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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"

27777 results found.

  1. GRB 080607 - PAIRITEL NIR detection
  2. GRB 080607: Swift detection of a burst with optical afterglow
  3. GRB 080607: ROTSE-III Detection of Optical Counterpart
  4. GRB 080605: Swift-UVOT refined analysis
  5. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  6. GRB 080604: VLA radio upper limit
  7. GRB 080605, Swift-BAT refined analysis
  8. GRB 080603B: VLA radio upper limit
  9. GRB 080605, Swift-BAT refined analysis
  10. GRB 080605: Swift-XRT refined analysis
  11. GRB 080605: MASTER VWF 46 s AT observation
  12. GRB 080605: Enhanced Swift-XRT position
  13. GRB 080605: GROND detection of the optical afterglow candidate
  14. GRB080605: optical observations
  15. GRB 080605: Liverpool Telescope optical afterglow candidate
  16. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  17. GRB 080605: TLS RRM Afterglow
  18. GRB 080605: Swift detection of a burst with an optical afterglow
  19. GRB 080603B: PAIRITEL infrared detection
  20. GRB 080603A: PAIRITEL infrared detection
  21. GRB 080603B: TLS Afterglow Observation
  22. Swift/UVOT observations of GRB080604
  23. GRB080604: HET redshift retraction
  24. GRB 080604, Swift-BAT refined analysis
  25. GRB 080604: Swift-XRT refined analysis
  26. GRB 080603B : Liverpool Telescope Observations
  27. Konus-Wind observation of GRB 080603B
  28. GRB 080603B: Swift-XRT refined analysis
  29. GRB 080603A: Swift-XRT detection of the afterglow
  30. GRB 080603B: Swift/UVOT detection of the afterglow
  31. GRB 080604: Enhanced Swift-XRT position
  32. GRB 080603B, Swift-BAT refined analysis
  33. GRB 080603A: Swift/UVOT detection of the afterglow
  34. GRB080603B: RTT150 optical observations, break in light curves
  35. GRB 080604: Early Super-LOTIS Observations
  36. GRB080604: confirmation of optical afterglow
  37. GRB 080604: Swift detection of a burst with an optical afterglow
  38. GRB 080516: TAROT La Silla observatory optical observations
  39. GRB080603B: NOT redshift
  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. GRB080603: Super-LOTIS detection of Optical Counterpart
  43. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  44. GRB 080603: Gemini-North redshift
  45. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  46. GRB 080602, Swift-BAT refined analysis
  47. GRB 080602: Swift-XRT refined analysis
  48. Konus-Wind observation of GRB 080602
  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. 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 080524: Swift-BAT detection of a burst in ground analysis
  56. GRB 080523: Swift-XRT refined analysis
  57. GRB 080523, Swift-BAT refined analysis
  58. GRB 080520: VLT host detection
  59. GRB 080523: VLT optical observations
  60. Swift/UVOT observations of GRB 080523
  61. GRB 080523: Enhanced Swift-XRT position
  62. GRB 080523: Swift detection of a burst
  63. GRB 080515: KPNO 4m NIR afterglow detection
  64. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  65. GRB 80516: Swift/UVOT Observations
  66. GRB 080515: Swift-XRT position and analysis
  67. GRB 080520, Swift-BAT refined analysis
  68. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  69. GRB 080514B: UVOT Observations
  70. GRB080520: Swift/UVOT observations
  71. GRB 080520, GROND observations
  72. GRB 080520: Enhanced Swift-XRT position
  73. GRB 080520: Swift XRT Refined Analysis
  74. GRB 080520: Swift detection of a burst with optical afterglow
  75. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  76. GRB 080517, Swift-BAT refined analysis
  77. GRB 080517: Swift-XRT refined analysis
  78. GRB 080517: Enhanced Swift-XRT position
  79. GRB 080517: Swift detection of a burst
  80. GRB 080516, SMARTS optical/IR observations
  81. GRB 080516: Swift-XRT Team refined analysis
  82. GRB 080516, Swift-BAT refined analysis
  83. GRB 080516: Enhanced Swift-XRT position
  84. GRB 080514B: NOT observations
  85. GRB 080516: Swift detection of a burst
  86. Errartum: VLA upper limit on GRB 080507
  87. VLA upper limit on GRB 080705
  88. IPN triangulation of bright GRB 080513
  89. Swift-BAT refined analysis for Trigger 311603: Galactic source
  90. GRB 080515, Swift-BAT refined analysis
  91. GRB 080514B: Swift-XRT analysis
  92. GRB 080515: Swift detection of a burst
  93. GRB 080514B: possible AGILE detection at E>50 MeV
  94. Swift detection of a possible galactic transient
  95. GRB 080507: Suzaku WAM observation of the prompt emission
  96. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  97. GRB 080507: Keck photometry
  98. GRB 080507: E Pur Si Muove!
  99. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  100. GRB 080503: Hubble Space Telescope Imaging

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