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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"

35436 results found.

  1. GRB 080607: Super-LOTIS early observations
  2. GRB 080607: Swift detection of a burst with optical afterglow
  3. GRB 080607: ROTSE-III Detection of Optical Counterpart
  4. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  5. GRB 080605: Swift-UVOT refined analysis
  6. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  7. GRB 080604: VLA radio upper limit
  8. GRB 080605, Swift-BAT refined analysis
  9. GRB 080603B: VLA radio upper limit
  10. GRB 080605, Swift-BAT refined analysis
  11. GRB 080605: Swift-XRT refined analysis
  12. GRB080605: observation by BOOTES
  13. GRB 080605: MASTER VWF 46 s AT observation
  14. GRB 080605: Enhanced Swift-XRT position
  15. GRB 080605: GROND detection of the optical afterglow candidate
  16. GRB080605: optical observations
  17. GRB 080605: VLT redshift
  18. GRB 080605: Liverpool Telescope optical afterglow candidate
  19. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  20. GRB 080605: TLS RRM Afterglow
  21. GRB 080605: Swift detection of a burst with an optical afterglow
  22. GRB 080603B: PAIRITEL infrared detection
  23. GRB 080603A: PAIRITEL infrared detection
  24. GRB 080604: Xinglong R band observation
  25. GRB 080603A: Xinglong R band observation
  26. GRB 080603B: TLS Afterglow Observation
  27. GRB 080603A: TLS Afterglow Observation
  28. GRB 080604: MITSuME Okayama observation
  29. GRB 080604: Gemini-North spectroscopy
  30. GRB 080604, Swift-BAT refined analysis
  31. GRB 080604: Swift-XRT refined analysis
  32. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  33. GRB 080603B : Xinglong EST observations
  34. GRB 080603B : Liverpool Telescope Observations
  35. Konus-Wind observation of GRB 080603B
  36. GRB 080603B: Swift-XRT refined analysis
  37. GRB 080603A: Swift-XRT detection of the afterglow
  38. GRB 080430: optical observations
  39. GRB 080603B: Swift/UVOT detection of the afterglow
  40. GRB 080604: Enhanced Swift-XRT position
  41. GRB 080603B, Swift-BAT refined analysis
  42. GRB 080604: Hobby-Eberly Telescope spectroscopy
  43. GRB 080603A: Swift/UVOT detection of the afterglow
  44. GRB080603B: RTT150 optical observations, break in light curves
  45. GRB 080604: Early Super-LOTIS Observations
  46. GRB 080604: Swift detection of a burst with an optical afterglow
  47. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  48. GRB 080516: TAROT La Silla observatory optical observations
  49. GRB080603B: NOT redshift
  50. GRB 080603B: BOOTES2/TELMA optical observations
  51. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  52. GRB 080603B: Swift detection of a burst with optical afterglow
  53. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  54. GRB 080603: Gemini-North redshift
  55. GRB 080603: A long GRB detected by INTEGRAL
  56. GRB 080603 OA candidate
  57. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  58. GRB 080602, Swift-BAT refined analysis
  59. GRB 080602: Swift-XRT refined analysis
  60. Konus-Wind observation of GRB 080602
  61. GRB 080602: NOT R-band upper limit
  62. GRB 080602: Enhanced Swift-XRT position
  63. GRB 080602: Swift detection of a burst
  64. Swift analysis of BAT Slew Survey event (Trigger=009)
  65. GRB 080523: afterglow confirmation and redshift constraints
  66. Reactivation of SGR 1627-41
  67. GRB 080524: Swift XRT and UVOT analysis
  68. GRB 080503: 2nd Epoch Chandra X-ray Observations
  69. GRB 080524: Swift-BAT detection of a burst in ground analysis
  70. GRB 080523: Swift-XRT refined analysis
  71. GRB 080523, Swift-BAT refined analysis
  72. GRB 080520: VLT host detection
  73. GRB 080523: VLT optical observations
  74. Swift/UVOT observations of GRB 080523
  75. GRB 080523: Enhanced Swift-XRT position
  76. GRB 080523: Swift detection of a burst
  77. GRB 080515: NIR magnitude correction
  78. GRB 080515: KPNO 4m NIR afterglow detection
  79. GRB 80516: Swift/UVOT Observations
  80. GRB 080515: Swift-XRT position and analysis
  81. GRB 080520, Swift-BAT refined analysis
  82. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  83. GRB 080514B: UVOT Observations
  84. GRB080520: Swift/UVOT observations
  85. GRB 080520: VLT redshift
  86. GRB 080520, GROND observations
  87. GRB 080520: Enhanced Swift-XRT position
  88. GRB 080520: Swift XRT Refined Analysis
  89. GRB 080520: Swift detection of a burst with optical afterglow
  90. GRB 080514B: Suzaku WAM observation of the prompt emission
  91. Konus-Wind observation of GRB 080514B
  92. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  93. GRB 080503: Further HST imaging
  94. GRB 080517, Swift-BAT refined analysis
  95. GRB 080516, GROND further analysis
  96. GRB 080517: Swift-XRT refined analysis
  97. GRB 080514B: Further NIR observations
  98. GRB 080517: Enhanced Swift-XRT position
  99. GRB080517: Liverpool Telescope Optical Observations
  100. GRB 080517: Swift detection of a burst

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