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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"

34313 results found.

  1. GRB 080903: Enhanced Swift-XRT position
  2. GRB 080903, Swift-BAT refined analysis
  3. GRB 080903: optical observations
  4. GRB 080903: Liverpool Telescope observations
  5. GRB 080903: Astrotel-Caucasus optical observations
  6. GRB 080903: Optical afterglow candidate
  7. GRB 080903: TAROT Calern observatory optical observations
  8. GRB 080903: ROTSE-III Optical Limits
  9. GRB 080903: Swift detection of a burst
  10. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  11. GRB080828: Swift/UVOT Upper Limits
  12. GRB080825B: Swift/UVOT Upper Limits
  13. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  14. Swift-BAT trigger 322590 is not a GRB
  15. Swift trigger 322590: BAT detection of a possible burst
  16. GRB 080828: SuperAGILE GRB Localization
  17. GRB080823: Fermi Gamma-ray Burst Monitor detection
  18. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  19. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  20. Konus-Wind observation of GRB 080825B
  21. GRB080825C: GLAST Burst Monitor detection
  22. GRB 080825B: Swift-XRT team analysis
  23. GRB080825: Afterglow confirmation and redshift estimate
  24. GRB 080825B - optical counterpart candidate
  25. GRB 080825B: GRB Localization by SuperAGILE
  26. GRB 080822B, Swift-BAT refined analysis
  27. GRB 080822B: MASTER optical observation
  28. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  29. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  30. GRB 080822B: Swift detection of a burst
  31. GRB080818B: GLAST Burst Monitor detection
  32. GRB 080822 (SGR 0501+4516): archival optical observations
  33. New Soft Gamma Repeater 0501+4516 was GRB 080822
  34. GRB 080822: Swift detection of a short burst
  35. GLAST Burst Monitor detection of a GRB: 080816B
  36. GLAST Burst Monitor detection of GRB 080818
  37. GLAST Burst Monitor detection of GRB080817B
  38. GLAST Burst Monitor detection of GRB 080817
  39. GLAST Burst Monitor detection of GRB080816
  40. GRB080810 - optical observations
  41. GRB080810: optical observations
  42. GLAST Burst Monitor detection of GRB 080812
  43. Radio detection of GRB 080810 with the VLA
  44. GRB 080810: RTT150 optical observations
  45. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  46. GLAST Burst Monitor detection of GRB 080810
  47. GRB 080810: Liverpool and Faulkes North observations
  48. GRB 080810: RTT150 optical observations
  49. GRB080810: MITSuME optical observation
  50. First GLAST Burst Monitor GRB Circulars
  51. GRB 080810: Swift/UVOT Refined Analysis
  52. GRB 080810: optical observations
  53. GRB 080810: Liverpool Telescope observations
  54. GRB 080810: D50 optical observation
  55. GRB 080810: Kanazawa optical observation
  56. GRB 080810: OSN follow-up
  57. GRB 080810: Observations from NOT
  58. GRB 080810: RTT150 optical observations
  59. GRB 080810: Swift-XRT Team refined analysis
  60. GRB 080810: Enhanced Swift-XRT position
  61. GRB 080810: KANATA optical-NIR observation, update
  62. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  63. GRB 080810: Keck/HIRES Spectroscopy
  64. GRB 080810, Swift-BAT refined analysis
  65. GRB 080810 : optical observation with KANATA
  66. GRB 080810: Swift detection of a burst with a bright optical afterglow
  67. GRB 080723B: GROND upper limits
  68. GRB 080723B: XMM-Newton observation
  69. GRB 080805: VLT redshift update
  70. GRB 080805: Faulkes Telescope South optical observations
  71. GRB 080804: GROND observations
  72. GRB 080727B: Late VLT imaging
  73. GRB 080804: ATCA Radio Observations
  74. GRB 080805: Swift-XRT Refined Analysis
  75. GRB 080805: Swift/UVOT Upper Limits
  76. GRB 080804: Swift-XRT Refined Analysis
  77. GRB 080804: Swift/UVOT Refined Analysis
  78. GRB 080805, Swift-BAT refined analysis
  79. GRB 080804, Swift-BAT refined analysis
  80. GRB 080804: Enhanced Swift-XRT position
  81. GRB080804: Gemini South redshift confirmation
  82. GRB 080804: Faulkes Telescope South observations
  83. GRB080805 optical limit by "Pi of the Sky"
  84. GRB 080805: VLT redshift
  85. GRB 080805: Afterglow confirmation
  86. GRB 080805: GROND detection of possible afterglow
  87. GRB 080805: Swift detection of a burst
  88. GRB 080804: UVES redshift
  89. GRB 080804: Swift detection of a burst with optical afterglow
  90. GRB 080804: ROTSE-III Detection of Optical Counterpart
  91. GRB 080802: Swift/UVOT Upper Limits
  92. GRB 080802: Swift-XRT Refined Analysis
  93. GRB 080802: UVI Telescope Upper Limit
  94. GRB 080802, Swift-BAT refined analysis
  95. GRB 080802: Swift detection of a probable burst
  96. GRB 080727C: Suzaku WAM observation of the prompt emission
  97. GRB 080727B: IR photometry
  98. GRB 080727A: Early IR observations
  99. GRB 080727C: TAROT Calern observatory optical observations
  100. GRB 080727B: KAIT photometry and an early lightcurve break

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