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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"
  1. Konus-Wind observation of GRB 080607
  2. GRB080607: RTT150 optical observations
  3. GRB 080603A: optical observations
  4. GRB 080607: Swift-XRT refined analysis
  5. Swift/UVOT Observations of GRB080607
  6. GRB 080605: optical observations
  7. GRB 080607 KAIT observations
  8. VLA detection of INTEGRAL burst GRB 080603A
  9. Konus-Wind observation of GRB 080605
  10. GRB 080607: Enhanced Swift-XRT position
  11. GRB 080607, Swift-BAT refined analysis
  12. GRB 080605: GROND 2nd epoch observations
  13. GRB 080607 - PAIRITEL NIR detection
  14. GRB 080607: Keck/LRIS spectroscopy and redshift
  15. GRB 080607: Super-LOTIS early observations
  16. GRB 080607: Swift detection of a burst with optical afterglow
  17. GRB 080607: ROTSE-III Detection of Optical Counterpart
  18. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  19. GRB 080605: Swift-UVOT refined analysis
  20. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  21. GRB 080604: VLA radio upper limit
  22. GRB 080605, Swift-BAT refined analysis
  23. GRB 080603B: VLA radio upper limit
  24. GRB 080605, Swift-BAT refined analysis
  25. GRB 080605: Swift-XRT refined analysis
  26. GRB080605: observation by BOOTES
  27. GRB 080605: MASTER VWF 46 s AT observation
  28. GRB 080605: Enhanced Swift-XRT position
  29. GRB 080605: GROND detection of the optical afterglow candidate
  30. GRB080605: optical observations
  31. GRB 080605: VLT redshift
  32. GRB 080605: Liverpool Telescope optical afterglow candidate
  33. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  34. GRB 080605: TLS RRM Afterglow
  35. GRB 080605: Swift detection of a burst with an optical afterglow
  36. GRB 080603B: PAIRITEL infrared detection
  37. GRB 080603A: PAIRITEL infrared detection
  38. GRB 080604: Xinglong R band observation
  39. GRB 080603A: Xinglong R band observation
  40. GRB 080603B: TLS Afterglow Observation
  41. GRB 080603A: TLS Afterglow Observation
  42. GRB 080604: MITSuME Okayama observation
  43. Swift/UVOT observations of GRB080604
  44. GRB080604: HET redshift retraction
  45. GRB 080604: Gemini-North spectroscopy
  46. GRB 080604, Swift-BAT refined analysis
  47. GRB 080604: Swift-XRT refined analysis
  48. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  49. GRB 080603B : Xinglong EST observations
  50. GRB 080603B : Liverpool Telescope Observations
  51. Konus-Wind observation of GRB 080603B
  52. GRB 080603B: Swift-XRT refined analysis
  53. GRB 080603A: Swift-XRT detection of the afterglow
  54. GRB 080430: optical observations
  55. GRB 080603B: Swift/UVOT detection of the afterglow
  56. GRB 080604: Enhanced Swift-XRT position
  57. GRB 080603B, Swift-BAT refined analysis
  58. GRB 080604: Hobby-Eberly Telescope spectroscopy
  59. GRB 080603A: Swift/UVOT detection of the afterglow
  60. GRB080603B: RTT150 optical observations, break in light curves
  61. GRB 080604: Early Super-LOTIS Observations
  62. GRB080604: confirmation of optical afterglow
  63. GRB 080604: Swift detection of a burst with an optical afterglow
  64. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  65. GRB 080516: TAROT La Silla observatory optical observations
  66. GRB080603B: NOT redshift
  67. GRB 080603B: BOOTES2/TELMA optical observations
  68. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  69. GRB 080603B: Swift detection of a burst with optical afterglow
  70. GRB080603: Super-LOTIS detection of Optical Counterpart
  71. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  72. GRB 080603: Gemini-North redshift
  73. GRB 080603: A long GRB detected by INTEGRAL
  74. GRB 080603 OA candidate
  75. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  76. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  77. GRB 080602, Swift-BAT refined analysis
  78. GRB 080602: Swift-XRT refined analysis
  79. Konus-Wind observation of GRB 080602
  80. GRB 080602: NOT R-band upper limit
  81. GRB 080602: Enhanced Swift-XRT position
  82. GRB 080602: Swift detection of a burst
  83. Swift analysis of BAT Slew Survey event (Trigger=009)
  84. GRB 080523: afterglow confirmation and redshift constraints
  85. Konus-Wind observation of reactivation of SGR 1627-41
  86. Reactivation of SGR 1627-41
  87. GRB 080524: Swift XRT and UVOT analysis
  88. GRB 080503: 2nd Epoch Chandra X-ray Observations
  89. GRB 080524: Swift-BAT detection of a burst in ground analysis
  90. GRB 080523: Swift-XRT refined analysis
  91. GRB 080523, Swift-BAT refined analysis
  92. GRB 080520: VLT host detection
  93. GRB 080523: VLT optical observations
  94. Swift/UVOT observations of GRB 080523
  95. GRB 080523: Enhanced Swift-XRT position
  96. GRB 080523: Swift detection of a burst
  97. GRB 080515: NIR magnitude correction
  98. GRB 080515: KPNO 4m NIR afterglow detection
  99. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  100. GRB 80516: Swift/UVOT Observations

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