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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"
  1. Konus-Wind observation of GRB 080411
  2. GRB 080411: Enhanced Swift-XRT position
  3. GRB 080411: VLT redshift
  4. GRB 080411: GROND detection of optical afterglow candidate
  5. GRB080330: MAGIC telescope GeV observation
  6. GRB 080411: Swift detection of a bright burst
  7. GRB 080330: Swift-XRT refined position retraction
  8. GRB 080409: Swift-BAT refined analysis
  9. GRB 080408: GROND detection of optical/NIR afterglow candidate
  10. GRB 080330 optical observations
  11. Swift/UVOT observations of GRB080409
  12. GRB 080409: Swift XRT refined analysis
  13. UVOT/Swift Observations of GRB080408
  14. GRB 080408: Swift-XRT position of a possible afterglow
  15. GRB 080409: Enhanced Swift-XRT position
  16. GRB 080409: REM optical/NIR observations
  17. GRB 080409: Swift detection of a burst
  18. GRB 080408: Analysis of AGILE Gamma-ray data
  19. GRB 080408: GRB Localization by SuperAGILE
  20. GRB 080319A: Early RAPTOR optical limits
  21. GRB 080319B: HST observations
  22. GRB 080330: RAPTOR detection of prompt optical flash
  23. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  24. GRB 080405: Swift-BAT refined analysis
  25. GRB 080405: Swift-XRT position
  26. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  27. GRB 080325: optical upper limit
  28. GRB 080328: GAO 150cm telescope Optical Observation
  29. GRB080330: Improved Swift XRT Position
  30. GRB 080330: Prompt PROMPT Observations
  31. GRB080330: optical observations
  32. GRB 080319B: TORTORA light curve (Correction)
  33. GRB080328, RIMOTS optical upper limit
  34. GRB080330: optical observations
  35. GRB080330: Swift XRT refined analysis
  36. GRB 080330: REM optical observations
  37. GRB 080330, SMARTS optical/IR afterglow observations
  38. GRB 080330 Swift-UVOT refined analysis
  39. GRB 080328: Suzaku WAM observation of the prompt emission
  40. GRB080330: TNT optical observations
  41. GRB 080330, Swift-BAT refined analysis
  42. Konus-Wind observation of GRB 080328
  43. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  44. GRB080330: LOAO R-band Detection
  45. GRB 080330: GROND Observations
  46. GRB 080330: NOT redshift
  47. GRB 080330: TAROT Calern observatory optical observations
  48. GRB 080330A: PAIRITEL Infrared Detections
  49. GRB 080330: error in reported XRT position
  50. GRB080330 - SDSS Pre-Burst Observations
  51. GRB 080330: Liverpool Telescope Optical observations
  52. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  53. GRB 080330: Swift detection of a burst with an optical counterpart
  54. GRB 080330: TAROT Calern observatory optical detection
  55. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  56. GRB 080328: BTA optical imaging and spectroscopy
  57. GRB 080328, Swift-BAT refined analysis
  58. GRB 080328: Swift XRT refined analysis
  59. GRB 080325, Swift-BAT refined analysis
  60. Swift/UVOT observations of GRB080328
  61. GRB080325 - I and z-band Imaging
  62. GRB080319B, BVRcIc field calibration
  63. GRB 080328: Enhanced Swift-XRT position
  64. GRB080328: Faulkes Telescope North observations
  65. GRB 080328: Swift detection of a burst with an optical counterpart
  66. GRB 080325: Subaru detection of NIR afterglow candidate
  67. GRB080310, late-time photometry with LBT
  68. GRB 080325: MITSuME Akeno optical upper limits
  69. GRB080325: XRT Refined Analysis
  70. GRB 080325: GROND Observations
  71. GRB080319B: optical observations
  72. GRB 080325: Swift/UVOT Upper Limits
  73. GRB 080319C: Gemini-North spectroscopic redshift
  74. GRB 080325: Early observations from OSN
  75. GRB 080325: NIR afterglow candidate
  76. GRB 080319D: GROND Detection of the Optical Counterpart
  77. GRB 080325: Enhanced Swift-XRT position
  78. GRB 080325: Swift detection of a burst
  79. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  80. IBAS Alert n. 5245: NOT a GRB
  81. GRB 080319B: Spitzer Mid-infrared Observations
  82. GRB 080319C: Suzaku WAM observation of the prompt emission
  83. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  84. Radio Detection of GRB 080319B
  85. GRB 080320, Swift-BAT refined analysis
  86. GRB 080319B: Optical observation (Brno, CZ)
  87. GRB 080319D: GROND Observations
  88. GRB 080319B: TORTORA light curve
  89. GRB 080319B: optical upper limit
  90. GRB 080319D: optical upper limit
  91. GRB080319B: Time-Independent XRT Spectrum
  92. GRB 080319D, Swift-BAT refined analysis
  93. GRB 080319C: UVOT Observations
  94. GRB 080319B: UVOT Observations
  95. GRB 080319A: UVOT Observations
  96. GRB 080320: Swift XRT refined analysis
  97. GRB 080319B - CARMA mm Observations
  98. GRB 080320: Early Super-LOTIS Observations
  99. GRB 080320: J detection with FLAMINGOS
  100. GRB 080319D: Swift XRT refined analysis

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