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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"

42591 results found.

  1. GRB 140213A: Swift detection of a burst
  2. GRB140211A : Xinglong TNT upper limit
  3. Trigger 586482: Swift detection of GROJ1744-28
  4. Correction to GCN 18521 "GRB140209A: Swift/UVOT observations"
  5. GRB 140211A: Swift-BAT refined analysis
  6. GRB 140209A: Swift-XRT observations
  7. Konus-Wind observation of GRB 140209A
  8. GRB 140211A: Swift detection of a burst
  9. GRB 140209A: Swift-BAT Spectral lag analysis
  10. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  11. GRB 140209A, Swift-BAT refined analysis
  12. GRB 140209A: Fermi GBM observation
  13. GRB 140209A: optical observations
  14. GRB 140209A: P60 optical afterglow detection
  15. GRB 140209A: Swift detection of a burst
  16. GRB 140206A: Mondy optical observations
  17. GRB 140206A: Liverpool Telescope optical afterglow observations
  18. GRB 140206A, Swift-BAT refined analysis
  19. Konus-Wind observation of GRB 140206B
  20. GRB 140206A: MITSuME Akeno detection of the optical counterpart
  21. GRB 140206A: TNG redshift confirmation
  22. GRB 140206A: Optical Observations via Virtual Telescope
  23. GRB 140206A: NOT redshift
  24. GRB 140206A: TNG optical observations
  25. GRB 140206A: Swift-XRT refined Analysis
  26. GRB 140206A: T100 observations
  27. GRB 140206A: Fermi GBM detection
  28. GRB 140206A: Swift/UVOT Detection
  29. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  30. GRB 140206A: Enhanced Swift-XRT position
  31. GRB 140206A: ISON-Ussuriysk optical observations
  32. GRB 140206B: Fermi-LAT detection
  33. GRB 140206B: Fermi GBM detection
  34. GRB 140206A: Nanshan optical observations
  35. GRB 140206A: MASTER OT detection
  36. GRB 140206A: Swift/UVOT optical detection
  37. GRB140206A - Optical afterglow candidate
  38. GRB140206A: a long GRB detected by INTEGRAL
  39. GRB 140206A: Swift detection of a burst
  40. GRB 140129A: 5 GHz VLA observations
  41. GRB 140129A: Continued RATIR Optical and NIR Observations
  42. GRB 140129A: Khureltogot optical limit
  43. GRB 140129B: Swift/UVOT Detection
  44. GRB 140129A: Continued RATIR Optical and NIR Observations
  45. GRB 140129B: Swift-XRT refined Analysis
  46. GRB 140129B: MASTER OT early light curve
  47. GRB 140129A: CARMA early observations
  48. GRB 140129B, Swift-BAT refined analysis (probably not a short burst)
  49. GRB 140129A: P200 spectroscopy
  50. GRB 140129B: Enhanced Swift-XRT position
  51. GRB 140129A, Swift-BAT refined analysis
  52. GRB 140129A: Swift/UVOT Observations
  53. GRB 140129A: Swift-XRT refined Analysis
  54. GRB 140129B: MASTER OT confirmation
  55. GRB 140129B: Swift detection of a burst with an optical afterglow
  56. GRB 140129A: Enhanced Swift-XRT position
  57. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  58. GRB 140129A: RATIR Optical and NIR Observations
  59. GRB 140129A: P60 optical afterglow detection
  60. GRB 140129A: Swift detection of a burst with an optical afterglow
  61. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  62. Fermi412093190: iPTF optical counterpart search
  63. GRB 140110A: Second Follow-up Swift-XRT Observation
  64. GRB 140114A: optical upper limit
  65. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  66. Konus-Wind observation of GRB 131215A
  67. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  68. GRB 140118A: RATIR Optical and NIR Observations
  69. GRB 140118A: Fermi GBM observation
  70. GRB 140118A, Swift-BAT refined analysis
  71. Swift Trigger 584155 is MAXI J1421-613
  72. GRB 140118A: Swift detection of a burst
  73. GRB 140110A: Further Swift-XRT Observation
  74. GRB 140103A: MASTER-Net early OT detection
  75. GRB 140103A: optical upper limit
  76. GRB 140108A: Mondy optical observations, refined analysis
  77. GRB 140114A: NOT afterglow observations
  78. GRB 140114A: Continued RATIR Optical and NIR Observations
  79. GRB 140114A: ROTSE-III Optical Limits
  80. GRB 140114A: Swift-XRT refined Analysis
  81. GRB 140114A: Swift-BAT refined analysis
  82. GRB 140114A: KAIT Optical Upper Limit
  83. GRB 140103A: AAO optical afterglow candidate
  84. GRB 140104B: Further Swift XRT observations
  85. GRB 140114A: Enhanced Swift-XRT position
  86. GRB 140114A: RATIR Optical and NIR Afterglow Detection
  87. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  88. GRB 140102A: AAO optical upper limits
  89. GRB 140114A: P60 Observations
  90. GRB 140114A: Swift detection of a burst
  91. GRB 140108A: Konkoly optical observations
  92. GRB 140110A: Swift/UVOT retraction of UVOT candidates
  93. IPN Triangulation of GRB 140110A
  94. GRB 140110A: Swift/UVOT Observations
  95. GRB 140108A: Suzaku WAM observation of the prompt emission
  96. GRB 140104B: Suzaku WAM observation of the prompt emission
  97. GRB 140110A: Swift XRT observations
  98. GRB 140110A: Reported UVOT OT not GRB afterglow
  99. GRB 140110A: OT detection in Swift/UVOT imaging
  100. GRB 140108A BAT refined analysis update *CORRECTION*

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