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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"

19600 results found.

  1. GRB 070809: Putative host galaxy and redshift
  2. Konus-Wind observation of GRB 080613B
  3. GRB 080613A: Swift-XRT detection of the afterglow
  4. GRB080613A: Swift/UVOT Upper Limits
  5. GRB 080613B: GROND Upper Limits
  6. GRB080613B: Swift/UVOT Upper Limits
  7. GRB 080613B, Swift-BAT refined analysis
  8. GRB 080613B: Swift-XRT refined analysis
  9. GRB 080613B: Swift detection of a burst
  10. GRB 080603b: optical observation
  11. Swift observations of BAT Slew Survey event (Trigger=010)
  12. GRB 080603A: final Swift-XRT observations.
  13. GRB 080607: AGILE-MCAL observation of the prompt emission
  14. GRB 080603B - TLS 2nd Epoch: Another Break
  15. GRB 080605: TLS 3rd Epoch - Source Confusion
  16. Konus-Wind observation of GRB 080607
  17. GRB080607: RTT150 optical observations
  18. GRB 080607: Swift-XRT refined analysis
  19. Swift/UVOT Observations of GRB080607
  20. GRB 080605: optical observations
  21. GRB 080607 KAIT observations
  22. Konus-Wind observation of GRB 080605
  23. GRB 080607: Enhanced Swift-XRT position
  24. GRB 080607, Swift-BAT refined analysis
  25. GRB 080605: GROND 2nd epoch observations
  26. GRB 080607: Swift detection of a burst with optical afterglow
  27. GRB 080607: ROTSE-III Detection of Optical Counterpart
  28. GRB 080605: Swift-UVOT refined analysis
  29. GRB 080604: VLA radio upper limit
  30. GRB 080605, Swift-BAT refined analysis
  31. GRB 080603B: VLA radio upper limit
  32. GRB 080605, Swift-BAT refined analysis
  33. GRB 080605: Swift-XRT refined analysis
  34. GRB 080605: MASTER VWF 46 s AT observation
  35. GRB 080605: Enhanced Swift-XRT position
  36. GRB 080605: GROND detection of the optical afterglow candidate
  37. GRB080605: optical observations
  38. GRB 080605: Liverpool Telescope optical afterglow candidate
  39. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  40. GRB 080605: TLS RRM Afterglow
  41. GRB 080605: Swift detection of a burst with an optical afterglow
  42. GRB 080603B: TLS Afterglow Observation
  43. Swift/UVOT observations of GRB080604
  44. GRB 080604, Swift-BAT refined analysis
  45. GRB 080604: Swift-XRT refined analysis
  46. GRB 080603B : Liverpool Telescope Observations
  47. Konus-Wind observation of GRB 080603B
  48. GRB 080603B: Swift-XRT refined analysis
  49. GRB 080603A: Swift-XRT detection of the afterglow
  50. GRB 080603B: Swift/UVOT detection of the afterglow
  51. GRB 080604: Enhanced Swift-XRT position
  52. GRB 080603B, Swift-BAT refined analysis
  53. GRB 080603A: Swift/UVOT detection of the afterglow
  54. GRB080603B: RTT150 optical observations, break in light curves
  55. GRB 080604: Early Super-LOTIS Observations
  56. GRB 080604: Swift detection of a burst with an optical afterglow
  57. GRB 080516: TAROT La Silla observatory optical observations
  58. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  59. GRB 080603B: Swift detection of a burst with optical afterglow
  60. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  61. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  62. GRB 080602, Swift-BAT refined analysis
  63. GRB 080602: Swift-XRT refined analysis
  64. Konus-Wind observation of GRB 080602
  65. GRB 080602: Enhanced Swift-XRT position
  66. GRB 080602: Swift detection of a burst
  67. Swift analysis of BAT Slew Survey event (Trigger=009)
  68. Konus-Wind observation of reactivation of SGR 1627-41
  69. Reactivation of SGR 1627-41
  70. GRB 080524: Swift XRT and UVOT analysis
  71. GRB 080524: Swift-BAT detection of a burst in ground analysis
  72. GRB 080523: Swift-XRT refined analysis
  73. GRB 080523, Swift-BAT refined analysis
  74. Swift/UVOT observations of GRB 080523
  75. GRB 080523: Enhanced Swift-XRT position
  76. GRB 080523: Swift detection of a burst
  77. GRB 80516: Swift/UVOT Observations
  78. GRB 080515: Swift-XRT position and analysis
  79. GRB 080520, Swift-BAT refined analysis
  80. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  81. GRB 080514B: UVOT Observations
  82. GRB080520: Swift/UVOT observations
  83. GRB 080520, GROND observations
  84. GRB 080520: Enhanced Swift-XRT position
  85. GRB 080520: Swift XRT Refined Analysis
  86. GRB 080520: Swift detection of a burst with optical afterglow
  87. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  88. GRB 080517, Swift-BAT refined analysis
  89. GRB 080517: Swift-XRT refined analysis
  90. GRB 080517: Enhanced Swift-XRT position
  91. GRB 080517: Swift detection of a burst
  92. GRB 080516, SMARTS optical/IR observations
  93. GRB 080516: Swift-XRT Team refined analysis
  94. GRB 080516, Swift-BAT refined analysis
  95. GRB 080516: Enhanced Swift-XRT position
  96. GRB 080516: Swift detection of a burst
  97. Errartum: VLA upper limit on GRB 080507
  98. VLA upper limit on GRB 080705
  99. IPN triangulation of bright GRB 080513
  100. Swift-BAT refined analysis for Trigger 311603: Galactic source

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