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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"

28042 results found.

  1. GRB 080320: Swift XRT refined analysis
  2. GRB 080320: J detection with FLAMINGOS
  3. GRB 080319D: Swift XRT refined analysis
  4. GRB 080320: optical limit
  5. GRB 080320: Gemini-N optical afterglow
  6. GRB 080319C, Swift-BAT refined analysis
  7. GRB 080320: Enhanced Swift-XRT position
  8. GRB 080320 - SDSS Pre-Burst Observations
  9. GRB 080320: Swift detection of a burst
  10. GRB 080319B : Lulin observation of temporal break at 0.2 days
  11. GRB 080319C - SDSS Pre-Burst Observations
  12. GRB 080319A SDSS Pre-Burst Observations
  13. GRB080319B - SDSS Pre-Burst Observations
  14. GRB 080319A: Swift-XRT Team Refined Analysis
  15. GRB 080319B, Swift-BAT refined analysis
  16. GRB 080319C: Swift-XRT Team Refined Analysis
  17. GRB 080319B: Swift-XRT Team Refined Analysis
  18. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  19. GRB 080319C: AGILE-MCAL observation of the prompt emission
  20. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  21. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  22. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  23. GRB 080319B: TORTORA synchronous observation
  24. GRB 080319B: Enhanced Swift-XRT position
  25. GRB 080319A: Enhanced Swift-XRT position
  26. GRB 080319A, Swift-BAT refined analysis
  27. GRB 080319B: REM early data
  28. GRB 080319C: Swift detection of a burst with an optical afterglow
  29. GRB 080319A: REM observations
  30. GRB 080319B: Change in power law decay index
  31. GRB 080319B: Gemini-South Spectroscopy
  32. GRB 080319A: optical observations at the NOT
  33. GRB 080319B: REM observations
  34. GRB080319A: P60 Optical Afterglow Observations
  35. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  36. GRB 080319A: Swift detection of a burst
  37. Swift Trigger 306745 is not a GRB
  38. Swift Trigger 306616 is not a GRB
  39. GRB080315: Bok Optical Observations
  40. Swift/UVOT observations of GRB 080315
  41. Swift trigger 306323: Swift-BAT/XRT refined analysis
  42. GRB 080315: Optical observations
  43. GRB 080315: TAROT Calern observatory optical observations
  44. GRB 080315: Swift detection of a possible burst
  45. GRB 080307: GAO 150cm telescope Optical Observation
  46. GRB 080229A: GAO 150cm telescope Optical Observation
  47. GRB 080310, Swift-BAT refined analysis
  48. GRB080210: optical observations
  49. GRB 080310: Swift-XRT refined analysis
  50. GRB 080310: Swift/UVOT Refined Analysis
  51. GRB 080310 - SDSS Pre-Burst Observations
  52. GRB 080310: Enhanced Swift-XRT position
  53. GRB 080310: RRM optical photometry with the VLT
  54. GRB080310, optical observations with LBT
  55. GRB 080310: REM observations
  56. GRB 080310: Swift detection of a burst with optical afterglow
  57. GRB080307, optical upper limit
  58. GRB080229, optical upper limit
  59. GRB 080307: Swift-XRT Team refined analysis
  60. GRB 080307: Swift/UVOT Upper Limits
  61. GRB 080307, Swift-BAT refined analysis
  62. GRB080307 - SDSS Pre-Burst Observations
  63. GRB 080307: TNT optical observation
  64. GRB080307: Optical upper limits
  65. GRB 080307: Gemini-N i-band observations - candidate afterglow
  66. GRB 080307: retraction of UVOT candidate
  67. GRB 080307: Enhanced Swift-XRT position
  68. GRB 080307, Preliminary Swift-BAT refined analysis
  69. GRB 080307: Optical observation with DMC/KANATA
  70. GRB 080307: Swift detection of a burst
  71. VLA possible radio detection of GRB 080229
  72. GRB 080303, Swift-BAT refined analysis
  73. GRB080303: Swift XRT refined analysis
  74. GRB 080303: Enhanced Swift-XRT position
  75. Swift UVOT observations of GRB080229B
  76. GRB080229B: Swift XRT afterglow observation
  77. GRB 080303: Swift detection of a burst with optical afterglow
  78. GRB 080303: REM NIR afterglow candidate
  79. GRB 080303A: ROTSE-III Optical Limits
  80. GRB 080229: I-band observations from OSN
  81. GRB 080229: VLT NIR observations
  82. GRB080229: Swift XRT refined analysis
  83. GRB 080229: TNG NIR observations
  84. GRB 080229: Enhanced Swift-XRT position
  85. GRB 080229: REM NIR observations
  86. GRB080229: Possible optical afterglow
  87. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  88. UVOT analysis for GRB080229
  89. GRB 080229, Swift-BAT refined analysis
  90. GRB 080229A: ROTSE-III Optical Limits
  91. GRB 080229: Swift detection of a bright burst
  92. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  93. Swift-XRT improved positions, and new redshift limits.
  94. ESO optical and NIR observations of GRB 080218B
  95. GRB 080204: Suzaku WAM observation of the prompt emission
  96. GRB 080218B, Swift-BAT refined analysis
  97. GRB 080218B: Swift-XRT refined analysis
  98. Swift/UVOT observations of GRB080218B
  99. GRB 080218B: REM NIR early upper limits
  100. GRB 080218B: Enhanced Swift-XRT position

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