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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"

20521 results found.

  1. GRB 130122A: Swift detection of a burst with an optical counterpart
  2. Short GRB 121226A: TNG observation of the host galaxy
  3. GRB 130102B: MASTER synchronous observations
  4. GRB 130102A: Swift/UVOT Upper Limits
  5. GRB 130102A: P60 Observations
  6. GRB 130102A: Swift-XRT refined Analysis
  7. GRB 130102B: MAXI/GSC detection
  8. GRB 130102A: Enhanced Swift-XRT position
  9. GRB 130102A: Swift detection of a burst
  10. GRB 121229A: Swift/UVOT Upper Limits
  11. GRB 121229A: Enhanced Swift-XRT position
  12. GRB 121229A: VLT/X-shooter redshift
  13. Swift Trigger 544381 is unlikely to be a GRB
  14. GRB 121229A: GROND detection of the afterglow
  15. Skynet/PROMPT observations of GRB121229a
  16. GRB 121229A: Swift detection of a burst
  17. GRB 121226A: Swift/UVOT Upper Limits
  18. GRB 121226A: Swift-XRT refined Analysis
  19. GRB 121226A: NOT optical upper limit
  20. GRB 121226A: Optical Observations
  21. GRB 121226A: MITSuME Okayama Optical upper limits
  22. GRB 121226A: Zadko observatory - Gingin optical observations
  23. GRB 121226A: BOOTES-4/MET optical observations
  24. GRB 121226A: Swift detection of a burst
  25. GRB 121225B: Fermi LAT Detection
  26. GRB 121225A: MAXI/GSC detection
  27. GRB 121217A: Swift/UVOT Detection
  28. GRB 121217A: GROND Detection of the Afterglow
  29. GRB 121217A: Enhanced Swift-XRT position
  30. GRB 121217A: Swift detection of a burst
  31. GRB 121209A: LOAO Observation
  32. GRB 121209A: Swift/UVOT Upper Limits
  33. GRB121212A: NOT optical imaging
  34. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  35. GRB 121212A: Maidanak optical observations
  36. GRB 121211A: RATIR Optical and NIR Observations
  37. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  38. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  39. GRB 121212A: PAIRITEL NIR Observations
  40. GRB 121212A: P60 Observations
  41. GRB 121212A: optical observations in ISON-NM observatory
  42. GRB121212A: Swift/UVOT Detection
  43. GRB 121212A: Enhanced Swift-XRT position
  44. GRB 121212A: Swift detection of a burst
  45. GRB 121211A: Swift/UVOT Detection
  46. GRB 121211A: MITSuME Okayama Optical Observation
  47. GRB 121211A: Enhanced Swift-XRT position
  48. GRB 121211A: Swift detection of a burst with an optical counterpart
  49. GRB 121209A: Enhanced Swift-XRT position
  50. GRB 121209A: GROND optical afterglow candidate
  51. GRB 121209A: Gemini-South imaging
  52. GRB 121209A: PAIRITEL NIR Observations
  53. GRB 121209A: Swift detection of a burst
  54. GRB 121128A: Optical Observations
  55. GRB 121202A: Swift/UVOT Upper Limits
  56. GRB 121202A: Enhanced Swift-XRT position
  57. GRB 121202A: Swift-XRT observations
  58. GRB121202A: Swift/UVOT Observations
  59. GRB 121202A: TAROT Calern observatory optical observations
  60. GRB 121201A: GROND afterglow observations and photometric redshift
  61. GRB 121201A: Swift/UVOT Detection
  62. GRB 121201A: Swift-BAT refined analysis
  63. GRB 121201A: Enhanced Swift-XRT position
  64. GRB 121201A: BOOTES-4 optical observations
  65. GRB 121201A: a GRB with an optical counterpart
  66. GRB 121128A: optical observation in Mondy observatory
  67. GRB 121125A: optical upper limit
  68. GRB 121128A: optical observation in Mondy observatory
  69. GRB 121128A: Swift/UVOT Detection
  70. GRB 121128A: Enhanced Swift-XRT position
  71. GRB 121122A: Fermi GBM observation
  72. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  73. GRB 121128A, Swift-BAT refined analysis
  74. Konus-Wind observation of GRB 121128A
  75. GRB 121128A: Swift detection of a burst with an optical counterpart
  76. Konus-Wind observation of GRB 121122A
  77. GRB 121117A: Terskol obseravtions
  78. GRB 121123A: Swift/UVOT Observations
  79. GRB 121125A: Swift/UVOT Detection
  80. IPN Triangulation of GRB 121122A (long/intense)
  81. GRB 121125A: Enhanced Swift-XRT position
  82. GRB 121125A: LOAO Observation
  83. GRB 121125A: Swift detection of a burst with optical counterpart
  84. GRB 121123A: GROND observations
  85. GRB 121123A: Enhanced Swift-XRT position
  86. GRB 121123A: optical observations
  87. GRB 121123A: BOOTES-4 and IAC80 optical observations
  88. GRB 121123A: NOT optical observations
  89. GRB 121123A: MASTER-NET optical limit
  90. GRB 121123A: GMG optical observation
  91. GRB 121123A: Swift detection of a burst with optical counterpart
  92. GRB 121108A: optical upper limit
  93. GRB 121117A: Optical observations
  94. GRB 121117A: optical upper limit
  95. IPN Triangulation of GRB 121118B (long/intense)
  96. GRB 121117A: GROND confirmation of the UVOT afterglow candidate
  97. GRB 121117A: Swift/UVOT Observations
  98. GRB 121117A: Swift-XRT refined Analysis
  99. GRB 121117A: BOOTES-3 early optical upper limit
  100. GRB 121117A: Swift detection of a burst

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