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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"

27415 results found.

  1. GRB 140215A: RATIR Optical and NIR Observations
  2. GRB140215A: Skynet PROMPT Optical Observations
  3. GRB140215A: Prompt Observations with Discovery Channel Telescope
  4. GRB 140215A: Swift detection of a burst with optical counterpart
  5. GRB 140213A: Swift-BAT refined analysis
  6. GRB140206A: Discovery Channel Telescope Optical Detection
  7. GRB 140213A: Swift/UVOT Observations
  8. GRB 140213A: Fermi GBM Detection
  9. GRB 140213A: Swift-XRT refined Analysis
  10. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  11. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  12. GRB 140213A: Swift-XRT observations
  13. GRB 140213A: Swift/UVOT Detection
  14. GRB 140213A: Swift detection of a burst
  15. GRB140211A : Xinglong TNT upper limit
  16. Trigger 586482: Swift detection of GROJ1744-28
  17. GRB140209A: Swift/UVOT observations.
  18. GRB 140211A: Swift-BAT refined analysis
  19. GRB 140209A: Swift-XRT observations
  20. Konus-Wind observation of GRB 140209A
  21. GRB 140211A: MITSuME Okayama upper limits
  22. GRB 140211A: Swift detection of a burst
  23. GRB 140209A: Early RAPTOR Optical Detection
  24. GRB 140209A: Swift-BAT Spectral lag analysis
  25. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  26. GRB 140209A, Swift-BAT refined analysis
  27. GRB 140209A: Fermi GBM observation
  28. GRB 140209A: optical observations
  29. GRB 140209A: P60 optical afterglow detection
  30. GRB 140209A: Swift detection of a burst
  31. GRB 140206A: Liverpool Telescope optical afterglow observations
  32. GRB 140206A, Swift-BAT refined analysis
  33. GRB 140206A: Swift-XRT refined Analysis
  34. GRB 140206A: T100 observations
  35. GRB 140206A: Fermi GBM detection
  36. GRB 140206A: Swift/UVOT Detection
  37. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  38. GRB 140206A: ISON-Ussuriysk optical observations
  39. GRB 140206B: Fermi-LAT detection
  40. GRB 140206B: Fermi GBM detection
  41. GRB 140206A: MASTER OT detection
  42. GRB 140206A: Swift/UVOT optical detection
  43. GRB 140206A: Swift detection of a burst
  44. GRB 140129A: Continued RATIR Optical and NIR Observations
  45. GRB 140129B: Swift/UVOT Detection
  46. GRB 140129A: Continued RATIR Optical and NIR Observations
  47. GRB 140129B: Swift-XRT refined Analysis
  48. GRB 140129B: MASTER OT early light curve
  49. GRB 140129A: CARMA early observations
  50. GRB 140129B, Swift-BAT refined analysis (probably not a short burst)
  51. GRB 140129A: P200 spectroscopy
  52. GRB140129A: RAPTOR Observations of the Early Afterglow
  53. GRB 140129A, Swift-BAT refined analysis
  54. GRB 140129A: Swift/UVOT Observations
  55. GRB 140129A: Swift-XRT refined Analysis
  56. GRB 140129B: MASTER OT confirmation
  57. GRB 140129B: Swift detection of a burst with an optical afterglow
  58. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  59. GRB 140129A: RATIR Optical and NIR Observations
  60. GRB 140129A: P60 optical afterglow detection
  61. GRB 140129A: Swift detection of a burst with an optical afterglow
  62. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  63. Fermi412093190: iPTF optical counterpart search
  64. GRB 140110A: Second Follow-up Swift-XRT Observation
  65. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  66. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  67. GRB 140118A: RATIR Optical and NIR Observations
  68. GRB 140118A: Fermi GBM observation
  69. GRB 140118A, Swift-BAT refined analysis
  70. Swift Trigger 584155 is MAXI J1421-613
  71. GRB 140118A: Swift detection of a burst
  72. GRB 140110A: Further Swift-XRT Observation
  73. GRB 140103A: MASTER-Net early OT detection
  74. GRB 140103A: optical upper limit
  75. GRB 140108A: Mondy optical observations, refined analysis
  76. GRB 140114A: Continued RATIR Optical and NIR Observations
  77. GRB 140114A: ROTSE-III Optical Limits
  78. GRB 140114A: Swift-XRT refined Analysis
  79. GRB 140114A: Swift-BAT refined analysis
  80. GRB 140114A: Swift/UVOT Upper Limits
  81. GRB 140104B: Further Swift XRT observations
  82. GRB 140114A: RATIR Optical and NIR Afterglow Detection
  83. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  84. GRB 140114A: P60 Observations
  85. GRB 140114A: Swift detection of a burst
  86. IPN Triangulation of GRB 140110A
  87. GRB 140110A: Swift/UVOT Observations
  88. GRB 140108A: Suzaku WAM observation of the prompt emission
  89. GRB 140110A: Swift XRT observations
  90. GRB 140108A BAT refined analysis update *CORRECTION*
  91. GRB 140108A BAT refined analysis update
  92. GRB 140110A: Fermi GBM observation
  93. GRB 140110A: Fermi-LAT detection of a burst
  94. GRB 140105A: MASTER-Net early optical observations and time correction
  95. GRB 140108A: Swift-BAT refined analysis
  96. GRB 140108A: Fermi GBM detection
  97. GRB 140108A: Swift/UVOT Detection
  98. GRB 140108A: theoretical prediction of redshift and of supernova occurrence
  99. GRB 140108A: Swift-XRT refined Analysis
  100. GRB 140108A: Mondy optical observations

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