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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"

27888 results found.

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

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