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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"

28056 results found.

  1. GRB 080325: Enhanced Swift-XRT position
  2. GRB 080325: Swift detection of a burst
  3. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  4. GRB 080319B: Spitzer Mid-infrared Observations
  5. GRB 080319C: Suzaku WAM observation of the prompt emission
  6. Radio Detection of GRB 080319B
  7. GRB 080320, Swift-BAT refined analysis
  8. GRB 080319D: GROND Observations
  9. GRB 080319B: optical upper limit
  10. GRB 080319D: optical upper limit
  11. GRB 080319D, Swift-BAT refined analysis
  12. GRB 080319C: UVOT Observations
  13. GRB 080319B: UVOT Observations
  14. GRB 080319A: UVOT Observations
  15. GRB 080320: Swift XRT refined analysis
  16. GRB 080320: J detection with FLAMINGOS
  17. GRB 080319D: Swift XRT refined analysis
  18. GRB 080320: optical limit
  19. GRB 080320: Gemini-N optical afterglow
  20. GRB 080319C, Swift-BAT refined analysis
  21. GRB 080320: Enhanced Swift-XRT position
  22. GRB 080320 - SDSS Pre-Burst Observations
  23. GRB 080320: Swift detection of a burst
  24. GRB 080319B : Lulin observation of temporal break at 0.2 days
  25. GRB 080319C - SDSS Pre-Burst Observations
  26. GRB 080319A SDSS Pre-Burst Observations
  27. GRB080319B - SDSS Pre-Burst Observations
  28. GRB 080319A: Swift-XRT Team Refined Analysis
  29. GRB 080319B, Swift-BAT refined analysis
  30. GRB 080319C: Swift-XRT Team Refined Analysis
  31. GRB 080319B: Swift-XRT Team Refined Analysis
  32. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  33. GRB 080319C: AGILE-MCAL observation of the prompt emission
  34. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  35. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  36. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  37. GRB 080319B: TORTORA synchronous observation
  38. GRB 080319B: Enhanced Swift-XRT position
  39. GRB 080319A: Enhanced Swift-XRT position
  40. GRB 080319A, Swift-BAT refined analysis
  41. GRB 080319B: REM early data
  42. GRB 080319C: Swift detection of a burst with an optical afterglow
  43. GRB 080319A: REM observations
  44. GRB 080319B: Change in power law decay index
  45. GRB 080319B: Gemini-South Spectroscopy
  46. GRB 080319A: optical observations at the NOT
  47. GRB 080319B: REM observations
  48. GRB080319A: P60 Optical Afterglow Observations
  49. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  50. GRB 080319A: Swift detection of a burst
  51. Swift Trigger 306745 is not a GRB
  52. Swift Trigger 306616 is not a GRB
  53. GRB080315: Bok Optical Observations
  54. Swift/UVOT observations of GRB 080315
  55. Swift trigger 306323: Swift-BAT/XRT refined analysis
  56. GRB 080315: Optical observations
  57. GRB 080315: TAROT Calern observatory optical observations
  58. GRB 080315: Swift detection of a possible burst
  59. GRB 080307: GAO 150cm telescope Optical Observation
  60. GRB 080229A: GAO 150cm telescope Optical Observation
  61. GRB 080310, Swift-BAT refined analysis
  62. GRB080210: optical observations
  63. GRB 080310: Swift-XRT refined analysis
  64. GRB 080310: Swift/UVOT Refined Analysis
  65. GRB 080310 - SDSS Pre-Burst Observations
  66. GRB 080310: Enhanced Swift-XRT position
  67. GRB 080310: RRM optical photometry with the VLT
  68. GRB080310, optical observations with LBT
  69. GRB 080310: REM observations
  70. GRB 080310: Swift detection of a burst with optical afterglow
  71. GRB080307, optical upper limit
  72. GRB080229, optical upper limit
  73. GRB 080307: Swift-XRT Team refined analysis
  74. GRB 080307: Swift/UVOT Upper Limits
  75. GRB 080307, Swift-BAT refined analysis
  76. GRB080307 - SDSS Pre-Burst Observations
  77. GRB 080307: TNT optical observation
  78. GRB080307: Optical upper limits
  79. GRB 080307: Gemini-N i-band observations - candidate afterglow
  80. GRB 080307: retraction of UVOT candidate
  81. GRB 080307: Enhanced Swift-XRT position
  82. GRB 080307, Preliminary Swift-BAT refined analysis
  83. GRB 080307: Optical observation with DMC/KANATA
  84. GRB 080307: Swift detection of a burst
  85. VLA possible radio detection of GRB 080229
  86. GRB 080303, Swift-BAT refined analysis
  87. GRB080303: Swift XRT refined analysis
  88. GRB 080303: Enhanced Swift-XRT position
  89. Swift UVOT observations of GRB080229B
  90. GRB080229B: Swift XRT afterglow observation
  91. GRB 080303: Swift detection of a burst with optical afterglow
  92. GRB 080303: REM NIR afterglow candidate
  93. GRB 080303A: ROTSE-III Optical Limits
  94. GRB 080229: I-band observations from OSN
  95. GRB 080229: VLT NIR observations
  96. GRB080229: Swift XRT refined analysis
  97. GRB 080229: TNG NIR observations
  98. GRB 080229: Enhanced Swift-XRT position
  99. GRB 080229: REM NIR observations
  100. GRB080229: Possible optical afterglow

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