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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"

23561 results found.

  1. GRB 121211A: RATIR Optical and NIR Observations
  2. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  3. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  4. GRB 121212A: PAIRITEL NIR Observations
  5. GRB 121212A: P60 Observations
  6. GRB 121212A: optical observations in ISON-NM observatory
  7. GRB121212A: Swift/UVOT Detection
  8. GRB 121212A: Swift-BAT refined analysis
  9. GRB 121212A: Enhanced Swift-XRT position
  10. GRB 121212A: Swift detection of a burst
  11. GRB 121211A: Swift/UVOT Detection
  12. GRB 121211A: MITSuME Okayama Optical Observation
  13. GRB 121211A: Enhanced Swift-XRT position
  14. GRB 121211A: Swift detection of a burst with an optical counterpart
  15. GRB 121209A: CARMA 3mm Observations
  16. GRB 121209A: Enhanced Swift-XRT position
  17. GRB121209A: RATIR Optical and NIR Upper Limits
  18. GRB 121209A: GROND optical afterglow candidate
  19. GRB 121209A: Gemini-South imaging
  20. GRB 121209A: PAIRITEL NIR Observations
  21. GRB 121209A: UVOT Observation
  22. GRB 121209A: Swift detection of a burst
  23. GRB 121128A: Optical Observations
  24. GRB 121202A: Swift/UVOT Upper Limits
  25. GRB 121202A: Swift-XRT refined Analysis
  26. GRB 121202A: Enhanced Swift-XRT position
  27. GRB 121202A: Swift-XRT observations
  28. GRB121202A: Swift/UVOT Observations
  29. GRB 121202A: TAROT Calern observatory optical observations
  30. GRB 121202A: Swift detection of a burst
  31. GRB 121201A: GROND afterglow observations and photometric redshift
  32. GRB 121201A: Swift/UVOT Detection
  33. GRB 121201A: Swift-XRT refined Analysis
  34. GRB 121201A: Swift-BAT refined analysis
  35. GRB 121201A: Enhanced Swift-XRT position
  36. GRB 121201A: a GRB with an optical counterpart
  37. GRB 121128A: optical observation in Mondy observatory
  38. IPN Triangulation of GRB 121127A (short/hard)
  39. GRB 121125A: optical upper limit
  40. GRB 121128A: optical observation in Mondy observatory
  41. GRB 121128A: Swift/UVOT Detection
  42. GRB 121128A: Swift-XRT refined Analysis
  43. GRB 121128A: Enhanced Swift-XRT position
  44. GRB 121122A: Fermi GBM observation
  45. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  46. GRB 121128A: Swift detection of a burst with an optical counterpart
  47. GRB 121117A: Terskol obseravtions
  48. GRB 121123A: Swift/UVOT Observations
  49. GRB 121125A: Swift/UVOT Detection
  50. IPN Triangulation of GRB 121122A (long/intense)
  51. GRB 121118B: Suzaku WAM observation of the prompt emission
  52. GRB 121125A: Enhanced Swift-XRT position
  53. GRB 121125A: Fermi GBM Observation
  54. GRB 121125A: LOAO Observation
  55. GRB 121125A: Swift detection of a burst with optical counterpart
  56. GRB 121123A: GROND observations
  57. GRB 121123A: Enhanced Swift-XRT position
  58. GRB 121123A: optical observations
  59. GRB 121123A: NOT optical observations
  60. GRB 121123A: Fermi GBM observation
  61. GRB 121123A: MASTER-NET optical limit
  62. GRB 121123A: GMG optical observation
  63. GRB 121123A: Swift detection of a burst with optical counterpart
  64. GRB 121108A: optical upper limit
  65. GRB 121117A: Optical observations
  66. GRB 121117A: optical upper limit
  67. IPN Triangulation of GRB 121118B (long/intense)
  68. GRB 121117A: GROND confirmation of the UVOT afterglow candidate
  69. IPN Triangulation of GRB 121118A
  70. GRB 121117A: Swift/UVOT Observations
  71. GRB 121117A: Swift-XRT refined Analysis
  72. GRB 121117A: ROTSE-III Optical Limits
  73. GRB 121117A: BOOTES-3 early optical upper limit
  74. GRB 121117A: Swift detection of a burst
  75. Trigger 538084: Swift detection of XTE J1739-302
  76. GRB 121108A: Swift/UVOT Upper Limits
  77. GRB 121108A: Xinglong TNT upper limit
  78. GRB 121108A: Enhanced Swift-XRT position
  79. GRB 121108A : Lulin/TRIPOL2 Optical Limits
  80. GRB 121108A: Optical observations
  81. GRB 121108A: MITSuME Ishigakijima upper limits
  82. GRB 121108A: Weihai observatory optical observations
  83. GRB 121108A: TAROT Calern observatory optical observations
  84. GRB 121108A: Swift detection of a burst
  85. GRB 121028A: Swift/UVOT Upper Limits
  86. GRB 121102A: Swift/UVOT Upper Limits
  87. GRB 121031A: Swift/UVOT Upper Limits
  88. GRB 121102A: Enhanced Swift-XRT position
  89. GRB 121031A: Enhanced Swift-XRT position
  90. GRB 121102A: Swift-XRT refined Analysis
  91. GRB 121102A: Swift detection of a burst
  92. GRB 121027A: sub-mm upper limit
  93. GRB 121031A: Swift detection of a burst
  94. GRB 121027A: Swift/UVOT Possible Detection
  95. GRB 121024A: LOAO RIzY Observation
  96. GRB 121024A: SMARTS optical/IR afterglow observations
  97. GRB 121027A: GROND Confirmation of Rebrightening
  98. GRB 121029A: Fermi GBM detection
  99. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  100. GRB 121027A: MASTER early prompt optical limit

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