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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 080506: Observations from NOT
  2. GRB 080506: optical observation from Ondrejov
  3. GRB 080506: TLS afterglow detection in VRIZ
  4. GRB 080506: Enhanced Swift-XRT position
  5. GRB 080506: Optical observation with KANATA/TRISPEC
  6. GRB 080506: Swift detection of a burst with optical afterglow
  7. GRB 080503: VLA radio upper limit
  8. GRB 080503: Observations from NOT
  9. GRB 080503: Slow-rise optical AG ?
  10. GRB 080430: TLS imaging one day after the GRB
  11. GRB 080503: No further optical rebrightening
  12. GRB 080503: Late-time Optical rebrightening (possible mini-SN) - correction
  13. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  14. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  15. GRB 080503: MITSuME Ishigakijima optical upper limits
  16. GRB080503: Swift/UVOT Upper Limits
  17. GRB080503 XRT refined analysis
  18. GRB 080503, Swift-BAT refined analysis
  19. GRB 080430
  20. GRB 080430
  21. GRB 080430
  22. GRB 080503: Enhanced Swift-XRT position
  23. GRB 080503: MITSuME Akeno optical upper limits
  24. GRB 080503: New candidate afterglow/host in Gemini imaging
  25. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  26. GRB 080503: Swift detection of a short burst
  27. GRB 080411: Continued Swift Monitoring
  28. GRB 080430: Optical observations
  29. GRB 080430: Shallow decay
  30. GRB080430: RTT150 Optical Observations
  31. GRB080430: Swift/UVOT observations
  32. VLA radio upper limit on GRB 080430
  33. GRB 080430 - multicolor observations of the afterglow
  34. GRB 080430 optical observations
  35. GRB 080430, Swift-BAT refined analysis
  36. GRB080430: optical observations
  37. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  38. GRB 080430: Swift-XRT refined analysis
  39. GRB 080430: Enhanced Swift-XRT position
  40. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  41. GRB 080430: Spectroscopy from CAHA
  42. GRB 080430 - SDSS Pre-Burst Observations
  43. GRB 080430: Bootes observation
  44. GRB 080430: Swift detection of a burst with optical afterglow
  45. GRB 080430: TAROT Calern observatory optical observations
  46. GRB960202B - on the association with SN 1996cr
  47. GRB080426: Observations from CAHA
  48. GRB 080426: Swift-XRT refined analysis
  49. GRB080426: Swift/UVOT upper limits
  50. GRB 080426: Enhanced Swift-XRT position
  51. GRB 080426, Swift-BAT refined analysis
  52. GRB 080426: Swift detection of a possibly short burst
  53. Possible GRB 080315: XRT non-detection of afterglow
  54. GRB 080320 : Faulkes Telescope North Observations
  55. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  56. GRB080319A: MAGIC telescope GeV observation
  57. Swift-BAT trigger 309665 is not a GRB
  58. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  59. GRB 080420?: Swift detection of a possible short burst
  60. GRB080310, BVRcIc field calibration
  61. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  62. GRB 080413B: Rapid PROMPT Observations
  63. Swift XRT and UVOT observations of GRB080414
  64. GRB 080319B: Jet Break, Energetics, Supernova
  65. GRB 080413B: Faulkes Telescope South optical afterglow observations
  66. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  67. GRB 080413A: Suzaku WAM observation of the prompt emission
  68. GRB 080413B: Suzaku WAM observation of the prompt emission
  69. GRB 080413A: MOA-II optical afterglow observations
  70. GRB 080319B: Continued Gemini-N monitoring
  71. GRB 080414: RTT150 optical observations
  72. GRB 080414 Watcher observations
  73. GRB 080414: A long GRB detected by INTEGRAL
  74. VLA radio observations of GRB 080413B
  75. GRB 080413A: Gemini-South Spectroscopy
  76. GRB 080413B: Gemini-South Spectroscopy
  77. VLA radio observations of GRB 080413A
  78. IBAS Alert n. 5257 : not a GRB
  79. GRB 080413B: Ep,i-Eiso correlation
  80. GRB080413B
  81. Swift-BAT spectral lag analysis of GRB 080413B
  82. GRB 080413a, SMARTS optical/IR afterglow observations
  83. GRB 080413B: Swift XRT refined analysis
  84. GRB080413A: Swift/UVOT observations
  85. GRB 080413B, Swift-BAT refined analysis
  86. GRB 080413A: Swift-XRT refined analysis
  87. GRB 080413A, Swift-BAT refined analysis
  88. GRB 080413A Bootes observation
  89. GRB 080413A: VLT/UVES redshift
  90. GRB 080413B: VLT redshift
  91. GRB080413B: REM NIR & Optical Observation
  92. GRB 080413B: GROND detection of afterglow in all bands
  93. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  94. GRB 080413A: REM detection of the NIR Afterglow
  95. GRB 080413: Enhanced Swift-XRT position
  96. GRB 080413: TAROT Calern observatory optical observations
  97. GRB 080413: Swift detection of a burst with an optical afterglow
  98. GRB 080413: ROTSE-III Detection of Optical Counterpart
  99. GRB 080411: Swift/UVOT refined analysis
  100. GRB 080411, Swift-BAT refined analysis

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