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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"

28048 results found.

  1. GRB 140301A: VLT/X-shooter redshift
  2. GRB 140301A: NOT afterglow candidate
  3. GRB 140301A: Enhanced Swift-XRT position
  4. GRB 140301A: Skynet R-COP Observations
  5. GRB 140301A: Swift detection of a burst
  6. GRB 140226A/iPTF14yb: 1.23m CAHA observations
  7. GRB 140226A/iPTF14yb: Mondy optical observations
  8. GRB 140226A/iPTF14yb: RATIR Optical and NIR Observations
  9. GRB 140219A: Mondy optical observations of XRT source #5
  10. Konus-Wind observation of GRB 140226A
  11. PTF14yb: GROND Transient Detection
  12. iPTF14yb: RATIR Optical and NIR Observations of the optical transient
  13. GRB 140219A: Suzaku WAM observation of the prompt emission
  14. iPTF14yb: Swift-XRT detection
  15. iPTF14yb: iPTF Discovery of an Optical Afterglow-like Transient
  16. GRB 140219A: MAXI/GSC detection
  17. GRB 140219A: MASTER optical brightening inside XRT-5 error box detection
  18. GRB 140219A: iPTF optical observations
  19. GRB 140102A: TAOS early optical afterglow detection
  20. GRB 140219A: optical observations of XRT source #5
  21. GRB 140221A: Results from Swift XRT tiled observations
  22. GRB 140219A: Xuyi and Nanshan upper limits
  23. GRB 140219A: results from Swift XRT and UVOT tiled observations
  24. GRB 140219A: MASTER before and after GRB observational arguments of the exceptionally Dark GRB
  25. GRB 140221A: MAXI/GSC detection
  26. GRB 140219A: Fermi-LAT detection of a burst
  27. IPN Triangulation of extremely bright long GRB 140219A
  28. Swift follow-up of an Integral weak transient
  29. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  30. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  31. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  32. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  33. GRB 140211A: Khureltogot optical upper limits
  34. GRB 140215A: Continued RATIR Optical and NIR Observations
  35. Konus-Wind observation of GRB 140213A
  36. GRB 140215A: Swift/UVOT Detection
  37. GRB 140215A: Continued RATIR Optical and NIR Observations
  38. GRB 140215A: MITSuME Okayama Optical Observation
  39. GRB 140215A: Swift-BAT refined analysis
  40. GRB 140215A: ISON-NM optical observations
  41. GRB 140215A: Swift-XRT refined Analysis
  42. GRB 140215A: Enhanced Swift-XRT position
  43. GRB 140215A: RATIR Optical and NIR Observations
  44. GRB 140215A: Swift detection of a burst with optical counterpart
  45. GRB 140213A: Swift-BAT refined analysis
  46. GRB140206A: Discovery Channel Telescope Optical Detection
  47. GRB 140213A: Swift-XRT refined Analysis
  48. GRB 140213A: Enhanced Swift-XRT position
  49. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  50. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  51. GRB 140213A: Swift-XRT observations
  52. GRB 140213A: Swift/UVOT Detection
  53. GRB 140213A: Swift detection of a burst
  54. Trigger 586482: Swift detection of GROJ1744-28
  55. GRB 140211A: Swift-BAT refined analysis
  56. GRB 140209A: Swift-XRT observations
  57. Konus-Wind observation of GRB 140209A
  58. GRB 140211A: MITSuME Okayama upper limits
  59. GRB 140211A: Swift detection of a burst
  60. GRB 140209A: Early RAPTOR Optical Detection
  61. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  62. GRB 140209A, Swift-BAT refined analysis
  63. GRB 140209A: optical observations
  64. GRB 140206A, Swift-BAT refined analysis
  65. GRB 140206A: MITSuME Akeno detection of the optical counterpart
  66. GRB 140206A: TNG redshift confirmation
  67. GRB 140206A: Optical Observations via Virtual Telescope
  68. GRB 140206A: NOT redshift
  69. GRB 140206A: TNG optical observations
  70. GRB 140206A: Swift-XRT refined Analysis
  71. GRB 140206A: T100 observations
  72. GRB 140206A: Fermi GBM detection
  73. GRB 140206A: Swift/UVOT Detection
  74. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  75. GRB 140206A: Enhanced Swift-XRT position
  76. GRB 140206A: ISON-Ussuriysk optical observations
  77. GRB 140206B: Fermi-LAT detection
  78. GRB 140206B: Fermi GBM detection
  79. GRB 140206A: Nanshan optical observations
  80. GRB 140206A: Swift/UVOT optical detection
  81. GRB 140206A: Swift detection of a burst
  82. GRB 140129A: 5 GHz VLA observations
  83. GRB 140129A: Continued RATIR Optical and NIR Observations
  84. GRB 140129A: Khureltogot optical limit
  85. GRB 140129B: Swift/UVOT Detection
  86. GRB 140129A: Continued RATIR Optical and NIR Observations
  87. GRB 140102A: MITSuME Akeno Optical observation
  88. GRB 140129B: Swift-XRT refined Analysis
  89. GRB 140129B: MASTER OT early light curve
  90. GRB 140129B, Swift-BAT refined analysis (probably not a short burst)
  91. GRB140129A: RAPTOR Observations of the Early Afterglow
  92. GRB 140129A: MITSuME Okayama upper limits
  93. GRB 140129B: Enhanced Swift-XRT position
  94. GRB 140129A, Swift-BAT refined analysis
  95. GRB 140129A: Swift/UVOT Observations
  96. GRB 140129A: Swift-XRT refined Analysis
  97. GRB 140129B: Swift detection of a burst with an optical afterglow
  98. GRB 140129A: Enhanced Swift-XRT position
  99. GRB 140129A: RATIR Optical and NIR Observations
  100. GRB 140129A: Swift detection of a burst with an optical afterglow

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