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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"

28048 results found.

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

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