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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 140215A: Enhanced Swift-XRT position
  2. GRB 140215A: RATIR Optical and NIR Observations
  3. GRB140215A: Skynet PROMPT Optical Observations
  4. GRB 140215A: KAIT Optical Detection
  5. GRB140215A: Prompt Observations with Discovery Channel Telescope
  6. GRB 140215A: Swift detection of a burst with optical counterpart
  7. GRB 140213A: Swift-BAT refined analysis
  8. GRB140206A: Discovery Channel Telescope Optical Detection
  9. GRB 140213A: Swift/UVOT Observations
  10. GRB 140213A: Fermi GBM Detection
  11. GRB 140213A: Swift-XRT refined Analysis
  12. GRB140213A: VLT/X-shooter redshift
  13. GRB 140213A: Enhanced Swift-XRT position
  14. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  15. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  16. GRB 140213A: Swift-XRT observations
  17. GRB 140213A: Swift/UVOT Detection
  18. GRB 140213A: Swift detection of a burst
  19. GRB140211A : Xinglong TNT upper limit
  20. Trigger 586482: Swift detection of GROJ1744-28
  21. Correction to GCN 18521 "GRB140209A: Swift/UVOT observations"
  22. GRB140209A: Swift/UVOT observations.
  23. GRB 140211A: Swift-BAT refined analysis
  24. GRB 140209A: Swift-XRT observations
  25. Konus-Wind observation of GRB 140209A
  26. GRB 140211A: MITSuME Okayama upper limits
  27. GRB 140211A: Swift detection of a burst
  28. GRB 140209A: Early RAPTOR Optical Detection
  29. GRB 140209A: Swift-BAT Spectral lag analysis
  30. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  31. GRB 140209A, Swift-BAT refined analysis
  32. GRB 140209A: Fermi GBM observation
  33. GRB 140209A: optical observations
  34. GRB 140209A: P60 optical afterglow detection
  35. GRB 140209A: Swift detection of a burst
  36. GRB 140206A: Mondy optical observations
  37. GRB 140206A: Liverpool Telescope optical afterglow observations
  38. GRB 140206A, Swift-BAT refined analysis
  39. Konus-Wind observation of GRB 140206B
  40. GRB 140206A: MITSuME Akeno detection of the optical counterpart
  41. GRB 140206A: TNG redshift confirmation
  42. GRB 140206A: Optical Observations via Virtual Telescope
  43. GRB 140206A: NOT redshift
  44. GRB 140206A: TNG optical observations
  45. GRB 140206A: Swift-XRT refined Analysis
  46. GRB 140206A: T100 observations
  47. GRB 140206A: Fermi GBM detection
  48. GRB 140206A: Swift/UVOT Detection
  49. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  50. GRB 140206A: Enhanced Swift-XRT position
  51. GRB 140206A: ISON-Ussuriysk optical observations
  52. GRB 140206B: Fermi-LAT detection
  53. GRB 140206B: Fermi GBM detection
  54. GRB 140206A: Nanshan optical observations
  55. GRB 140206A: MASTER OT detection
  56. GRB 140206A: Swift/UVOT optical detection
  57. GRB140206A - Optical afterglow candidate
  58. GRB140206A: a long GRB detected by INTEGRAL
  59. GRB 140206A: Swift detection of a burst
  60. GRB 140129A: 5 GHz VLA observations
  61. GRB 140129A: Continued RATIR Optical and NIR Observations
  62. GRB 140129A: Khureltogot optical limit
  63. GRB 140129B: Swift/UVOT Detection
  64. GRB 140129A: Continued RATIR Optical and NIR Observations
  65. GRB 140102A: MITSuME Akeno Optical observation
  66. GRB 140129B: Swift-XRT refined Analysis
  67. GRB 140129B: MASTER OT early light curve
  68. GRB 140129A: CARMA early observations
  69. GRB 140129B, Swift-BAT refined analysis (probably not a short burst)
  70. GRB 140129A: P200 spectroscopy
  71. GRB140129A: RAPTOR Observations of the Early Afterglow
  72. GRB 140129A: MITSuME Okayama upper limits
  73. GRB 140129B: Enhanced Swift-XRT position
  74. GRB 140129A, Swift-BAT refined analysis
  75. GRB 140129A: Swift/UVOT Observations
  76. GRB 140129A: Swift-XRT refined Analysis
  77. GRB 140129B: MASTER OT confirmation
  78. GRB 140129B: Swift detection of a burst with an optical afterglow
  79. GRB 140129A: Enhanced Swift-XRT position
  80. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  81. GRB 140129A: RATIR Optical and NIR Observations
  82. GRB 140129A: P60 optical afterglow detection
  83. GRB 140129A: Swift detection of a burst with an optical afterglow
  84. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  85. Fermi412093190: iPTF optical counterpart search
  86. GRB 140110A: Second Follow-up Swift-XRT Observation
  87. GRB 140114A: optical upper limit
  88. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  89. Konus-Wind observation of GRB 131215A
  90. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  91. GRB 140118A: RATIR Optical and NIR Observations
  92. GRB 140118A: Fermi GBM observation
  93. GRB 140118A, Swift-BAT refined analysis
  94. Swift Trigger 584155 is MAXI J1421-613
  95. GRB 140118A: Swift detection of a burst
  96. GRB 140110A: Further Swift-XRT Observation
  97. GRB 140103A: MASTER-Net early OT detection
  98. GRB 140103A: optical upper limit
  99. GRB 140108A: Mondy optical observations, refined analysis
  100. GRB 140114A: NOT afterglow observations

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