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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 080603B: TAROT Calern observatory confirmation of slow optical decay
  2. GRB 080516: TAROT La Silla observatory optical observations
  3. GRB080603B: NOT redshift
  4. GRB 080603B: BOOTES2/TELMA optical observations
  5. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  6. GRB 080603B: Swift detection of a burst with optical afterglow
  7. GRB080603: Super-LOTIS detection of Optical Counterpart
  8. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  9. GRB 080603: Gemini-North redshift
  10. GRB 080603: A long GRB detected by INTEGRAL
  11. GRB 080603 OA candidate
  12. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  13. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  14. GRB 080602, Swift-BAT refined analysis
  15. GRB 080602: Swift-XRT refined analysis
  16. Konus-Wind observation of GRB 080602
  17. GRB 080602: NOT R-band upper limit
  18. GRB 080602: Enhanced Swift-XRT position
  19. GRB 080602: Swift detection of a burst
  20. Swift analysis of BAT Slew Survey event (Trigger=009)
  21. GRB 080523: afterglow confirmation and redshift constraints
  22. Konus-Wind observation of reactivation of SGR 1627-41
  23. Reactivation of SGR 1627-41
  24. GRB 080524: Swift XRT and UVOT analysis
  25. GRB 080503: 2nd Epoch Chandra X-ray Observations
  26. GRB 080524: Swift-BAT detection of a burst in ground analysis
  27. GRB 080523: Swift-XRT refined analysis
  28. GRB 080523, Swift-BAT refined analysis
  29. GRB 080520: VLT host detection
  30. GRB 080523: VLT optical observations
  31. Swift/UVOT observations of GRB 080523
  32. GRB 080523: Enhanced Swift-XRT position
  33. GRB 080523: Swift detection of a burst
  34. GRB 080515: NIR magnitude correction
  35. GRB 080515: KPNO 4m NIR afterglow detection
  36. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  37. GRB 80516: Swift/UVOT Observations
  38. GRB 080515: Swift-XRT position and analysis
  39. GRB 080520, Swift-BAT refined analysis
  40. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  41. GRB 080514B: UVOT Observations
  42. GRB080520: Swift/UVOT observations
  43. GRB 080520: VLT redshift
  44. GRB 080520, GROND observations
  45. GRB 080520: Enhanced Swift-XRT position
  46. GRB 080520: Swift XRT Refined Analysis
  47. GRB 080520: Swift detection of a burst with optical afterglow
  48. GRB 080514B: Suzaku WAM observation of the prompt emission
  49. Konus-Wind observation of GRB 080514B
  50. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  51. GRB 080503: Further HST imaging
  52. GRB 080517, Swift-BAT refined analysis
  53. GRB 080516, GROND further analysis
  54. GRB 080517: Swift-XRT refined analysis
  55. GRB 080514B: Further NIR observations
  56. GRB 080517: Enhanced Swift-XRT position
  57. GRB080517: Liverpool Telescope Optical Observations
  58. GRB 080517: Swift detection of a burst
  59. GRB 080516, GROND 2nd epoch observations
  60. GRB 080516, GROND observations
  61. GRB080430: optical observations
  62. GRB 080516, SMARTS optical/IR observations
  63. GRB 080516: Swift-XRT Team refined analysis
  64. GRB 080516, Swift-BAT refined analysis
  65. GRB 080516: Enhanced Swift-XRT position
  66. GRB 080514B: NOT observations
  67. GRB 080516: Swift detection of a burst
  68. Errartum: VLA upper limit on GRB 080507
  69. VLA upper limit on GRB 080705
  70. GRB 080514B : redshift estimation
  71. Konus-Wind observation of GRB 080513
  72. IPN triangulation of bright GRB 080513
  73. Swift-BAT refined analysis for Trigger 311603: Galactic source
  74. GRB 080515, Swift-BAT refined analysis
  75. GRB 080514B: KPNO 4m IR observations
  76. GRB 080514B: slow fading behaviour ?
  77. GRB 080514B: Swift-XRT analysis
  78. GRB 080514B, GROND observations
  79. GRB 080515: Swift detection of a burst
  80. GRB 080514B: Finding chart
  81. GRB 080514B: Afterglow candidate
  82. GRB 080514B: Watcher observations
  83. GRB 080430
  84. GRB 080514B: possible AGILE detection at E>50 MeV
  85. GRB 080514B: SuperAGILE/IPN GRB Localization
  86. procesure for GRB Circular
  87. Swift detection of a possible galactic transient
  88. GRB080514: REM NIR & Optical Observations
  89. Konus-Wind observation of GRB 080507
  90. GRB 080319B: Further HST observations and underlying host
  91. GRB 080506: NAYUTA Optical Observation
  92. GRB 080507: Suzaku WAM observation of the prompt emission
  93. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  94. GRB 080507: Keck photometry
  95. GRB 080507: E Pur Si Muove!
  96. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  97. GRB 080503: Hubble Space Telescope Imaging
  98. GRB080507: Swift/UVOT followup observations
  99. GRB 080507: Optical Afterglow
  100. GRB 080506:Optical observations from HCT

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