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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"

26767 results found.

  1. GRB 140304A: Swift-XRT refined Analysis
  2. GRB 140304A: Fermi GBM detection
  3. GRB 140304A: Swift/UVOT Upper Limits
  4. GRB 140304A: Khureltogot optical observations
  5. GRB 140304A: Mondy optical observations
  6. GRB 140304A: Afterglow decay from Nanshan observations
  7. GRB 140304A: Swift detection of a burst
  8. GRB 140304A: MASTER OT detecton
  9. GRB 140301A: Swift/UVOT Upper Limits
  10. GRB 140302A: Swift/UVOT Upper Limits
  11. GRB140302A: Fermi GBM detection
  12. GRB 140302A: Swift-XRT refined Analysis
  13. GRB 140302A: Swift-BAT refined analysis
  14. GRB 140301A: Swift-BAT refined analysis
  15. GRB 140301A: Swift-XRT refined Analysis
  16. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  17. GRB 140302A: GROND afterglow candidate
  18. GRB 140302A: Swift detection of a burst
  19. GRB 140301A: NOT afterglow candidate
  20. GRB 140301A: Skynet R-COP Observations
  21. GRB 140301A: Swift detection of a burst
  22. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  23. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
  24. GRB 140219A: the confirmation of the brightening SDSS J102406.41+062937.6 star
  25. GRB 140219A: MASTER optical brightening inside XRT-5 error box detection
  26. GRB 140219A: iPTF optical observations
  27. GRB 140102A: TAOS early optical afterglow detection
  28. GRB 140219A: XRT afterglow candidate
  29. GRB 140221A: Results from Swift XRT tiled observations
  30. GRB 140219A: results from Swift XRT and UVOT tiled observations
  31. GRB 140219A: MASTER before and after GRB observational arguments of the exceptionally Dark GRB
  32. GRB 140219A: Fermi-LAT detection of a burst
  33. GRB 140219A: Fermi GBM Detection
  34. IPN Triangulation of extremely bright long GRB 140219A
  35. Swift follow-up of an Integral weak transient
  36. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  37. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  38. Fermi GBM trigger 140214230 is not a GRB
  39. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  40. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  41. GRB 140211A: Khureltogot optical upper limits
  42. GRB 140215A: Continued RATIR Optical and NIR Observations
  43. Konus-Wind observation of GRB 140213A
  44. Konus-Wind observation of GRB 140215A
  45. GRB 140215A: Swift/UVOT Detection
  46. GRB 140211A: Swift-XRT and UVOT observations
  47. GRB140215A: Continued Discovery Channel Telescope Observations
  48. GRB 140215A: Continued RATIR Optical and NIR Observations
  49. GRB 140215A: Swift-BAT refined analysis
  50. GRB 140215A: ISON-NM optical observations
  51. GRB 140215A: Swift-XRT refined Analysis
  52. GRB 140215A: P60 observations
  53. GRB 140215A: RATIR Optical and NIR Observations
  54. GRB140215A: Skynet PROMPT Optical Observations
  55. GRB140215A: Prompt Observations with Discovery Channel Telescope
  56. GRB 140215A: Swift detection of a burst with optical counterpart
  57. GRB 140213A: Swift-BAT refined analysis
  58. GRB140206A: Discovery Channel Telescope Optical Detection
  59. GRB 140213A: Swift/UVOT Observations
  60. GRB 140213A: Fermi GBM Detection
  61. GRB 140213A: Swift-XRT refined Analysis
  62. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  63. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  64. GRB 140213A: Swift-XRT observations
  65. GRB 140213A: Swift/UVOT Detection
  66. GRB 140213A: Swift detection of a burst
  67. GRB140211A : Xinglong TNT upper limit
  68. Trigger 586482: Swift detection of GROJ1744-28
  69. GRB140209A: Swift/UVOT observations.
  70. GRB 140211A: Swift-BAT refined analysis
  71. GRB 140209A: Swift-XRT observations
  72. Konus-Wind observation of GRB 140209A
  73. GRB 140211A: MITSuME Okayama upper limits
  74. GRB 140211A: Swift detection of a burst
  75. GRB 140209A: Early RAPTOR Optical Detection
  76. GRB 140209A: Swift-BAT Spectral lag analysis
  77. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  78. GRB 140209A, Swift-BAT refined analysis
  79. GRB 140209A: Fermi GBM observation
  80. GRB 140209A: optical observations
  81. GRB 140209A: P60 optical afterglow detection
  82. GRB 140209A: Swift detection of a burst
  83. GRB 140206A: Liverpool Telescope optical afterglow observations
  84. GRB 140206A, Swift-BAT refined analysis
  85. GRB 140206A: Swift-XRT refined Analysis
  86. GRB 140206A: T100 observations
  87. GRB 140206A: Fermi GBM detection
  88. GRB 140206A: Swift/UVOT Detection
  89. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  90. GRB 140206A: ISON-Ussuriysk optical observations
  91. GRB 140206B: Fermi-LAT detection
  92. GRB 140206B: Fermi GBM detection
  93. GRB 140206A: MASTER OT detection
  94. GRB 140206A: Swift/UVOT optical detection
  95. GRB 140206A: Swift detection of a burst
  96. GRB 140129A: Continued RATIR Optical and NIR Observations
  97. GRB 140129B: Swift/UVOT Detection
  98. GRB 140129A: Continued RATIR Optical and NIR Observations
  99. GRB 140129B: Swift-XRT refined Analysis
  100. GRB 140129B: MASTER OT early light curve

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