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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"

26499 results found.

  1. GRB 080607: Swift-XRT refined analysis
  2. GRB 080605: optical observations
  3. VLA detection of INTEGRAL burst GRB 080603A
  4. Konus-Wind observation of GRB 080605
  5. GRB 080607: Enhanced Swift-XRT position
  6. GRB 080605: GROND 2nd epoch observations
  7. GRB 080607: Keck/LRIS spectroscopy and redshift
  8. GRB 080607: Swift detection of a burst with optical afterglow
  9. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  10. GRB 080605: Swift-UVOT refined analysis
  11. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  12. GRB 080604: VLA radio upper limit
  13. GRB 080605, Swift-BAT refined analysis
  14. GRB 080603B: VLA radio upper limit
  15. GRB 080605, Swift-BAT refined analysis
  16. GRB 080605: Swift-XRT refined analysis
  17. GRB080605: observation by BOOTES
  18. GRB 080605: MASTER VWF 46 s AT observation
  19. GRB 080605: Enhanced Swift-XRT position
  20. GRB 080605: GROND detection of the optical afterglow candidate
  21. GRB 080605: Liverpool Telescope optical afterglow candidate
  22. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  23. GRB 080605: Swift detection of a burst with an optical afterglow
  24. GRB 080603B: TLS Afterglow Observation
  25. GRB 080603A: TLS Afterglow Observation
  26. GRB 080604: MITSuME Okayama observation
  27. GRB 080604, Swift-BAT refined analysis
  28. GRB 080604: Swift-XRT refined analysis
  29. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  30. GRB 080603B : Liverpool Telescope Observations
  31. Konus-Wind observation of GRB 080603B
  32. GRB 080603B: Swift-XRT refined analysis
  33. GRB 080603A: Swift-XRT detection of the afterglow
  34. GRB 080604: Enhanced Swift-XRT position
  35. GRB 080604: Swift detection of a burst with an optical afterglow
  36. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  37. GRB 080516: TAROT La Silla observatory optical observations
  38. GRB080603B: NOT redshift
  39. GRB 080603B: BOOTES2/TELMA optical observations
  40. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  41. GRB 080603B: Swift detection of a burst with optical afterglow
  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-XRT refined analysis
  46. Konus-Wind observation of GRB 080602
  47. GRB 080602: NOT R-band upper limit
  48. GRB 080602: Enhanced Swift-XRT position
  49. GRB 080602: Swift detection of a burst
  50. Swift analysis of BAT Slew Survey event (Trigger=009)
  51. GRB 080523: afterglow confirmation and redshift constraints
  52. Konus-Wind observation of reactivation of SGR 1627-41
  53. 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 080514B: UVOT Observations
  66. GRB080520: Swift/UVOT observations
  67. GRB 080520, GROND observations
  68. GRB 080520: Enhanced Swift-XRT position
  69. GRB 080520: Swift XRT Refined Analysis
  70. GRB 080520: Swift detection of a burst with optical afterglow
  71. GRB 080514B: Suzaku WAM observation of the prompt emission
  72. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  73. GRB 080517, Swift-BAT refined analysis
  74. GRB 080517: Swift-XRT refined analysis
  75. GRB 080514B: Further NIR observations
  76. GRB 080517: Enhanced Swift-XRT position
  77. GRB080517: Liverpool Telescope Optical Observations
  78. GRB 080517: Swift detection of a burst
  79. GRB 080516, GROND 2nd epoch observations
  80. GRB 080516, GROND observations
  81. GRB 080516, SMARTS optical/IR observations
  82. GRB 080516: Swift-XRT Team refined analysis
  83. GRB 080516: Enhanced Swift-XRT position
  84. GRB 080516: Swift detection of a burst
  85. Errartum: VLA upper limit on GRB 080507
  86. VLA upper limit on GRB 080705
  87. GRB 080514B : redshift estimation
  88. Konus-Wind observation of GRB 080513
  89. IPN triangulation of bright GRB 080513
  90. GRB 080515, Swift-BAT refined analysis
  91. GRB 080514B: slow fading behaviour ?
  92. GRB 080514B: Swift-XRT analysis
  93. GRB 080514B, GROND observations
  94. GRB 080515: Swift detection of a burst
  95. GRB 080514B: Watcher observations
  96. GRB 080514B: possible AGILE detection at E>50 MeV
  97. GRB 080514B: SuperAGILE/IPN GRB Localization
  98. procesure for GRB Circular
  99. Swift detection of a possible galactic transient
  100. GRB080514: REM NIR & Optical Observations

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