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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"
  1. GRB 080430: optical observations
  2. GRB 080603B: Swift/UVOT detection of the afterglow
  3. GRB 080604: Enhanced Swift-XRT position
  4. GRB 080603B, Swift-BAT refined analysis
  5. GRB 080604: Hobby-Eberly Telescope spectroscopy
  6. GRB 080603A: Swift/UVOT detection of the afterglow
  7. GRB080603B: RTT150 optical observations, break in light curves
  8. GRB 080604: Early Super-LOTIS Observations
  9. GRB080604: confirmation of optical afterglow
  10. GRB 080604: Swift detection of a burst with an optical afterglow
  11. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  12. GRB 080516: TAROT La Silla observatory optical observations
  13. GRB080603B: NOT redshift
  14. GRB 080603B: BOOTES2/TELMA optical observations
  15. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  16. GRB 080603B: Swift detection of a burst with optical afterglow
  17. GRB080603: Super-LOTIS detection of Optical Counterpart
  18. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  19. GRB 080603: Gemini-North redshift
  20. GRB 080603: A long GRB detected by INTEGRAL
  21. GRB 080603 OA candidate
  22. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  23. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  24. GRB 080602, Swift-BAT refined analysis
  25. GRB 080602: Swift-XRT refined analysis
  26. Konus-Wind observation of GRB 080602
  27. GRB 080602: NOT R-band upper limit
  28. GRB 080602: Enhanced Swift-XRT position
  29. GRB 080602: Swift detection of a burst
  30. Swift analysis of BAT Slew Survey event (Trigger=009)
  31. GRB 080523: afterglow confirmation and redshift constraints
  32. Konus-Wind observation of reactivation of SGR 1627-41
  33. Reactivation of SGR 1627-41
  34. GRB 080524: Swift XRT and UVOT analysis
  35. GRB 080503: 2nd Epoch Chandra X-ray Observations
  36. GRB 080524: Swift-BAT detection of a burst in ground analysis
  37. GRB 080523: Swift-XRT refined analysis
  38. GRB 080523, Swift-BAT refined analysis
  39. GRB 080520: VLT host detection
  40. GRB 080523: VLT optical observations
  41. Swift/UVOT observations of GRB 080523
  42. GRB 080523: Enhanced Swift-XRT position
  43. GRB 080523: Swift detection of a burst
  44. GRB 080515: NIR magnitude correction
  45. GRB 080515: KPNO 4m NIR afterglow detection
  46. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  47. GRB 80516: Swift/UVOT Observations
  48. GRB 080515: Swift-XRT position and analysis
  49. GRB 080520, Swift-BAT refined analysis
  50. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  51. GRB 080514B: UVOT Observations
  52. GRB080520: Swift/UVOT observations
  53. GRB 080520: VLT redshift
  54. GRB 080520, GROND observations
  55. GRB 080520: Enhanced Swift-XRT position
  56. GRB 080520: Swift XRT Refined Analysis
  57. GRB 080520: Swift detection of a burst with optical afterglow
  58. GRB 080514B: Suzaku WAM observation of the prompt emission
  59. Konus-Wind observation of GRB 080514B
  60. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  61. GRB 080503: Further HST imaging
  62. GRB 080517, Swift-BAT refined analysis
  63. GRB 080516, GROND further analysis
  64. GRB 080517: Swift-XRT refined analysis
  65. GRB 080514B: Further NIR observations
  66. GRB 080517: Enhanced Swift-XRT position
  67. GRB080517: Liverpool Telescope Optical Observations
  68. GRB 080517: Swift detection of a burst
  69. GRB 080516, GROND 2nd epoch observations
  70. GRB 080516, GROND observations
  71. GRB080430: optical observations
  72. GRB 080516, SMARTS optical/IR observations
  73. GRB 080516: Swift-XRT Team refined analysis
  74. GRB 080516, Swift-BAT refined analysis
  75. GRB 080516: Enhanced Swift-XRT position
  76. GRB 080514B: NOT observations
  77. GRB 080516: Swift detection of a burst
  78. Errartum: VLA upper limit on GRB 080507
  79. VLA upper limit on GRB 080705
  80. GRB 080514B : redshift estimation
  81. Konus-Wind observation of GRB 080513
  82. IPN triangulation of bright GRB 080513
  83. Swift-BAT refined analysis for Trigger 311603: Galactic source
  84. GRB 080515, Swift-BAT refined analysis
  85. GRB 080514B: KPNO 4m IR observations
  86. GRB 080514B: slow fading behaviour ?
  87. GRB 080514B: Swift-XRT analysis
  88. GRB 080514B, GROND observations
  89. GRB 080515: Swift detection of a burst
  90. GRB 080514B: Finding chart
  91. GRB 080514B: Afterglow candidate
  92. GRB 080514B: Watcher observations
  93. GRB 080430
  94. GRB 080514B: possible AGILE detection at E>50 MeV
  95. GRB 080514B: SuperAGILE/IPN GRB Localization
  96. procesure for GRB Circular
  97. Swift detection of a possible galactic transient
  98. GRB080514: REM NIR & Optical Observations
  99. Konus-Wind observation of GRB 080507
  100. GRB 080319B: Further HST observations and underlying host

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