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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"

27391 results found.

  1. GRB 080822B, Swift-BAT refined analysis
  2. SGR 0501+4516: Astrotel-Caucasus optical observations
  3. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  4. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  5. SGR 0501+4516: optical observations
  6. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  7. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  8. GRB080818B: GLAST Burst Monitor detection
  9. GRB 080822: Swift detection of a short burst
  10. GLAST Burst Monitor detection of a GRB: 080816B
  11. GLAST Burst Monitor detection of GRB 080818
  12. GLAST Burst Monitor detection of GRB080817B
  13. GLAST Burst Monitor detection of GRB 080817
  14. GLAST Burst Monitor detection of GRB080816
  15. GRB080810 - optical observations
  16. GLAST Burst Monitor detection of GRB 080812
  17. Radio detection of GRB 080810 with the VLA
  18. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  19. GLAST Burst Monitor detection of GRB 080810
  20. First GLAST Burst Monitor GRB Circulars
  21. GRB 080810: Swift/UVOT Refined Analysis
  22. GRB 080810: Liverpool Telescope observations
  23. GRB 080810: Kanazawa optical observation
  24. GRB 080810: OSN follow-up
  25. GRB 080810: Swift-XRT Team refined analysis
  26. GRB 080810: Enhanced Swift-XRT position
  27. GRB 080810: KANATA optical-NIR observation, update
  28. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  29. GRB 080810, Swift-BAT refined analysis
  30. GRB 080810 : optical observation with KANATA
  31. GRB 080810: Swift detection of a burst with a bright optical afterglow
  32. GRB 080723B: GROND upper limits
  33. GRB 080723B: XMM-Newton observation
  34. GRB 080805: Faulkes Telescope South optical observations
  35. GRB 080804: GROND observations
  36. GRB 080727B: Late VLT imaging
  37. GRB 080805: Swift-XRT Refined Analysis
  38. GRB 080805: Swift/UVOT Upper Limits
  39. GRB 080804: Swift-XRT Refined Analysis
  40. GRB 080804: Swift/UVOT Refined Analysis
  41. GRB 080805, Swift-BAT refined analysis
  42. GRB 080804, Swift-BAT refined analysis
  43. GRB 080804: Enhanced Swift-XRT position
  44. GRB 080804: Faulkes Telescope South observations
  45. GRB080805 optical limit by "Pi of the Sky"
  46. GRB 080805: Afterglow confirmation
  47. GRB 080805: GROND detection of possible afterglow
  48. GRB 080805: Swift detection of a burst
  49. GRB 080804: Swift detection of a burst with optical afterglow
  50. GRB 080804: ROTSE-III Detection of Optical Counterpart
  51. GRB 080802: Swift/UVOT Upper Limits
  52. GRB 080802: UVI Telescope Upper Limit
  53. GRB 080802, Swift-BAT refined analysis
  54. GRB 080802: Swift detection of a probable burst
  55. GRB 080727C: Suzaku WAM observation of the prompt emission
  56. GRB 080727B: IR photometry
  57. GRB 080727C: TAROT Calern observatory optical observations
  58. GRB 080727B: KAIT photometry and an early lightcurve break
  59. GRB 080727C, Swift-BAT refined analysis
  60. GRB 080727C: Swift/UVOT Upper Limits
  61. GRB 080727C: Swift XRT refined analysis
  62. GRB 080727C: Liverpool Telescope observations
  63. GRB 080727A: VLT upper limits
  64. GRB 080727C: Enhanced Swift-XRT position
  65. GRB080727C: RTT150 optical observations
  66. GRB 080727C: Swift detection of a burst
  67. Swift detection of XTE J1701-407
  68. GRB 080727B: Swift/UVOT Upper Limits
  69. BAT Trigger 318150 is not a GRB
  70. GRB 080727B: Swift-XRT refined analysis
  71. GRB 080727B, Swift-BAT refined analysis
  72. GRB 080727A, Swift-BAT refined analysis
  73. GRB 080727A: Swift-XRT refined analysis
  74. GRB080727A: Swift/UVOT Upper Limits
  75. GRB 080727B: Enhanced Swift-XRT position
  76. GRB 080727A: Enhanced Swift-XRT position
  77. GRB 080727B: REM prompt observations
  78. GRB 080727B: Swift detection of a bright burst
  79. GRB 080727: Swift detection of a burst
  80. GRB 080726: GRB Localization by SuperAGILE
  81. GRB 080725, Swift-BAT refined analysis
  82. GRB 080723A: optical upper limit
  83. GRB080723B: Swift/UVOT Upper Limits
  84. GRB 080725: REM prompt observations
  85. GRB 080723A: Swift/UVOT Upper Limits
  86. VLA radio upper limit on GRB 080721
  87. GRB 080723B - correction to flux conversion factor
  88. GRB 080723B - Swift-XRT refined analysis
  89. GRB 080723, Swift-BAT refined analysis
  90. GRB 080723B: AGILE GRID and MCAL results
  91. GRB 080723A: Swift-XRT refined analysis
  92. GRB 080723B: Detection and Localization by SuperAGILE
  93. GRB 080723: Enhanced Swift-XRT position
  94. GRB 080723: Swift detection of a burst
  95. GRB 080721 : Lulin 2nd optical follow-ups
  96. GRB 080721: Swift-XRT refined analysis
  97. GRB 080721: Enhanced Swift-XRT position
  98. GRB 080721, Swift-BAT refined analysis
  99. GRB 080721 : Lulin Optical follow-ups
  100. GRB 080721: Swift detection of a burst with a bright optical counterpart.

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