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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. GRB 080413B: Rapid PROMPT Observations
  2. Swift XRT and UVOT observations of GRB080414
  3. GRB 080319B: Jet Break, Energetics, Supernova
  4. GRB 080413B: Faulkes Telescope South optical afterglow observations
  5. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  6. GRB 080413A: Suzaku WAM observation of the prompt emission
  7. GRB 080413B: Suzaku WAM observation of the prompt emission
  8. GRB 080413A: MOA-II optical afterglow observations
  9. GRB 080319B: Continued Gemini-N monitoring
  10. GRB 080414: RTT150 optical observations
  11. GRB 080414 Watcher observations
  12. GRB 080414: A long GRB detected by INTEGRAL
  13. VLA radio observations of GRB 080413B
  14. GRB 080413A: Gemini-South Spectroscopy
  15. GRB 080413B: Gemini-South Spectroscopy
  16. VLA radio observations of GRB 080413A
  17. IBAS Alert n. 5257 : not a GRB
  18. GRB 080413B: Ep,i-Eiso correlation
  19. GRB080413B
  20. Swift-BAT spectral lag analysis of GRB 080413B
  21. GRB 080413a, SMARTS optical/IR afterglow observations
  22. GRB 080413B: Swift XRT refined analysis
  23. GRB080413A: Swift/UVOT observations
  24. GRB 080413B, Swift-BAT refined analysis
  25. GRB 080413A: Swift-XRT refined analysis
  26. GRB 080413A, Swift-BAT refined analysis
  27. GRB 080413A Bootes observation
  28. GRB 080413A: VLT/UVES redshift
  29. GRB 080413B: VLT redshift
  30. GRB080413B: REM NIR & Optical Observation
  31. GRB 080413B: GROND detection of afterglow in all bands
  32. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  33. GRB 080413A: REM detection of the NIR Afterglow
  34. GRB 080413: Enhanced Swift-XRT position
  35. GRB 080413: TAROT Calern observatory optical observations
  36. GRB 080413: Swift detection of a burst with an optical afterglow
  37. GRB 080413: ROTSE-III Detection of Optical Counterpart
  38. GRB 080411: Swift/UVOT refined analysis
  39. GRB 080411, Swift-BAT refined analysis
  40. GRB 080411: Swift-XRT Refined Analysis
  41. Konus-Wind observation of GRB 080411
  42. GRB 080411: Enhanced Swift-XRT position
  43. GRB 080411: VLT redshift
  44. GRB 080411: GROND detection of optical afterglow candidate
  45. GRB080330: MAGIC telescope GeV observation
  46. GRB 080411: Swift detection of a bright burst
  47. GRB 080330: Swift-XRT refined position retraction
  48. GRB 080409: Swift-BAT refined analysis
  49. GRB 080408: GROND detection of optical/NIR afterglow candidate
  50. GRB 080330 optical observations
  51. Swift/UVOT observations of GRB080409
  52. GRB 080409: Swift XRT refined analysis
  53. UVOT/Swift Observations of GRB080408
  54. GRB 080408: Swift-XRT position of a possible afterglow
  55. GRB 080409: Enhanced Swift-XRT position
  56. GRB 080409: REM optical/NIR observations
  57. GRB 080409: Swift detection of a burst
  58. GRB 080408: Analysis of AGILE Gamma-ray data
  59. GRB 080408: GRB Localization by SuperAGILE
  60. GRB 080319A: Early RAPTOR optical limits
  61. GRB 080319B: HST observations
  62. GRB 080330: RAPTOR detection of prompt optical flash
  63. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  64. GRB 080405: Swift-BAT refined analysis
  65. GRB 080405: Swift-XRT position
  66. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  67. GRB 080325: optical upper limit
  68. GRB 080328: GAO 150cm telescope Optical Observation
  69. GRB080330: Improved Swift XRT Position
  70. GRB 080330: Prompt PROMPT Observations
  71. GRB080330: optical observations
  72. GRB 080319B: TORTORA light curve (Correction)
  73. GRB080328, RIMOTS optical upper limit
  74. GRB080330: optical observations
  75. GRB080330: Swift XRT refined analysis
  76. GRB 080330: REM optical observations
  77. GRB 080330, SMARTS optical/IR afterglow observations
  78. GRB 080330 Swift-UVOT refined analysis
  79. GRB 080328: Suzaku WAM observation of the prompt emission
  80. GRB080330: TNT optical observations
  81. GRB 080330, Swift-BAT refined analysis
  82. Konus-Wind observation of GRB 080328
  83. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  84. GRB080330: LOAO R-band Detection
  85. GRB 080330: GROND Observations
  86. GRB 080330: NOT redshift
  87. GRB 080330: TAROT Calern observatory optical observations
  88. GRB 080330A: PAIRITEL Infrared Detections
  89. GRB 080330: error in reported XRT position
  90. GRB080330 - SDSS Pre-Burst Observations
  91. GRB 080330: Liverpool Telescope Optical observations
  92. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  93. GRB 080330: Swift detection of a burst with an optical counterpart
  94. GRB 080330: TAROT Calern observatory optical detection
  95. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  96. GRB 080328: BTA optical imaging and spectroscopy
  97. GRB 080328, Swift-BAT refined analysis
  98. GRB 080328: Swift XRT refined analysis
  99. GRB 080325, Swift-BAT refined analysis
  100. Swift/UVOT observations of GRB080328

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