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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"

26189 results found.

  1. GRB 080607: Enhanced Swift-XRT position
  2. GRB 080607, Swift-BAT refined analysis
  3. GRB 080605: GROND 2nd epoch observations
  4. GRB 080607: Keck/LRIS spectroscopy and redshift
  5. GRB 080607: Swift detection of a burst with optical afterglow
  6. GRB 080607: ROTSE-III Detection of Optical Counterpart
  7. GRB 080605: Swift-UVOT refined analysis
  8. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  9. GRB 080604: VLA radio upper limit
  10. GRB 080605, Swift-BAT refined analysis
  11. GRB 080603B: VLA radio upper limit
  12. GRB 080605, Swift-BAT refined analysis
  13. GRB 080605: Swift-XRT refined analysis
  14. GRB 080605: MASTER VWF 46 s AT observation
  15. GRB 080605: Enhanced Swift-XRT position
  16. GRB 080605: GROND detection of the optical afterglow candidate
  17. GRB 080605: Liverpool Telescope optical afterglow candidate
  18. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  19. GRB 080605: Swift detection of a burst with an optical afterglow
  20. GRB 080603B: TLS Afterglow Observation
  21. GRB 080603A: TLS Afterglow Observation
  22. GRB 080604: MITSuME Okayama observation
  23. GRB 080604, Swift-BAT refined analysis
  24. GRB 080604: Swift-XRT refined analysis
  25. GRB 080603B : Liverpool Telescope Observations
  26. Konus-Wind observation of GRB 080603B
  27. GRB 080603B: Swift-XRT refined analysis
  28. GRB 080603A: Swift-XRT detection of the afterglow
  29. GRB 080430: optical observations
  30. GRB 080603B: Swift/UVOT detection of the afterglow
  31. GRB 080604: Enhanced Swift-XRT position
  32. GRB 080603B, Swift-BAT refined analysis
  33. GRB080603B: RTT150 optical observations, break in light curves
  34. GRB 080604: Swift detection of a burst with an optical afterglow
  35. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  36. GRB 080516: TAROT La Silla observatory optical observations
  37. GRB080603B: NOT redshift
  38. GRB 080603B: BOOTES2/TELMA optical observations
  39. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  40. GRB 080603B: Swift detection of a burst with optical afterglow
  41. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  42. GRB 080603: A long GRB detected by INTEGRAL
  43. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  44. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  45. GRB 080602, Swift-BAT refined analysis
  46. GRB 080602: Swift-XRT refined analysis
  47. Konus-Wind observation of GRB 080602
  48. GRB 080602: NOT R-band upper limit
  49. GRB 080602: Enhanced Swift-XRT position
  50. GRB 080602: Swift detection of a burst
  51. Swift analysis of BAT Slew Survey event (Trigger=009)
  52. GRB 080523: afterglow confirmation and redshift constraints
  53. Konus-Wind observation of reactivation of SGR 1627-41
  54. GRB 080524: Swift XRT and UVOT analysis
  55. GRB 080503: 2nd Epoch Chandra X-ray Observations
  56. GRB 080524: Swift-BAT detection of a burst in ground analysis
  57. GRB 080523: Swift-XRT refined analysis
  58. GRB 080523, Swift-BAT refined analysis
  59. GRB 080523: VLT optical observations
  60. GRB 080523: Enhanced Swift-XRT position
  61. GRB 080523: Swift detection of a burst
  62. GRB 080515: KPNO 4m NIR afterglow detection
  63. GRB 80516: Swift/UVOT Observations
  64. GRB 080515: Swift-XRT position and analysis
  65. GRB 080520, Swift-BAT refined analysis
  66. GRB 080514B: UVOT Observations
  67. GRB080520: Swift/UVOT observations
  68. GRB 080520, GROND observations
  69. GRB 080520: Enhanced Swift-XRT position
  70. GRB 080520: Swift XRT Refined Analysis
  71. GRB 080520: Swift detection of a burst with optical afterglow
  72. GRB 080514B: Suzaku WAM observation of the prompt emission
  73. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  74. GRB 080517, Swift-BAT refined analysis
  75. GRB 080517: Swift-XRT refined analysis
  76. GRB 080514B: Further NIR observations
  77. GRB 080517: Enhanced Swift-XRT position
  78. GRB080517: Liverpool Telescope Optical Observations
  79. GRB 080517: Swift detection of a burst
  80. GRB 080516, GROND 2nd epoch observations
  81. GRB 080516, GROND observations
  82. GRB 080516, SMARTS optical/IR observations
  83. GRB 080516: Swift-XRT Team refined analysis
  84. GRB 080516, Swift-BAT refined analysis
  85. GRB 080516: Enhanced Swift-XRT position
  86. GRB 080516: Swift detection of a burst
  87. Errartum: VLA upper limit on GRB 080507
  88. VLA upper limit on GRB 080705
  89. GRB 080514B : redshift estimation
  90. IPN triangulation of bright GRB 080513
  91. GRB 080515, Swift-BAT refined analysis
  92. GRB 080514B: slow fading behaviour ?
  93. GRB 080514B: Swift-XRT analysis
  94. GRB 080514B, GROND observations
  95. GRB 080515: Swift detection of a burst
  96. GRB 080514B: Afterglow candidate
  97. GRB 080514B: Watcher observations
  98. GRB 080514B: possible AGILE detection at E>50 MeV
  99. GRB 080514B: SuperAGILE/IPN GRB Localization
  100. procesure for GRB Circular

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