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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 080513
  2. IPN triangulation of bright GRB 080513
  3. Swift-BAT refined analysis for Trigger 311603: Galactic source
  4. GRB 080515, Swift-BAT refined analysis
  5. GRB 080514B: KPNO 4m IR observations
  6. GRB 080514B: slow fading behaviour ?
  7. GRB 080514B: Swift-XRT analysis
  8. GRB 080514B, GROND observations
  9. GRB 080515: Swift detection of a burst
  10. GRB 080514B: Finding chart
  11. GRB 080514B: Afterglow candidate
  12. GRB 080514B: Watcher observations
  13. GRB 080430
  14. GRB 080514B: possible AGILE detection at E>50 MeV
  15. GRB 080514B: SuperAGILE/IPN GRB Localization
  16. procesure for GRB Circular
  17. Swift detection of a possible galactic transient
  18. GRB080514: REM NIR & Optical Observations
  19. Konus-Wind observation of GRB 080507
  20. GRB 080319B: Further HST observations and underlying host
  21. GRB 080506: NAYUTA Optical Observation
  22. GRB 080507: Suzaku WAM observation of the prompt emission
  23. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  24. GRB 080507: Keck photometry
  25. GRB 080507: E Pur Si Muove!
  26. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  27. GRB 080503: Hubble Space Telescope Imaging
  28. GRB080507: Swift/UVOT followup observations
  29. GRB 080507: Optical Afterglow
  30. GRB 080506:Optical observations from HCT
  31. GRB 080507: Swift-XRT position of a possible afterglow
  32. GRB 080506: VLA radio upper limit
  33. GRB 080507: GRB localization by SuperAGILE
  34. GRB 080506: TLS 2nd Epoch - possible light curve break
  35. GRB 080503: Fading in continued Gemini imaging
  36. GRB 080506: Swift XRT refined analysis
  37. GRB080506: Swift/UVOT observations
  38. GRB 080506, Swift-BAT refined analysis
  39. GRB080503, RIMOTS optical upper limit
  40. GRB 080506: Observations from NOT
  41. GRB 080506: optical observation from Ondrejov
  42. GRB 080506: TLS afterglow detection in VRIZ
  43. GRB 080506: Enhanced Swift-XRT position
  44. GRB 080506: Optical observation with KANATA/TRISPEC
  45. GRB 080506: Swift detection of a burst with optical afterglow
  46. GRB 080503: VLA radio upper limit
  47. GRB 080503: Observations from NOT
  48. GRB 080503: Slow-rise optical AG ?
  49. GRB 080430: TLS imaging one day after the GRB
  50. GRB 080503: No further optical rebrightening
  51. GRB 080503: Late-time Optical rebrightening (possible mini-SN) - correction
  52. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  53. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  54. GRB 080503: MITSuME Ishigakijima optical upper limits
  55. GRB080503: Swift/UVOT Upper Limits
  56. GRB080503 XRT refined analysis
  57. GRB 080503, Swift-BAT refined analysis
  58. GRB 080430
  59. GRB 080430
  60. GRB 080430
  61. GRB 080503: Enhanced Swift-XRT position
  62. GRB 080503: MITSuME Akeno optical upper limits
  63. GRB 080503: New candidate afterglow/host in Gemini imaging
  64. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  65. GRB 080503: Swift detection of a short burst
  66. GRB 080411: Continued Swift Monitoring
  67. GRB 080430: Optical observations
  68. GRB 080430: Shallow decay
  69. GRB080430: RTT150 Optical Observations
  70. GRB080430: Swift/UVOT observations
  71. VLA radio upper limit on GRB 080430
  72. GRB 080430 - multicolor observations of the afterglow
  73. GRB 080430 optical observations
  74. GRB 080430, Swift-BAT refined analysis
  75. GRB080430: optical observations
  76. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  77. GRB 080430: Swift-XRT refined analysis
  78. GRB 080430: Enhanced Swift-XRT position
  79. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  80. GRB 080430: Spectroscopy from CAHA
  81. GRB 080430 - SDSS Pre-Burst Observations
  82. GRB 080430: Bootes observation
  83. GRB 080430: Swift detection of a burst with optical afterglow
  84. GRB 080430: TAROT Calern observatory optical observations
  85. GRB960202B - on the association with SN 1996cr
  86. GRB080426: Observations from CAHA
  87. GRB 080426: Swift-XRT refined analysis
  88. GRB080426: Swift/UVOT upper limits
  89. GRB 080426: Enhanced Swift-XRT position
  90. GRB 080426, Swift-BAT refined analysis
  91. GRB 080426: Swift detection of a possibly short burst
  92. Possible GRB 080315: XRT non-detection of afterglow
  93. GRB 080320 : Faulkes Telescope North Observations
  94. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  95. GRB080319A: MAGIC telescope GeV observation
  96. Swift-BAT trigger 309665 is not a GRB
  97. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  98. GRB 080420?: Swift detection of a possible short burst
  99. GRB080310, BVRcIc field calibration
  100. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis

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