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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"

32538 results found.

  1. GRB080503 XRT refined analysis
  2. GRB 080503, Swift-BAT refined analysis
  3. GRB 080430
  4. GRB 080430
  5. GRB 080503: MITSuME Akeno optical upper limits
  6. GRB 080503: New candidate afterglow/host in Gemini imaging
  7. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  8. GRB 080411: Continued Swift Monitoring
  9. GRB 080430: Optical observations
  10. GRB 080430: Shallow decay
  11. GRB080430: RTT150 Optical Observations
  12. GRB080430: Swift/UVOT observations
  13. VLA radio upper limit on GRB 080430
  14. GRB 080430 - multicolor observations of the afterglow
  15. GRB 080430 optical observations
  16. GRB 080430, Swift-BAT refined analysis
  17. GRB080430: optical observations
  18. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  19. GRB 080430: Swift-XRT refined analysis
  20. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  21. GRB080426: Observations from CAHA
  22. GRB 080426: Swift-XRT refined analysis
  23. GRB080426: Swift/UVOT upper limits
  24. GRB 080426, Swift-BAT refined analysis
  25. Possible GRB 080315: XRT non-detection of afterglow
  26. GRB 080320 : Faulkes Telescope North Observations
  27. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  28. GRB080319A: MAGIC telescope GeV observation
  29. Swift-BAT trigger 309665 is not a GRB
  30. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  31. GRB 080420?: Swift detection of a possible short burst
  32. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  33. GRB 080413B: Rapid PROMPT Observations
  34. Swift XRT and UVOT observations of GRB080414
  35. GRB 080319B: Jet Break, Energetics, Supernova
  36. GRB 080413B: Faulkes Telescope South optical afterglow observations
  37. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  38. GRB 080413A: Suzaku WAM observation of the prompt emission
  39. GRB 080413B: Suzaku WAM observation of the prompt emission
  40. GRB 080413A: MOA-II optical afterglow observations
  41. GRB 080319B: Continued Gemini-N monitoring
  42. GRB 080414: RTT150 optical observations
  43. GRB 080414 Watcher observations
  44. VLA radio observations of GRB 080413B
  45. GRB 080413A: Gemini-South Spectroscopy
  46. GRB 080413B: Gemini-South Spectroscopy
  47. VLA radio observations of GRB 080413A
  48. GRB 080413B: Ep,i-Eiso correlation
  49. GRB080413B
  50. Swift-BAT spectral lag analysis of GRB 080413B
  51. GRB 080413a, SMARTS optical/IR afterglow observations
  52. GRB 080413B: Swift XRT refined analysis
  53. GRB080413A: Swift/UVOT observations
  54. GRB 080413B, Swift-BAT refined analysis
  55. GRB 080413A: Swift-XRT refined analysis
  56. GRB 080413A, Swift-BAT refined analysis
  57. GRB 080413A Bootes observation
  58. GRB 080413A: VLT/UVES redshift
  59. GRB 080413B: VLT redshift
  60. GRB080413B: REM NIR & Optical Observation
  61. GRB 080413B: GROND detection of afterglow in all bands
  62. GRB 080413A: REM detection of the NIR Afterglow
  63. GRB 080413: ROTSE-III Detection of Optical Counterpart
  64. GRB 080411: Swift/UVOT refined analysis
  65. GRB 080411, Swift-BAT refined analysis
  66. GRB 080411: Swift-XRT Refined Analysis
  67. Konus-Wind observation of GRB 080411
  68. GRB 080411: VLT redshift
  69. GRB 080411: GROND detection of optical afterglow candidate
  70. GRB080330: MAGIC telescope GeV observation
  71. GRB 080330: Swift-XRT refined position retraction
  72. GRB 080409: Swift-BAT refined analysis
  73. GRB 080408: GROND detection of optical/NIR afterglow candidate
  74. GRB 080330 optical observations
  75. Swift/UVOT observations of GRB080409
  76. GRB 080409: Swift XRT refined analysis
  77. UVOT/Swift Observations of GRB080408
  78. GRB 080408: Swift-XRT position of a possible afterglow
  79. GRB 080409: REM optical/NIR observations
  80. GRB 080408: Analysis of AGILE Gamma-ray data
  81. GRB 080319A: Early RAPTOR optical limits
  82. GRB 080319B: HST observations
  83. GRB 080330: RAPTOR detection of prompt optical flash
  84. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  85. GRB 080405: Swift-BAT refined analysis
  86. GRB 080405: Swift-XRT position
  87. GRB 080325: optical upper limit
  88. GRB 080328: GAO 150cm telescope Optical Observation
  89. GRB080330: Improved Swift XRT Position
  90. GRB 080330: Prompt PROMPT Observations
  91. GRB080330: optical observations
  92. GRB 080319B: TORTORA light curve (Correction)
  93. GRB080328, RIMOTS optical upper limit
  94. GRB080330: optical observations
  95. GRB080330: Swift XRT refined analysis
  96. GRB 080330: REM optical observations
  97. GRB 080330, SMARTS optical/IR afterglow observations
  98. GRB 080330 Swift-UVOT refined analysis
  99. GRB 080328: Suzaku WAM observation of the prompt emission
  100. GRB080330: TNT optical observations

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