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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 140221A Tiled Swift observations
  2. GRB 140221A: MAXI/GSC detection
  3. GRB 140219A: Fermi-LAT detection of a burst
  4. GRB 140219A: Fermi GBM Detection
  5. GRB 140219A Tiled Swift observations
  6. IPN Triangulation of extremely bright long GRB 140219A
  7. Swift follow-up of an Integral weak transient
  8. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  9. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  10. Fermi GBM trigger 140214230 is not a GRB
  11. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  12. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  13. GRB 140215A: WSRT radio observation
  14. GRB 140211A: Khureltogot optical upper limits
  15. GRB 140215A: Continued RATIR Optical and NIR Observations
  16. Konus-Wind observation of GRB 140213A
  17. Konus-Wind observation of GRB 140215A
  18. GRB 140215A: Swift/UVOT Detection
  19. GRB 140211A: Swift-XRT and UVOT observations
  20. GRB140215A: Continued Discovery Channel Telescope Observations
  21. GRB 140215A: Continued RATIR Optical and NIR Observations
  22. GRB 140215A: MITSuME Okayama Optical Observation
  23. GRB 140215A: Swift-BAT refined analysis
  24. GRB 140215A: ISON-NM optical observations
  25. GRB 140215A: Swift-XRT refined Analysis
  26. GRB 140215A: P60 observations
  27. GRB 140215A: T24 optical observations
  28. GRB 140215A: Enhanced Swift-XRT position
  29. GRB 140215A: RATIR Optical and NIR Observations
  30. GRB140215A: Skynet PROMPT Optical Observations
  31. GRB 140215A: KAIT Optical Detection
  32. GRB140215A: Prompt Observations with Discovery Channel Telescope
  33. GRB 140215A: Swift detection of a burst with optical counterpart
  34. GRB 140213A: Swift-BAT refined analysis
  35. GRB140206A: Discovery Channel Telescope Optical Detection
  36. GRB 140213A: Swift/UVOT Observations
  37. GRB 140213A: Fermi GBM Detection
  38. GRB 140213A: Swift-XRT refined Analysis
  39. GRB140213A: VLT/X-shooter redshift
  40. GRB 140213A: Enhanced Swift-XRT position
  41. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  42. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  43. GRB 140213A: Swift-XRT observations
  44. GRB 140213A: Swift/UVOT Detection
  45. GRB 140213A: Swift detection of a burst
  46. GRB140211A : Xinglong TNT upper limit
  47. Trigger 586482: Swift detection of GROJ1744-28
  48. Correction to GCN 18521 "GRB140209A: Swift/UVOT observations"
  49. GRB140209A: Swift/UVOT observations.
  50. GRB 140211A: Swift-BAT refined analysis
  51. GRB 140209A: Swift-XRT observations
  52. Konus-Wind observation of GRB 140209A
  53. GRB 140211A: MITSuME Okayama upper limits
  54. GRB 140211A: Swift detection of a burst
  55. GRB 140209A: Early RAPTOR Optical Detection
  56. GRB 140209A: Swift-BAT Spectral lag analysis
  57. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  58. GRB 140209A, Swift-BAT refined analysis
  59. GRB 140209A: Fermi GBM observation
  60. GRB 140209A: optical observations
  61. GRB 140209A: P60 optical afterglow detection
  62. GRB 140209A: Swift detection of a burst
  63. GRB 140206A: Mondy optical observations
  64. GRB 140206A: Liverpool Telescope optical afterglow observations
  65. GRB 140206A, Swift-BAT refined analysis
  66. Konus-Wind observation of GRB 140206B
  67. GRB 140206A: MITSuME Akeno detection of the optical counterpart
  68. GRB 140206A: TNG redshift confirmation
  69. GRB 140206A: Optical Observations via Virtual Telescope
  70. GRB 140206A: NOT redshift
  71. GRB 140206A: TNG optical observations
  72. GRB 140206A: Swift-XRT refined Analysis
  73. GRB 140206A: T100 observations
  74. GRB 140206A: Fermi GBM detection
  75. GRB 140206A: Swift/UVOT Detection
  76. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  77. GRB 140206A: Enhanced Swift-XRT position
  78. GRB 140206A: ISON-Ussuriysk optical observations
  79. GRB 140206B: Fermi-LAT detection
  80. GRB 140206B: Fermi GBM detection
  81. GRB 140206A: Nanshan optical observations
  82. GRB 140206A: MASTER OT detection
  83. GRB 140206A: Swift/UVOT optical detection
  84. GRB140206A - Optical afterglow candidate
  85. GRB140206A: a long GRB detected by INTEGRAL
  86. GRB 140206A: Swift detection of a burst
  87. GRB 140129A: 5 GHz VLA observations
  88. GRB 140129A: Continued RATIR Optical and NIR Observations
  89. GRB 140129A: Khureltogot optical limit
  90. GRB 140129B: Swift/UVOT Detection
  91. GRB 140129A: Continued RATIR Optical and NIR Observations
  92. GRB 140102A: MITSuME Akeno Optical observation
  93. GRB 140129B: Swift-XRT refined Analysis
  94. GRB 140129B: MASTER OT early light curve
  95. GRB 140129A: CARMA early observations
  96. GRB 140129B, Swift-BAT refined analysis (probably not a short burst)
  97. GRB 140129A: P200 spectroscopy
  98. GRB140129A: RAPTOR Observations of the Early Afterglow
  99. GRB 140129A: MITSuME Okayama upper limits
  100. GRB 140129B: Enhanced Swift-XRT position

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