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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"

28049 results found.

  1. GRB 080804: Enhanced Swift-XRT position
  2. GRB 080804: Faulkes Telescope South observations
  3. GRB080805 optical limit by "Pi of the Sky"
  4. GRB 080805: Afterglow confirmation
  5. GRB 080805: GROND detection of possible afterglow
  6. GRB 080805: Swift detection of a burst
  7. GRB 080804: Swift detection of a burst with optical afterglow
  8. GRB 080804: ROTSE-III Detection of Optical Counterpart
  9. GRB 080802: Swift/UVOT Upper Limits
  10. GRB 080802: UVI Telescope Upper Limit
  11. GRB 080802, Swift-BAT refined analysis
  12. GRB 080802: Swift detection of a probable burst
  13. GRB 080727C: Suzaku WAM observation of the prompt emission
  14. GRB 080727B: IR photometry
  15. GRB 080727C: TAROT Calern observatory optical observations
  16. GRB 080727B: KAIT photometry and an early lightcurve break
  17. GRB 080727C, Swift-BAT refined analysis
  18. GRB 080727C: Swift/UVOT Upper Limits
  19. GRB 080727C: Swift XRT refined analysis
  20. GRB 080727C: Liverpool Telescope observations
  21. GRB 080727A: VLT upper limits
  22. GRB 080727C: Enhanced Swift-XRT position
  23. GRB080727C: RTT150 optical observations
  24. GRB 080727C: Swift detection of a burst
  25. Swift detection of XTE J1701-407
  26. GRB 080727B: Swift/UVOT Upper Limits
  27. BAT Trigger 318150 is not a GRB
  28. GRB 080727B: Swift-XRT refined analysis
  29. GRB 080727B, Swift-BAT refined analysis
  30. GRB 080727A, Swift-BAT refined analysis
  31. GRB 080727A: Swift-XRT refined analysis
  32. GRB080727A: Swift/UVOT Upper Limits
  33. GRB 080727B: Enhanced Swift-XRT position
  34. GRB 080727A: Enhanced Swift-XRT position
  35. GRB 080727B: REM prompt observations
  36. GRB 080727B: Swift detection of a bright burst
  37. GRB 080727: Swift detection of a burst
  38. GRB 080726: GRB Localization by SuperAGILE
  39. GRB 080725, Swift-BAT refined analysis
  40. GRB 080723A: optical upper limit
  41. GRB080723B: Swift/UVOT Upper Limits
  42. GRB 080725: REM prompt observations
  43. GRB 080723A: Swift/UVOT Upper Limits
  44. VLA radio upper limit on GRB 080721
  45. GRB 080723B - correction to flux conversion factor
  46. GRB 080723B - Swift-XRT refined analysis
  47. GRB 080723, Swift-BAT refined analysis
  48. GRB 080723B: AGILE GRID and MCAL results
  49. GRB 080723A: Swift-XRT refined analysis
  50. GRB 080723B: Detection and Localization by SuperAGILE
  51. GRB 080723: Enhanced Swift-XRT position
  52. GRB 080723: Swift detection of a burst
  53. GRB 080721 : Lulin 2nd optical follow-ups
  54. GRB 080721: Swift-XRT refined analysis
  55. GRB 080721: Enhanced Swift-XRT position
  56. GRB 080721, Swift-BAT refined analysis
  57. GRB 080721 : Lulin Optical follow-ups
  58. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  59. Trigger 317393: Swift detection of a possible GRB
  60. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  61. GRB 080714: GROND confirmation of the optical/NIR afterglow
  62. Konus-Wind observation of GRB 080714
  63. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  64. GRB 080714: Enhanced Swift-XRT position
  65. GRB 080714: Swift-BAT refined analysis
  66. GRB 080714: Swift detection of a burst
  67. GRB 080702A: optical upper limit
  68. GRB 080603A: CrAO optical observations
  69. GRB 080702B: Swift XRT confirmation of the afterglow
  70. GRB 080710: Lick IR detection
  71. GRB 080710, Swift-BAT refined analysis
  72. GRB 0800707: optical observations
  73. GRB 080710: Swift-XRT refined analysis
  74. GRB080710: Swift/UVOT observations
  75. GRB 080710: Enhanced Swift-XRT position
  76. UVOT white band observations of GRB080710
  77. GRB 080710: REM afterglow confirmation & brightening
  78. GRB 080710: Swift XRT position
  79. New Swift-XRT GRB products available online.
  80. GRB 080707: GROND Confirmation of the Optical Afterglow
  81. UVOT observations of GRB080707
  82. GRB 080707, Swift-BAT refined analysis
  83. GRB 080707: Swift XRT refined analysis
  84. GRB 080707: Enhanced Swift-XRT position
  85. GRB 080707: VLT redshift
  86. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  87. GRB 080707: Swift detection of a burst
  88. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  89. Trigger 316063: Swift detection of a transient
  90. GRB 080703: GROND Upper Limits
  91. GRB 080702B: GROND Upper Limits
  92. GRB 080703: UVOT Follow-Up Observation
  93. GRB 080703: VLT observations of the afterglow
  94. GRB 080703: Enhanced Swift-XRT position
  95. GRB 080703, Swift-BAT refined analysis
  96. GRB 080702B Swift-BAT refined analysis
  97. GRB 080703: Swift detection of a burst with optical afterglow
  98. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  99. No radio detection from the short GRB 080702A
  100. Swift/UVOT observation of GRB080702A

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