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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. GRB 080603A: optical observations on June 04
  2. GRB 080613A: Swift-XRT detection of the afterglow
  3. GRB080613A: Swift/UVOT Upper Limits
  4. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  5. GRB 080613B: GROND Upper Limits
  6. GRB 080613B - NOT optical and IR nondetections
  7. GRB080613B: Swift/UVOT Upper Limits
  8. GRB 080613B, Swift-BAT refined analysis
  9. GRB 080613B: Swift-XRT refined analysis
  10. GRB 080514B: Spectroscopic constraints and probable host galaxy
  11. GRB 080613B: Swift detection of a burst
  12. GRB 080613: Faulkes Telescope North optical candidate
  13. GRB 080613 : a long GRB detected with INTEGRAL
  14. GRB 080603A: Late-time Keck imaging and spectroscopy
  15. GRB 080603b: optical observation
  16. Swift observations of BAT Slew Survey event (Trigger=010)
  17. GRB 080603A: final Swift-XRT observations.
  18. GRB 080607: AGILE-MCAL observation of the prompt emission
  19. GRB 080603B - TLS 2nd Epoch: Another Break
  20. GRB 080605: TLS 3rd Epoch - Source Confusion
  21. GRB080605: optical observation with the MITSuME-OAO telescope
  22. Konus-Wind observation of GRB 080607
  23. GRB080607: RTT150 optical observations
  24. GRB 080603A: optical observations
  25. GRB 080607: Swift-XRT refined analysis
  26. Swift/UVOT Observations of GRB080607
  27. GRB 080605: optical observations
  28. GRB 080607 KAIT observations
  29. VLA detection of INTEGRAL burst GRB 080603A
  30. Konus-Wind observation of GRB 080605
  31. GRB 080607: Enhanced Swift-XRT position
  32. GRB 080607, Swift-BAT refined analysis
  33. GRB 080605: GROND 2nd epoch observations
  34. GRB 080607 - PAIRITEL NIR detection
  35. GRB 080607: Keck/LRIS spectroscopy and redshift
  36. GRB 080607: Super-LOTIS early observations
  37. GRB 080607: Swift detection of a burst with optical afterglow
  38. GRB 080607: ROTSE-III Detection of Optical Counterpart
  39. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  40. GRB 080605: Swift-UVOT refined analysis
  41. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  42. GRB 080604: VLA radio upper limit
  43. GRB 080605, Swift-BAT refined analysis
  44. GRB 080603B: VLA radio upper limit
  45. GRB 080605, Swift-BAT refined analysis
  46. GRB 080605: Swift-XRT refined analysis
  47. GRB080605: observation by BOOTES
  48. GRB 080605: MASTER VWF 46 s AT observation
  49. GRB 080605: Enhanced Swift-XRT position
  50. GRB 080605: GROND detection of the optical afterglow candidate
  51. GRB080605: optical observations
  52. GRB 080605: VLT redshift
  53. GRB 080605: Liverpool Telescope optical afterglow candidate
  54. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  55. GRB 080605: TLS RRM Afterglow
  56. GRB 080605: Swift detection of a burst with an optical afterglow
  57. GRB 080603B: PAIRITEL infrared detection
  58. GRB 080603A: PAIRITEL infrared detection
  59. GRB 080604: Xinglong R band observation
  60. GRB 080603A: Xinglong R band observation
  61. GRB 080603B: TLS Afterglow Observation
  62. GRB 080603A: TLS Afterglow Observation
  63. GRB 080604: MITSuME Okayama observation
  64. Swift/UVOT observations of GRB080604
  65. GRB080604: HET redshift retraction
  66. GRB 080604: Gemini-North spectroscopy
  67. GRB 080604, Swift-BAT refined analysis
  68. GRB 080604: Swift-XRT refined analysis
  69. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  70. GRB 080603B : Xinglong EST observations
  71. GRB 080603B : Liverpool Telescope Observations
  72. Konus-Wind observation of GRB 080603B
  73. GRB 080603B: Swift-XRT refined analysis
  74. GRB 080603A: Swift-XRT detection of the afterglow
  75. GRB 080430: optical observations
  76. GRB 080603B: Swift/UVOT detection of the afterglow
  77. GRB 080604: Enhanced Swift-XRT position
  78. GRB 080603B, Swift-BAT refined analysis
  79. GRB 080604: Hobby-Eberly Telescope spectroscopy
  80. GRB 080603A: Swift/UVOT detection of the afterglow
  81. GRB080603B: RTT150 optical observations, break in light curves
  82. GRB 080604: Early Super-LOTIS Observations
  83. GRB080604: confirmation of optical afterglow
  84. GRB 080604: Swift detection of a burst with an optical afterglow
  85. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  86. GRB 080516: TAROT La Silla observatory optical observations
  87. GRB080603B: NOT redshift
  88. GRB 080603B: BOOTES2/TELMA optical observations
  89. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  90. GRB 080603B: Swift detection of a burst with optical afterglow
  91. GRB080603: Super-LOTIS detection of Optical Counterpart
  92. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  93. GRB 080603: Gemini-North redshift
  94. GRB 080603: A long GRB detected by INTEGRAL
  95. GRB 080603 OA candidate
  96. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  97. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  98. GRB 080602, Swift-BAT refined analysis
  99. GRB 080602: Swift-XRT refined analysis
  100. Konus-Wind observation of GRB 080602

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