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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

42807 results found.

  1. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  2. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  3. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  4. GRB 080822B: Swift detection of a burst
  5. GRB080818B: GLAST Burst Monitor detection
  6. Third event from SGR 0501+4516
  7. GRB 080822 (SGR 0501+4516): archival optical observations
  8. New Soft Gamma Repeater 0501+4516 was GRB 080822
  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. GRB080810: optical observations
  17. GLAST Burst Monitor detection of GRB 080812
  18. Radio detection of GRB 080810 with the VLA
  19. GRB 080810: RTT150 optical observations
  20. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  21. GLAST Burst Monitor detection of GRB 080810
  22. GRB 080810: Liverpool and Faulkes North observations
  23. GRB 080810: RTT150 optical observations
  24. First GLAST Burst Monitor GRB Circulars
  25. GRB 080810: Swift/UVOT Refined Analysis
  26. GRB 080810: optical observations
  27. GRB 080810: Liverpool Telescope observations
  28. GRB 080810: OSN follow-up
  29. GRB 080810: Observations from NOT
  30. GRB 080810: RTT150 optical observations
  31. GRB 080810: Swift-XRT Team refined analysis
  32. GRB 080810: Enhanced Swift-XRT position
  33. GRB 080810: KANATA optical-NIR observation, update
  34. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  35. GRB 080810: Keck/HIRES Spectroscopy
  36. GRB 080810, Swift-BAT refined analysis
  37. GRB 080810 : optical observation with KANATA
  38. GRB 080810: Swift detection of a burst with a bright optical afterglow
  39. GRB 080723B: GROND upper limits
  40. GRB 080723B: XMM-Newton observation
  41. GRB 080805: VLT redshift update
  42. GRB 080805: Faulkes Telescope South optical observations
  43. GRB 080804: GROND observations
  44. GRB 080727B: Late VLT imaging
  45. GRB 080804: ATCA Radio Observations
  46. GRB 080805: Swift-XRT Refined Analysis
  47. GRB 080805: Swift/UVOT Upper Limits
  48. GRB 080804: Swift-XRT Refined Analysis
  49. GRB 080805, Swift-BAT refined analysis
  50. GRB 080804, Swift-BAT refined analysis
  51. GRB 080804: Enhanced Swift-XRT position
  52. GRB080804: Gemini South redshift confirmation
  53. GRB 080804: Faulkes Telescope South observations
  54. GRB 080805: VLT redshift
  55. GRB 080805: Afterglow confirmation
  56. GRB 080805: GROND detection of possible afterglow
  57. GRB 080805: Swift detection of a burst
  58. GRB 080804: UVES redshift
  59. GRB 080804: Swift detection of a burst with optical afterglow
  60. GRB 080804: ROTSE-III Detection of Optical Counterpart
  61. GRB 080802: Swift/UVOT Upper Limits
  62. GRB 080802: Swift-XRT Refined Analysis
  63. GRB 080802: UVI Telescope Upper Limit
  64. GRB 080802, Swift-BAT refined analysis
  65. GRB 080802: Swift detection of a probable burst
  66. GRB 080727C: Suzaku WAM observation of the prompt emission
  67. GRB 080727B: IR photometry
  68. GRB 080727A: Early IR observations
  69. GRB 080727C: TAROT Calern observatory optical observations
  70. GRB 080727B: KAIT photometry and an early lightcurve break
  71. GRB 080727B: GROND redshift limit
  72. GRB 080727C, Swift-BAT refined analysis
  73. GRB 080727C: Swift/UVOT Upper Limits
  74. Konus-Wind observation of GRB 080727B
  75. GRB 080727C: Swift XRT refined analysis
  76. GRB 080727C: Liverpool Telescope observations
  77. GRB 080727A: VLT upper limits
  78. GRB 080727C: Enhanced Swift-XRT position
  79. GRB 080727B: REM NIR afterglow prompt detection
  80. GRB 080727C: Swift detection of a burst
  81. Swift detection of XTE J1701-407
  82. GRB 080727B: Swift/UVOT Upper Limits
  83. BAT Trigger 318150 is not a GRB
  84. GRB 080727B: Swift-XRT refined analysis
  85. GRB 080727B, Swift-BAT refined analysis
  86. GRB 080727A, Swift-BAT refined analysis
  87. GRB 080727A: Swift-XRT refined analysis
  88. GRB080727A: Swift/UVOT Upper Limits
  89. GRB 080727B: Enhanced Swift-XRT position
  90. GRB 080727A: Enhanced Swift-XRT position
  91. GRB 080727B: KAIT observations
  92. GRB 080727B: REM prompt observations
  93. GRB 080727B: Swift detection of a bright burst
  94. GRB 080727: Swift detection of a burst
  95. GRB 080726: GRB Localization by SuperAGILE
  96. GRB 080725, Swift-BAT refined analysis
  97. GRB 080723A: optical upper limit
  98. GRB080723B: Swift/UVOT Upper Limits
  99. GRB 080725: REM prompt observations
  100. Konus-Wind observation of GRB 080723B

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