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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"

32495 results found.

  1. GRB 080613B: Swift-XRT refined analysis
  2. GRB 080514B: Spectroscopic constraints and probable host galaxy
  3. GRB 080613: Faulkes Telescope North optical candidate
  4. GRB 080603A: Late-time Keck imaging and spectroscopy
  5. GRB 080603b: optical observation
  6. Swift observations of BAT Slew Survey event (Trigger=010)
  7. GRB 080603A: final Swift-XRT observations.
  8. GRB 080607: AGILE-MCAL observation of the prompt emission
  9. GRB 080603B - TLS 2nd Epoch: Another Break
  10. GRB 080605: TLS 3rd Epoch - Source Confusion
  11. GRB080605: optical observation with the MITSuME-OAO telescope
  12. Konus-Wind observation of GRB 080607
  13. GRB080607: RTT150 optical observations
  14. GRB 080603A: optical observations
  15. GRB 080607: Swift-XRT refined analysis
  16. Swift/UVOT Observations of GRB080607
  17. GRB 080605: optical observations
  18. GRB 080607 KAIT observations
  19. VLA detection of INTEGRAL burst GRB 080603A
  20. Konus-Wind observation of GRB 080605
  21. GRB 080607, Swift-BAT refined analysis
  22. GRB 080605: GROND 2nd epoch observations
  23. GRB 080607 - PAIRITEL NIR detection
  24. GRB 080607: Keck/LRIS spectroscopy and redshift
  25. GRB 080607: Super-LOTIS early observations
  26. GRB 080607: ROTSE-III Detection of Optical Counterpart
  27. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  28. GRB 080605: Swift-UVOT refined analysis
  29. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  30. GRB 080604: VLA radio upper limit
  31. GRB 080605, Swift-BAT refined analysis
  32. GRB 080603B: VLA radio upper limit
  33. GRB 080605, Swift-BAT refined analysis
  34. GRB 080605: Swift-XRT refined analysis
  35. GRB080605: observation by BOOTES
  36. GRB 080605: MASTER VWF 46 s AT observation
  37. GRB 080605: GROND detection of the optical afterglow candidate
  38. GRB080605: optical observations
  39. GRB 080605: VLT redshift
  40. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  41. GRB 080605: TLS RRM Afterglow
  42. GRB 080603B: PAIRITEL infrared detection
  43. GRB 080603A: PAIRITEL infrared detection
  44. GRB 080604: Xinglong R band observation
  45. GRB 080603A: Xinglong R band observation
  46. GRB 080603B: TLS Afterglow Observation
  47. GRB 080603A: TLS Afterglow Observation
  48. Swift/UVOT observations of GRB080604
  49. GRB080604: HET redshift retraction
  50. GRB 080604: Gemini-North spectroscopy
  51. GRB 080604, Swift-BAT refined analysis
  52. GRB 080604: Swift-XRT refined analysis
  53. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  54. GRB 080603B : Xinglong EST observations
  55. GRB 080603B : Liverpool Telescope Observations
  56. Konus-Wind observation of GRB 080603B
  57. GRB 080603B: Swift-XRT refined analysis
  58. GRB 080603A: Swift-XRT detection of the afterglow
  59. GRB 080430: optical observations
  60. GRB 080603B: Swift/UVOT detection of the afterglow
  61. GRB 080603B, Swift-BAT refined analysis
  62. GRB 080604: Hobby-Eberly Telescope spectroscopy
  63. GRB 080603A: Swift/UVOT detection of the afterglow
  64. GRB080603B: RTT150 optical observations, break in light curves
  65. GRB 080604: Early Super-LOTIS Observations
  66. GRB080604: confirmation of optical afterglow
  67. GRB080603B: NOT redshift
  68. GRB 080603B: BOOTES2/TELMA optical observations
  69. GRB080603: Super-LOTIS detection of Optical Counterpart
  70. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  71. GRB 080603: Gemini-North redshift
  72. GRB 080602, Swift-BAT refined analysis
  73. GRB 080602: Swift-XRT refined analysis
  74. Konus-Wind observation of GRB 080602
  75. GRB 080602: NOT R-band upper limit
  76. Swift analysis of BAT Slew Survey event (Trigger=009)
  77. GRB 080523: afterglow confirmation and redshift constraints
  78. Konus-Wind observation of reactivation of SGR 1627-41
  79. Reactivation of SGR 1627-41
  80. GRB 080524: Swift XRT and UVOT analysis
  81. GRB 080503: 2nd Epoch Chandra X-ray Observations
  82. GRB 080523: Swift-XRT refined analysis
  83. GRB 080523, Swift-BAT refined analysis
  84. GRB 080520: VLT host detection
  85. GRB 080523: VLT optical observations
  86. Swift/UVOT observations of GRB 080523
  87. GRB 080515: KPNO 4m NIR afterglow detection
  88. GRB 80516: Swift/UVOT Observations
  89. GRB 080515: Swift-XRT position and analysis
  90. GRB 080520, Swift-BAT refined analysis
  91. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  92. GRB 080514B: UVOT Observations
  93. GRB080520: Swift/UVOT observations
  94. GRB 080520: VLT redshift
  95. GRB 080520, GROND observations
  96. GRB 080520: Swift XRT Refined Analysis
  97. Konus-Wind observation of GRB 080514B
  98. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  99. GRB 080503: Further HST imaging
  100. GRB 080517, Swift-BAT refined analysis

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