121128A - Gemini North redshift
  98. GRB 121128A: FTN optical afterglow confirmation
  99. GRB 121128A: Swift detection of a burst with an optical counterpart
  100. GRB 121123A: Suzaku WAM observation of the prompt emission

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