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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"

27947 results found.

  1. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  2. GRB 121217A: Swift-BAT refined analysis
  3. GRB 121217A: Fermi GBM observation
  4. GRB 121217A: Swift-XRT refined Analysis
  5. GRB 121217A: Swift/UVOT Detection
  6. GRB 121217A: GROND Detection of the Afterglow
  7. GRB 121217A: Enhanced Swift-XRT position
  8. GRB 121217A: Swift detection of a burst
  9. GRB 121209A: LOAO Observation
  10. GRB 121209A: Swift/UVOT Upper Limits
  11. GRB 121212A: LOAO IzY Observation
  12. GRB 121209A: MAXI/GSC detection
  13. GRB121212A: NOT optical imaging
  14. GRB 121212A: Maidanak optical observations
  15. GRB 121211A: Fermi GBM observation
  16. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  17. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  18. GRB 121212A: PAIRITEL NIR Observations
  19. GRB 121212A: Swift-XRT refined Analysis
  20. GRB 121212A: P60 Observations
  21. GRB 121212A: optical observations in ISON-NM observatory
  22. GRB 121212A: Keck observations
  23. GRB121212A: Swift/UVOT Detection
  24. GRB 121212A: Swift-BAT refined analysis
  25. GRB 121211A: Swift-BAT refined analysis
  26. GRB 121212A: Enhanced Swift-XRT position
  27. GRB 121212A: A long GRB detected by INTEGRAL
  28. GRB 121212A: Swift detection of a burst
  29. GRB 121211A: Swift/UVOT Detection
  30. GRB 121211A: Swift-XRT refined Analysis
  31. GRB 121211A: Enhanced Swift-XRT position
  32. GRB 121211A: Keck/LRIS redshift
  33. GRB 121211A: Swift detection of a burst with an optical counterpart
  34. GRB 121209A: Keck observations
  35. GRB 121209A: CARMA 3mm Observations
  36. GRB 121209A: EVLA Observations
  37. GRB 121209A: Swift-XRT refined Analysis
  38. GRB 121209A: Swift-BAT refined analysis
  39. GRB 121209A: Enhanced Swift-XRT position
  40. GRB 121209A: GROND optical afterglow candidate
  41. GRB 121209A: PAIRITEL NIR Observations
  42. GRB 121209A: UVOT Observation
  43. GRB 121209A: Swift detection of a burst
  44. GRB 121127A: Suzaku WAM observation of the prompt emission
  45. GRB 121128A: Optical Observations
  46. GRB 121122A: Suzaku WAM observation of the prompt emission
  47. GRB 121202A: Swift/UVOT Upper Limits
  48. GRB 121202A: Swift-XRT refined Analysis
  49. GRB 121202A: Fermi GBM observation
  50. GRB 121202A: Enhanced Swift-XRT position
  51. GRB 121202A: Swift-BAT refined analysis
  52. GRB 121202A: Swift-XRT observations
  53. GRB121202A: Swift/UVOT Observations
  54. GRB 121202A: TAROT Calern observatory optical observations
  55. GRB 121202A: Swift detection of a burst
  56. GRB 121201A: GROND afterglow observations and photometric redshift
  57. GRB 121201A: Swift/UVOT Detection
  58. GRB 121201A: Swift-XRT refined Analysis
  59. GRB 121201A: Swift-BAT refined analysis
  60. GRB 121201A: Enhanced Swift-XRT position
  61. GRB 121201A: a GRB with an optical counterpart
  62. GRB 121128A: optical observation in Mondy observatory
  63. IPN Triangulation of GRB 121127A (short/hard)
  64. GRB 121128A: optical observation in Mondy observatory
  65. GRB 121128A: Swift/UVOT Detection
  66. GRB 121128A: Swift-XRT refined Analysis
  67. GRB 121128A: Enhanced Swift-XRT position
  68. GRB 121122A: Fermi GBM observation
  69. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  70. GRB 121128A: Fermi GBM observation
  71. GRB 121128A, Swift-BAT refined analysis
  72. Konus-Wind observation of GRB 121128A
  73. GRB 121128A: Swift detection of a burst with an optical counterpart
  74. GRB 121123A: Suzaku WAM observation of the prompt emission
  75. Konus-Wind observation of GRB 121122A
  76. GRB 121123A: Swift/UVOT Observations
  77. GRB 121125A: Swift/UVOT Detection
  78. IPN Triangulation of GRB 121122A (long/intense)
  79. GRB 121125A: Swift-XRT refined Analysis
  80. GRB 121125A: Enhanced Swift-XRT position
  81. GRB 121125A: Fermi GBM Observation
  82. GRB 121125A: Swift-BAT refined analysis
  83. GRB 121125A: MASTER-NET optical observations
  84. GRB 121125A: Swift detection of a burst with optical counterpart
  85. GRB 121123A: GROND observations
  86. GRB 121123A: Enhanced Swift-XRT position
  87. GRB 121123A: Swift-BAT refined analysis
  88. GRB 121123A: Swift-XRT refined Analysis
  89. GRB 121123A: optical observations
  90. GRB 121123A: Fermi GBM observation
  91. GRB 121123A: MASTER-NET optical limit
  92. GRB 121123A: Swift detection of a burst with optical counterpart
  93. GRB 121108A: optical upper limit
  94. Konus-Wind observation of GRB 121118B
  95. IPN Triangulation of GRB 121118B (long/intense)
  96. GRB 121117A: GROND confirmation of the UVOT afterglow candidate
  97. Swift-BAT trigger 538575 is not astrophysical
  98. GRB 121117A: Swift/UVOT Observations
  99. GRB 121117A: Swift-XRT refined Analysis
  100. GRB 121117A: MASTER prompt optical limit

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