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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"

28082 results found.

  1. GRB 080330: REM optical observations
  2. GRB 080330 Swift-UVOT refined analysis
  3. GRB 080328: Suzaku WAM observation of the prompt emission
  4. GRB080330: TNT optical observations
  5. GRB 080330, Swift-BAT refined analysis
  6. Konus-Wind observation of GRB 080328
  7. GRB 080330: GROND Observations
  8. GRB 080330: TAROT Calern observatory optical observations
  9. GRB 080330A: PAIRITEL Infrared Detections
  10. GRB 080330: error in reported XRT position
  11. GRB080330 - SDSS Pre-Burst Observations
  12. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  13. GRB 080330: Swift detection of a burst with an optical counterpart
  14. GRB 080330: TAROT Calern observatory optical detection
  15. GRB 080328, Swift-BAT refined analysis
  16. GRB 080325, Swift-BAT refined analysis
  17. Swift/UVOT observations of GRB080328
  18. GRB080319B, BVRcIc field calibration
  19. GRB 080328: Enhanced Swift-XRT position
  20. GRB 080328: Swift detection of a burst with an optical counterpart
  21. GRB 080325: Subaru detection of NIR afterglow candidate
  22. GRB 080325: GROND Observations
  23. GRB 080325: Swift/UVOT Upper Limits
  24. GRB 080325: Early observations from OSN
  25. GRB 080325: NIR afterglow candidate
  26. GRB 080319D: GROND Detection of the Optical Counterpart
  27. GRB 080325: Enhanced Swift-XRT position
  28. GRB 080325: Swift detection of a burst
  29. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  30. GRB 080319B: Spitzer Mid-infrared Observations
  31. GRB 080319C: Suzaku WAM observation of the prompt emission
  32. Radio Detection of GRB 080319B
  33. GRB 080320, Swift-BAT refined analysis
  34. GRB 080319D: GROND Observations
  35. GRB 080319B: optical upper limit
  36. GRB 080319D: optical upper limit
  37. GRB 080319D, Swift-BAT refined analysis
  38. GRB 080319C: UVOT Observations
  39. GRB 080319B: UVOT Observations
  40. GRB 080319A: UVOT Observations
  41. GRB 080320: Swift XRT refined analysis
  42. GRB 080320: J detection with FLAMINGOS
  43. GRB 080319D: Swift XRT refined analysis
  44. GRB 080320: optical limit
  45. GRB 080320: Gemini-N optical afterglow
  46. GRB 080319C, Swift-BAT refined analysis
  47. GRB 080320: Enhanced Swift-XRT position
  48. GRB 080320 - SDSS Pre-Burst Observations
  49. GRB 080320: Swift detection of a burst
  50. GRB 080319B : Lulin observation of temporal break at 0.2 days
  51. GRB 080319C - SDSS Pre-Burst Observations
  52. GRB 080319A SDSS Pre-Burst Observations
  53. GRB080319B - SDSS Pre-Burst Observations
  54. GRB 080319A: Swift-XRT Team Refined Analysis
  55. GRB 080319B, Swift-BAT refined analysis
  56. GRB 080319C: Swift-XRT Team Refined Analysis
  57. GRB 080319B: Swift-XRT Team Refined Analysis
  58. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  59. GRB 080319C: AGILE-MCAL observation of the prompt emission
  60. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  61. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  62. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  63. GRB 080319B: TORTORA synchronous observation
  64. GRB 080319B: Enhanced Swift-XRT position
  65. GRB 080319A: Enhanced Swift-XRT position
  66. GRB 080319A, Swift-BAT refined analysis
  67. GRB 080319B: REM early data
  68. GRB 080319C: Swift detection of a burst with an optical afterglow
  69. GRB 080319A: REM observations
  70. GRB 080319B: Change in power law decay index
  71. GRB 080319B: Gemini-South Spectroscopy
  72. GRB 080319A: optical observations at the NOT
  73. GRB 080319B: REM observations
  74. GRB080319A: P60 Optical Afterglow Observations
  75. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  76. GRB 080319A: Swift detection of a burst
  77. Swift Trigger 306745 is not a GRB
  78. Swift Trigger 306616 is not a GRB
  79. GRB080315: Bok Optical Observations
  80. Swift/UVOT observations of GRB 080315
  81. Swift trigger 306323: Swift-BAT/XRT refined analysis
  82. GRB 080315: Optical observations
  83. GRB 080315: TAROT Calern observatory optical observations
  84. GRB 080315: Swift detection of a possible burst
  85. GRB 080307: GAO 150cm telescope Optical Observation
  86. GRB 080229A: GAO 150cm telescope Optical Observation
  87. GRB 080310, Swift-BAT refined analysis
  88. GRB080210: optical observations
  89. GRB 080310: Swift-XRT refined analysis
  90. GRB 080310: Swift/UVOT Refined Analysis
  91. GRB 080310 - SDSS Pre-Burst Observations
  92. GRB 080310: Enhanced Swift-XRT position
  93. GRB 080310: RRM optical photometry with the VLT
  94. GRB080310, optical observations with LBT
  95. GRB 080310: REM observations
  96. GRB 080310: Swift detection of a burst with optical afterglow
  97. GRB080307, optical upper limit
  98. GRB080229, optical upper limit
  99. GRB 080307: Swift-XRT Team refined analysis
  100. GRB 080307: Swift/UVOT Upper Limits

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