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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"

32492 results found.

  1. GRB 080603A: Late-time Keck imaging and spectroscopy
  2. GRB 080603b: optical observation
  3. Swift observations of BAT Slew Survey event (Trigger=010)
  4. GRB 080603A: final Swift-XRT observations.
  5. GRB 080607: AGILE-MCAL observation of the prompt emission
  6. GRB 080603B - TLS 2nd Epoch: Another Break
  7. GRB 080605: TLS 3rd Epoch - Source Confusion
  8. GRB080605: optical observation with the MITSuME-OAO telescope
  9. Konus-Wind observation of GRB 080607
  10. GRB080607: RTT150 optical observations
  11. GRB 080603A: optical observations
  12. GRB 080607: Swift-XRT refined analysis
  13. Swift/UVOT Observations of GRB080607
  14. GRB 080605: optical observations
  15. GRB 080607 KAIT observations
  16. VLA detection of INTEGRAL burst GRB 080603A
  17. Konus-Wind observation of GRB 080605
  18. GRB 080607, Swift-BAT refined analysis
  19. GRB 080605: GROND 2nd epoch observations
  20. GRB 080607 - PAIRITEL NIR detection
  21. GRB 080607: Keck/LRIS spectroscopy and redshift
  22. GRB 080607: Super-LOTIS early observations
  23. GRB 080607: ROTSE-III Detection of Optical Counterpart
  24. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  25. GRB 080605: Swift-UVOT refined analysis
  26. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  27. GRB 080604: VLA radio upper limit
  28. GRB 080605, Swift-BAT refined analysis
  29. GRB 080603B: VLA radio upper limit
  30. GRB 080605, Swift-BAT refined analysis
  31. GRB 080605: Swift-XRT refined analysis
  32. GRB080605: observation by BOOTES
  33. GRB 080605: MASTER VWF 46 s AT observation
  34. GRB 080605: GROND detection of the optical afterglow candidate
  35. GRB080605: optical observations
  36. GRB 080605: VLT redshift
  37. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  38. GRB 080605: TLS RRM Afterglow
  39. GRB 080603B: PAIRITEL infrared detection
  40. GRB 080603A: PAIRITEL infrared detection
  41. GRB 080604: Xinglong R band observation
  42. GRB 080603A: Xinglong R band observation
  43. GRB 080603B: TLS Afterglow Observation
  44. GRB 080603A: TLS Afterglow Observation
  45. Swift/UVOT observations of GRB080604
  46. GRB080604: HET redshift retraction
  47. GRB 080604: Gemini-North spectroscopy
  48. GRB 080604, Swift-BAT refined analysis
  49. GRB 080604: Swift-XRT refined analysis
  50. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  51. GRB 080603B : Xinglong EST observations
  52. GRB 080603B : Liverpool Telescope Observations
  53. Konus-Wind observation of GRB 080603B
  54. GRB 080603B: Swift-XRT refined analysis
  55. GRB 080603A: Swift-XRT detection of the afterglow
  56. GRB 080430: optical observations
  57. GRB 080603B: Swift/UVOT detection of the afterglow
  58. GRB 080603B, Swift-BAT refined analysis
  59. GRB 080604: Hobby-Eberly Telescope spectroscopy
  60. GRB 080603A: Swift/UVOT detection of the afterglow
  61. GRB080603B: RTT150 optical observations, break in light curves
  62. GRB 080604: Early Super-LOTIS Observations
  63. GRB080604: confirmation of optical afterglow
  64. GRB080603B: NOT redshift
  65. GRB 080603B: BOOTES2/TELMA optical observations
  66. GRB080603: Super-LOTIS detection of Optical Counterpart
  67. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  68. GRB 080603: Gemini-North redshift
  69. GRB 080602, Swift-BAT refined analysis
  70. GRB 080602: Swift-XRT refined analysis
  71. Konus-Wind observation of GRB 080602
  72. GRB 080602: NOT R-band upper limit
  73. Swift analysis of BAT Slew Survey event (Trigger=009)
  74. GRB 080523: afterglow confirmation and redshift constraints
  75. Konus-Wind observation of reactivation of SGR 1627-41
  76. Reactivation of SGR 1627-41
  77. GRB 080524: Swift XRT and UVOT analysis
  78. GRB 080503: 2nd Epoch Chandra X-ray Observations
  79. GRB 080523: Swift-XRT refined analysis
  80. GRB 080523, Swift-BAT refined analysis
  81. GRB 080520: VLT host detection
  82. GRB 080523: VLT optical observations
  83. Swift/UVOT observations of GRB 080523
  84. GRB 080515: KPNO 4m NIR afterglow detection
  85. GRB 80516: Swift/UVOT Observations
  86. GRB 080515: Swift-XRT position and analysis
  87. GRB 080520, Swift-BAT refined analysis
  88. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  89. GRB 080514B: UVOT Observations
  90. GRB080520: Swift/UVOT observations
  91. GRB 080520: VLT redshift
  92. GRB 080520, GROND observations
  93. GRB 080520: Swift XRT Refined Analysis
  94. Konus-Wind observation of GRB 080514B
  95. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  96. GRB 080503: Further HST imaging
  97. GRB 080517, Swift-BAT refined analysis
  98. GRB 080516, GROND further analysis
  99. GRB 080517: Swift-XRT refined analysis
  100. GRB 080514B: Further NIR observations

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