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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"

28047 results found.

  1. GRB 080319D: optical upper limit
  2. GRB 080319D, Swift-BAT refined analysis
  3. GRB 080319C: UVOT Observations
  4. GRB 080319B: UVOT Observations
  5. GRB 080319A: UVOT Observations
  6. GRB 080320: Swift XRT refined analysis
  7. GRB 080320: J detection with FLAMINGOS
  8. GRB 080319D: Swift XRT refined analysis
  9. GRB 080320: optical limit
  10. GRB 080320: Gemini-N optical afterglow
  11. GRB 080319C, Swift-BAT refined analysis
  12. GRB 080320: Enhanced Swift-XRT position
  13. GRB 080320 - SDSS Pre-Burst Observations
  14. GRB 080320: Swift detection of a burst
  15. GRB 080319B : Lulin observation of temporal break at 0.2 days
  16. GRB 080319C - SDSS Pre-Burst Observations
  17. GRB 080319A SDSS Pre-Burst Observations
  18. GRB080319B - SDSS Pre-Burst Observations
  19. GRB 080319A: Swift-XRT Team Refined Analysis
  20. GRB 080319B, Swift-BAT refined analysis
  21. GRB 080319C: Swift-XRT Team Refined Analysis
  22. GRB 080319B: Swift-XRT Team Refined Analysis
  23. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  24. GRB 080319C: AGILE-MCAL observation of the prompt emission
  25. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  26. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  27. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  28. GRB 080319B: TORTORA synchronous observation
  29. GRB 080319B: Enhanced Swift-XRT position
  30. GRB 080319A: Enhanced Swift-XRT position
  31. GRB 080319A, Swift-BAT refined analysis
  32. GRB 080319B: REM early data
  33. GRB 080319C: Swift detection of a burst with an optical afterglow
  34. GRB 080319A: REM observations
  35. GRB 080319B: Change in power law decay index
  36. GRB 080319B: Gemini-South Spectroscopy
  37. GRB 080319A: optical observations at the NOT
  38. GRB 080319B: REM observations
  39. GRB080319A: P60 Optical Afterglow Observations
  40. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  41. GRB 080319A: Swift detection of a burst
  42. Swift Trigger 306745 is not a GRB
  43. Swift Trigger 306616 is not a GRB
  44. GRB080315: Bok Optical Observations
  45. Swift/UVOT observations of GRB 080315
  46. Swift trigger 306323: Swift-BAT/XRT refined analysis
  47. GRB 080315: Optical observations
  48. GRB 080315: TAROT Calern observatory optical observations
  49. GRB 080315: Swift detection of a possible burst
  50. GRB 080307: GAO 150cm telescope Optical Observation
  51. GRB 080229A: GAO 150cm telescope Optical Observation
  52. GRB 080310, Swift-BAT refined analysis
  53. GRB080210: optical observations
  54. GRB 080310: Swift-XRT refined analysis
  55. GRB 080310: Swift/UVOT Refined Analysis
  56. GRB 080310 - SDSS Pre-Burst Observations
  57. GRB 080310: Enhanced Swift-XRT position
  58. GRB 080310: RRM optical photometry with the VLT
  59. GRB080310, optical observations with LBT
  60. GRB 080310: REM observations
  61. GRB 080310: Swift detection of a burst with optical afterglow
  62. GRB080307, optical upper limit
  63. GRB080229, optical upper limit
  64. GRB 080307: Swift-XRT Team refined analysis
  65. GRB 080307: Swift/UVOT Upper Limits
  66. GRB 080307, Swift-BAT refined analysis
  67. GRB080307 - SDSS Pre-Burst Observations
  68. GRB 080307: TNT optical observation
  69. GRB080307: Optical upper limits
  70. GRB 080307: Gemini-N i-band observations - candidate afterglow
  71. GRB 080307: retraction of UVOT candidate
  72. GRB 080307: Enhanced Swift-XRT position
  73. GRB 080307, Preliminary Swift-BAT refined analysis
  74. GRB 080307: Optical observation with DMC/KANATA
  75. GRB 080307: Swift detection of a burst
  76. VLA possible radio detection of GRB 080229
  77. GRB 080303, Swift-BAT refined analysis
  78. GRB080303: Swift XRT refined analysis
  79. GRB 080303: Enhanced Swift-XRT position
  80. Swift UVOT observations of GRB080229B
  81. GRB080229B: Swift XRT afterglow observation
  82. GRB 080303: Swift detection of a burst with optical afterglow
  83. GRB 080303: REM NIR afterglow candidate
  84. GRB 080303A: ROTSE-III Optical Limits
  85. GRB 080229: I-band observations from OSN
  86. GRB 080229: VLT NIR observations
  87. GRB080229: Swift XRT refined analysis
  88. GRB 080229: TNG NIR observations
  89. GRB 080229: Enhanced Swift-XRT position
  90. GRB 080229: REM NIR observations
  91. GRB080229: Possible optical afterglow
  92. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  93. UVOT analysis for GRB080229
  94. GRB 080229, Swift-BAT refined analysis
  95. GRB 080229A: ROTSE-III Optical Limits
  96. GRB 080229: Swift detection of a bright burst
  97. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  98. Swift-XRT improved positions, and new redshift limits.
  99. ESO optical and NIR observations of GRB 080218B
  100. GRB 080204: Suzaku WAM observation of the prompt emission

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