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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19349 results found.

  1. GRB 110315A: MASTER early optical observations
  2. GRB 110315A: Swift detection of a burst
  3. GRB 110312A: Swift/UVOT Upper Limits
  4. GRB 110312A: Swift-XRT refined Analysis
  5. GRB 110312A: GROND Upper Limits
  6. GRB 110312A: Enhanced Swift-XRT position
  7. GRB 110312A: Swift-BAT refined analysis
  8. GRB 110312A: Swift detection of a burst
  9. GRB 110305A: Swift/UVOT Upper Limits
  10. GRB 110305A: Swift-XRT refined Analysis
  11. GRB 110305A: Enhanced Swift-XRT position
  12. GRB 110305A: Swift-BAT refined analysis
  13. GRB 110305A: GROND Detection of Optical Afterglow
  14. GRB 110305A: Swift detection of a burst
  15. GRB 110223A: optical upper limits
  16. Swift/UVOT observations of GRB110223A
  17. No IPN GRB detected in conjunction with candidate GRB 110215
  18. GRB GRB 110223A: MASTER VWF early optical observations
  19. Swift/UVOT observations of GRB110223b
  20. GRB 110223A: Swift-BAT refined analysis
  21. GRB 110223A: Swift-XRT refined Analysis
  22. GRB 110223B: Swift-XRT refined Analysis
  23. GRB 110223A: Enhanced Swift-XRT position
  24. GRB 110223B: Enhanced Swift-XRT position
  25. GRB 110223B: Swift-BAT refined analysis
  26. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  27. GRB 110223B: Swift detection of a burst
  28. GRB 110223A: Swift detection of a burst
  29. GRB 110213B: Swift/UVOT observations
  30. GRB110213B: X-ray afterglow confirmation
  31. Fermi GBM detection of an SGR-like burst
  32. Swift XRT and UVOT Observations of OT 110215
  33. GRB 110213A: optical observations in CrAO
  34. GRB 110213A: optical observations in Mondy
  35. Swift/UVOT observations of GRB110210a.
  36. GRB 110210A: optical upper limit
  37. GRB 110210A: ROVOR Upper Limit
  38. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  39. GRB 110212A: Swift XRT and UVOT observations
  40. Swift GRB110213A: interesting behaviour
  41. GRB 110213A: Fermi GBM observation
  42. GRB 110205A: Konkoly optical observations
  43. GRB 110213B: Swift XRT observation
  44. Konus-Wind observation of GRB 110213A
  45. GRB 110213A: Swift-XRT refined Analysis
  46. GRB 110213A: Swift/UVOT refined analysis
  47. GRB 110213A: Lightbuckets Optical Observations
  48. GRB 110213A, Swift-BAT refined analysis
  49. GRB 110213A: optical observations
  50. GRB 110213A: Enhanced Swift-XRT position
  51. GRB 110213A: Bok Telescope Redshift
  52. GRB 110213A: ROTSE-III Detection of Optical Counterpart
  53. GRB 110213A: Swift detection of a burst with optical afterglow
  54. GRB 110212A: GRT Optical Observation
  55. GRB 110212A, Swift-BAT refined analysis
  56. GRB 110212A: ROTSE-III Optical Limits
  57. GRB 110212A: Swift detection of a burst
  58. GRB 110207A: Suzaku WAM observation of the prompt emission
  59. GRB 110210A: Swift-XRT refined Analysis
  60. GRB 110205A: Swift/BAT and Suzaku/WAM joint spectral analysis
  61. GRB 110210A: Swift-BAT refined analysis
  62. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  63. GRB 110210A: Enhanced Swift-XRT position
  64. GRB 110201A: optical observations
  65. GRB 110210A: Swift detection of a burst
  66. GRB 110206A: Swift-XRT confirmation of the X-ray afterglow
  67. Fermi GBM detection of a burst from 1E 1841-045
  68. Swift/UVOT observations of GRB110208a
  69. GRB 110205A: Suzaku WAM observation of the prompt emission
  70. GRB 110207A: Swift-XRT observations
  71. GRB 110208A: Swift-XRT refined Analysis
  72. GRB 110208A: Enhanced Swift-XRT position
  73. GRB 110208A: Swift-BAT refined analysis
  74. GRB 110208A: Swift detection of a burst
  75. SGR-like outburst from the magnetar 1E 1841-04.5
  76. GRB 110205A: optical observations in Mondy observatory
  77. GRB 110207A: Fermi GBM observation
  78. GRB 110205A : HCT optical observations
  79. GRB 110207A: TAROT Calern observatory optical observations
  80. GRB 110207A: Swift-BAT refined analysis
  81. GRB 110206A: UVOT detection of afterglow candidate
  82. GRB 110207A: MASTER prompt and early optical observations
  83. Konus-Wind observation of GRB 110205A
  84. GRB 110207A: Swift detection of a burst
  85. GRB 110206A: Swift detection of a probable X-ray afterglow
  86. GRB 110205A: Lightbuckets Optical Observations
  87. GRB 110205A: Swift/UVOT Continuing Observations
  88. Observations GRB 110205A
  89. GRB 110205A: Swift-BAT refined analysis
  90. GRB 110205A: Newcastle Observatory Optical Observations
  91. GRB 110205A: Swift-XRT refined Analysis
  92. GRB 110205A: optical flare confirmation
  93. GRB 110205A: Enhanced Swift-XRT position
  94. GRB 110205A: PAIRITEL NIR Afterglow Detection
  95. GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
  96. GRB 110205A: Liverpool Telescope Afterglow Confirmation
  97. GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
  98. GRB 110205A: TAROT Calern observatory optical detection
  99. GRB 110205A: Swift detection of a burst with an optical candidate
  100. GRB 110128A: Fermi GBM detection

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