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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 080514B, GROND observations
  2. GRB 080515: Swift detection of a burst
  3. GRB 080514B: Finding chart
  4. GRB 080514B: Afterglow candidate
  5. GRB 080514B: Watcher observations
  6. GRB 080430
  7. GRB 080514B: possible AGILE detection at E>50 MeV
  8. GRB 080514B: SuperAGILE/IPN GRB Localization
  9. procesure for GRB Circular
  10. Swift detection of a possible galactic transient
  11. GRB080514: REM NIR & Optical Observations
  12. Konus-Wind observation of GRB 080507
  13. GRB 080319B: Further HST observations and underlying host
  14. GRB 080506: NAYUTA Optical Observation
  15. GRB 080507: Suzaku WAM observation of the prompt emission
  16. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  17. GRB 080507: Keck photometry
  18. GRB 080507: E Pur Si Muove!
  19. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  20. GRB 080503: Hubble Space Telescope Imaging
  21. GRB080507: Swift/UVOT followup observations
  22. GRB 080507: Optical Afterglow
  23. GRB 080506:Optical observations from HCT
  24. GRB 080507: Swift-XRT position of a possible afterglow
  25. GRB 080506: VLA radio upper limit
  26. GRB 080507: GRB localization by SuperAGILE
  27. GRB 080506: TLS 2nd Epoch - possible light curve break
  28. GRB 080503: Fading in continued Gemini imaging
  29. GRB 080506: Swift XRT refined analysis
  30. GRB080506: Swift/UVOT observations
  31. GRB 080506, Swift-BAT refined analysis
  32. GRB080503, RIMOTS optical upper limit
  33. GRB 080506: Observations from NOT
  34. GRB 080506: optical observation from Ondrejov
  35. GRB 080506: TLS afterglow detection in VRIZ
  36. GRB 080506: Enhanced Swift-XRT position
  37. GRB 080506: Optical observation with KANATA/TRISPEC
  38. GRB 080506: Swift detection of a burst with optical afterglow
  39. GRB 080503: VLA radio upper limit
  40. GRB 080503: Observations from NOT
  41. GRB 080503: Slow-rise optical AG ?
  42. GRB 080430: TLS imaging one day after the GRB
  43. GRB 080503: No further optical rebrightening
  44. GRB 080503: Late-time Optical rebrightening (possible mini-SN) - correction
  45. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  46. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  47. GRB 080503: MITSuME Ishigakijima optical upper limits
  48. GRB080503: Swift/UVOT Upper Limits
  49. GRB080503 XRT refined analysis
  50. GRB 080503, Swift-BAT refined analysis
  51. GRB 080430
  52. GRB 080430
  53. GRB 080430
  54. GRB 080503: Enhanced Swift-XRT position
  55. GRB 080503: MITSuME Akeno optical upper limits
  56. GRB 080503: New candidate afterglow/host in Gemini imaging
  57. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  58. GRB 080503: Swift detection of a short burst
  59. GRB 080411: Continued Swift Monitoring
  60. GRB 080430: Optical observations
  61. GRB 080430: Shallow decay
  62. GRB080430: RTT150 Optical Observations
  63. GRB080430: Swift/UVOT observations
  64. VLA radio upper limit on GRB 080430
  65. GRB 080430 - multicolor observations of the afterglow
  66. GRB 080430 optical observations
  67. GRB 080430, Swift-BAT refined analysis
  68. GRB080430: optical observations
  69. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  70. GRB 080430: Swift-XRT refined analysis
  71. GRB 080430: Enhanced Swift-XRT position
  72. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  73. GRB 080430: Spectroscopy from CAHA
  74. GRB 080430 - SDSS Pre-Burst Observations
  75. GRB 080430: Bootes observation
  76. GRB 080430: Swift detection of a burst with optical afterglow
  77. GRB 080430: TAROT Calern observatory optical observations
  78. GRB960202B - on the association with SN 1996cr
  79. GRB080426: Observations from CAHA
  80. GRB 080426: Swift-XRT refined analysis
  81. GRB080426: Swift/UVOT upper limits
  82. GRB 080426: Enhanced Swift-XRT position
  83. GRB 080426, Swift-BAT refined analysis
  84. GRB 080426: Swift detection of a possibly short burst
  85. Possible GRB 080315: XRT non-detection of afterglow
  86. GRB 080320 : Faulkes Telescope North Observations
  87. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  88. GRB080319A: MAGIC telescope GeV observation
  89. Swift-BAT trigger 309665 is not a GRB
  90. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  91. GRB 080420?: Swift detection of a possible short burst
  92. GRB080310, BVRcIc field calibration
  93. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  94. GRB 080413B: Rapid PROMPT Observations
  95. Swift XRT and UVOT observations of GRB080414
  96. GRB 080319B: Jet Break, Energetics, Supernova
  97. GRB 080413B: Faulkes Telescope South optical afterglow observations
  98. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  99. GRB 080413A: Suzaku WAM observation of the prompt emission
  100. GRB 080413B: Suzaku WAM observation of the prompt emission

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