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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. GRB080426: Swift/UVOT upper limits
  2. GRB 080426: Enhanced Swift-XRT position
  3. GRB 080426, Swift-BAT refined analysis
  4. GRB 080426: Swift detection of a possibly short burst
  5. Possible GRB 080315: XRT non-detection of afterglow
  6. GRB 080320 : Faulkes Telescope North Observations
  7. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  8. GRB080319A: MAGIC telescope GeV observation
  9. Swift-BAT trigger 309665 is not a GRB
  10. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  11. GRB 080420?: Swift detection of a possible short burst
  12. GRB080310, BVRcIc field calibration
  13. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  14. GRB 080413B: Rapid PROMPT Observations
  15. Swift XRT and UVOT observations of GRB080414
  16. GRB 080319B: Jet Break, Energetics, Supernova
  17. GRB 080413B: Faulkes Telescope South optical afterglow observations
  18. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  19. GRB 080413A: Suzaku WAM observation of the prompt emission
  20. GRB 080413B: Suzaku WAM observation of the prompt emission
  21. GRB 080413A: MOA-II optical afterglow observations
  22. GRB 080319B: Continued Gemini-N monitoring
  23. GRB 080414: RTT150 optical observations
  24. GRB 080414 Watcher observations
  25. GRB 080414: A long GRB detected by INTEGRAL
  26. VLA radio observations of GRB 080413B
  27. GRB 080413A: Gemini-South Spectroscopy
  28. GRB 080413B: Gemini-South Spectroscopy
  29. VLA radio observations of GRB 080413A
  30. IBAS Alert n. 5257 : not a GRB
  31. GRB 080413B: Ep,i-Eiso correlation
  32. GRB080413B
  33. Swift-BAT spectral lag analysis of GRB 080413B
  34. GRB 080413a, SMARTS optical/IR afterglow observations
  35. GRB 080413B: Swift XRT refined analysis
  36. GRB080413A: Swift/UVOT observations
  37. GRB 080413B, Swift-BAT refined analysis
  38. GRB 080413A: Swift-XRT refined analysis
  39. GRB 080413A, Swift-BAT refined analysis
  40. GRB 080413A Bootes observation
  41. GRB 080413A: VLT/UVES redshift
  42. GRB 080413B: VLT redshift
  43. GRB080413B: REM NIR & Optical Observation
  44. GRB 080413B: GROND detection of afterglow in all bands
  45. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  46. GRB 080413A: REM detection of the NIR Afterglow
  47. GRB 080413: Enhanced Swift-XRT position
  48. GRB 080413: TAROT Calern observatory optical observations
  49. GRB 080413: Swift detection of a burst with an optical afterglow
  50. GRB 080413: ROTSE-III Detection of Optical Counterpart
  51. GRB 080411: Swift/UVOT refined analysis
  52. GRB 080411, Swift-BAT refined analysis
  53. GRB 080411: Swift-XRT Refined Analysis
  54. Konus-Wind observation of GRB 080411
  55. GRB 080411: Enhanced Swift-XRT position
  56. GRB 080411: VLT redshift
  57. GRB 080411: GROND detection of optical afterglow candidate
  58. GRB080330: MAGIC telescope GeV observation
  59. GRB 080411: Swift detection of a bright burst
  60. GRB 080330: Swift-XRT refined position retraction
  61. GRB 080409: Swift-BAT refined analysis
  62. GRB 080408: GROND detection of optical/NIR afterglow candidate
  63. GRB 080330 optical observations
  64. Swift/UVOT observations of GRB080409
  65. GRB 080409: Swift XRT refined analysis
  66. UVOT/Swift Observations of GRB080408
  67. GRB 080408: Swift-XRT position of a possible afterglow
  68. GRB 080409: Enhanced Swift-XRT position
  69. GRB 080409: REM optical/NIR observations
  70. GRB 080409: Swift detection of a burst
  71. GRB 080408: Analysis of AGILE Gamma-ray data
  72. GRB 080408: GRB Localization by SuperAGILE
  73. GRB 080319A: Early RAPTOR optical limits
  74. GRB 080319B: HST observations
  75. GRB 080330: RAPTOR detection of prompt optical flash
  76. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  77. GRB 080405: Swift-BAT refined analysis
  78. GRB 080405: Swift-XRT position
  79. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  80. GRB 080325: optical upper limit
  81. GRB 080328: GAO 150cm telescope Optical Observation
  82. GRB080330: Improved Swift XRT Position
  83. GRB 080330: Prompt PROMPT Observations
  84. GRB080330: optical observations
  85. GRB 080319B: TORTORA light curve (Correction)
  86. GRB080328, RIMOTS optical upper limit
  87. GRB080330: optical observations
  88. GRB080330: Swift XRT refined analysis
  89. GRB 080330: REM optical observations
  90. GRB 080330, SMARTS optical/IR afterglow observations
  91. GRB 080330 Swift-UVOT refined analysis
  92. GRB 080328: Suzaku WAM observation of the prompt emission
  93. GRB080330: TNT optical observations
  94. GRB 080330, Swift-BAT refined analysis
  95. Konus-Wind observation of GRB 080328
  96. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  97. GRB080330: LOAO R-band Detection
  98. GRB 080330: GROND Observations
  99. GRB 080330: NOT redshift
  100. GRB 080330: TAROT Calern observatory optical observations

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