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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"

19588 results found.

  1. Swift observations of BAT Slew Survey event (Trigger=010)
  2. GRB 080603A: final Swift-XRT observations.
  3. GRB 080607: AGILE-MCAL observation of the prompt emission
  4. GRB 080603B - TLS 2nd Epoch: Another Break
  5. GRB 080605: TLS 3rd Epoch - Source Confusion
  6. Konus-Wind observation of GRB 080607
  7. GRB080607: RTT150 optical observations
  8. GRB 080607: Swift-XRT refined analysis
  9. Swift/UVOT Observations of GRB080607
  10. GRB 080605: optical observations
  11. GRB 080607 KAIT observations
  12. Konus-Wind observation of GRB 080605
  13. GRB 080607: Enhanced Swift-XRT position
  14. GRB 080607, Swift-BAT refined analysis
  15. GRB 080605: GROND 2nd epoch observations
  16. GRB 080607: Swift detection of a burst with optical afterglow
  17. GRB 080607: ROTSE-III Detection of Optical Counterpart
  18. GRB 080605: Swift-UVOT refined analysis
  19. GRB 080604: VLA radio upper limit
  20. GRB 080605, Swift-BAT refined analysis
  21. GRB 080603B: VLA radio upper limit
  22. GRB 080605, Swift-BAT refined analysis
  23. GRB 080605: Swift-XRT refined analysis
  24. GRB 080605: MASTER VWF 46 s AT observation
  25. GRB 080605: Enhanced Swift-XRT position
  26. GRB 080605: GROND detection of the optical afterglow candidate
  27. GRB080605: optical observations
  28. GRB 080605: Liverpool Telescope optical afterglow candidate
  29. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  30. GRB 080605: TLS RRM Afterglow
  31. GRB 080605: Swift detection of a burst with an optical afterglow
  32. GRB 080603B: TLS Afterglow Observation
  33. Swift/UVOT observations of GRB080604
  34. GRB 080604, Swift-BAT refined analysis
  35. GRB 080604: Swift-XRT refined analysis
  36. GRB 080603B : Liverpool Telescope Observations
  37. Konus-Wind observation of GRB 080603B
  38. GRB 080603B: Swift-XRT refined analysis
  39. GRB 080603A: Swift-XRT detection of the afterglow
  40. GRB 080603B: Swift/UVOT detection of the afterglow
  41. GRB 080604: Enhanced Swift-XRT position
  42. GRB 080603B, Swift-BAT refined analysis
  43. GRB 080603A: Swift/UVOT detection of the afterglow
  44. GRB080603B: RTT150 optical observations, break in light curves
  45. GRB 080604: Early Super-LOTIS Observations
  46. GRB 080604: Swift detection of a burst with an optical afterglow
  47. GRB 080516: TAROT La Silla observatory optical observations
  48. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  49. GRB 080603B: Swift detection of a burst with optical afterglow
  50. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  51. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  52. GRB 080602, Swift-BAT refined analysis
  53. GRB 080602: Swift-XRT refined analysis
  54. Konus-Wind observation of GRB 080602
  55. GRB 080602: Enhanced Swift-XRT position
  56. GRB 080602: Swift detection of a burst
  57. Swift analysis of BAT Slew Survey event (Trigger=009)
  58. Konus-Wind observation of reactivation of SGR 1627-41
  59. Reactivation of SGR 1627-41
  60. GRB 080524: Swift XRT and UVOT analysis
  61. GRB 080524: Swift-BAT detection of a burst in ground analysis
  62. GRB 080523: Swift-XRT refined analysis
  63. GRB 080523, Swift-BAT refined analysis
  64. Swift/UVOT observations of GRB 080523
  65. GRB 080523: Enhanced Swift-XRT position
  66. GRB 080523: Swift detection of a burst
  67. GRB 80516: Swift/UVOT Observations
  68. GRB 080515: Swift-XRT position and analysis
  69. GRB 080520, Swift-BAT refined analysis
  70. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  71. GRB 080514B: UVOT Observations
  72. GRB080520: Swift/UVOT observations
  73. GRB 080520, GROND observations
  74. GRB 080520: Enhanced Swift-XRT position
  75. GRB 080520: Swift XRT Refined Analysis
  76. GRB 080520: Swift detection of a burst with optical afterglow
  77. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  78. GRB 080517, Swift-BAT refined analysis
  79. GRB 080517: Swift-XRT refined analysis
  80. GRB 080517: Enhanced Swift-XRT position
  81. GRB 080517: Swift detection of a burst
  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. IPN triangulation of bright GRB 080513
  90. Swift-BAT refined analysis for Trigger 311603: Galactic source
  91. GRB 080515, Swift-BAT refined analysis
  92. GRB 080514B: Swift-XRT analysis
  93. GRB 080515: Swift detection of a burst
  94. GRB 080514B: possible AGILE detection at E>50 MeV
  95. Swift detection of a possible galactic transient
  96. GRB 080507: Suzaku WAM observation of the prompt emission
  97. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  98. GRB 080507: Keck photometry
  99. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  100. GRB080507: Swift/UVOT followup observations

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