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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"

27049 results found.

  1. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  2. GRB 141118A: Fermi GBM Detection
  3. GRB 141121A: LCO-FTN rebrightening confirmation
  4. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  5. GRB 141121A: Continued RATIR Optical Observations
  6. GRB 141121A: Swift-XRT refined Analysis
  7. GRB 141121A: Swift/UVOT Detections
  8. GRB 141121A: RATIR Optical Observations
  9. GRB 141121A: Swift-BAT refined analysis
  10. GRB 141121A: LCO-FTN observations
  11. GRB 141118A: iPTF Optical Observations
  12. GRB 141121A: GROND Afterglow candidate
  13. GRB 141121A: MAXI/GSC detection
  14. GRB 141121A: Swift detection of a burst
  15. GRB 141109A: further VLA observations
  16. GRB 141104A: further Swift-XRT observations and afterglow candidate
  17. Swift Trigger 618673: probable noise event
  18. Trigger 618634: Swift detection of Vela X-1
  19. GRB 141015A: TAROT La Silla observatory optical observations
  20. GRB 141022A: TAROT La Silla observatory optical observations
  21. GRB 141031A: TAROT La Silla observatory optical observations
  22. GRB 141109A: TAROT La Silla observatory optical observations
  23. Swift Trigger 618402: probable noise event
  24. Swift Trigger 618391 is not an astrophysical event
  25. GRB 141109A: Terskol photometry
  26. GRB 141109B: Swift/UVOT Upper Limits
  27. GRB 141109A: Swift/UVOT Detection
  28. Konus-Wind observation of GRB 141109A
  29. GRB 141109B: Swift-XRT refined Analysis
  30. Swift Trigger 618134 is not an astrophysical event
  31. GRB 141109A: Swift-XRT refined Analysis
  32. GRB 141109B: Swift-BAT refined analysis
  33. GRB 141109A: Swift-BAT refined analysis
  34. GRB 141109A: GROND afterglow observation
  35. GRB 141109B: Swift detection of a burst
  36. GRB 141109A: Swift detection of a burst
  37. GRB 141104A: Swift-XRT observations
  38. GRB 141026A: Gemini-North optical and NIR imaging
  39. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  40. GRB 141102A possible precursor was another, known source
  41. GRB 141022A: Skynet PROMPT-CTIO Observations
  42. GRB 141102A: Fermi-LAT detection
  43. GRB 141102A: Fermi GBM detection
  44. GRB 141102A found in ground analysis of BAT data
  45. GRB 141031B: RATIR Optical and NIR Observation
  46. GRB 141031B: Swift/UVOT Upper Limits
  47. GRB 141031B: Swift-XRT refined Analysis
  48. GRB 141031B: Bassano Bresciano Observatory upper limit
  49. GRB 141031B: Swift-BAT refined analysis
  50. GRB 141031A, Swift-BAT refined analysis
  51. GRB 141031A: Swift/UVOT Upper Limits
  52. GRB 141031B: TShAO optical upper limit
  53. GRB 141031A: Swift-XRT refined Analysis
  54. GRB 141031A: Skynet PROMPT-CTIO Observations
  55. GRB 141004A: Continued Late Time RATIR Optical and NIR Observations
  56. GRB 141031A: Fermi GBM detection
  57. GRB 141031B: MASTER early optical observations
  58. GRB 141031B: Swift detection of a burst
  59. GRB 141031A: GROND detection of a possible optical afterglow candidate
  60. GRB 141031A: Swift detection of a burst
  61. GRB 141029A: Nanshan optical upper limit
  62. GRB 141028A: SAO RAS Zeiss-1000 photometry
  63. GRB 140509A: GROND afterglow detection
  64. GRB 141028A: Continued RATIR Observations
  65. GRB 141028A: Swift/UVOT followup observations
  66. GRB 141029B: Fermi GBM detection
  67. GRB 141028A: Swift-XRT observations
  68. GRB 141028A: LCOGTN observations
  69. GRB141028A: Gemini-North redshift
  70. GRB 141028A: RATIR Optical and NIR Observations
  71. GRB 141028A: Swift/UVOT Detection
  72. GRB 141028A: Swift/XRT detection of the X-ray afterglow
  73. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  74. GRB 141028A: Fermi GBM detection
  75. GRB 141026A: Continued RATIR Optical and NIR Observations
  76. GRB 141028A: Fermi-LAT detection
  77. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  78. GRB 141026A: SAO RAS Zeiss-1000 observations
  79. GRB 141026A: Continued RATIR Optical and NIR Observations
  80. GRB 141026A: Swift/UVOT Upper Limits
  81. GRB 141004A: Continued RATIR Late Time Optical and NIR Observations
  82. GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
  83. GRB 141026A: Swift-XRT refined Analysis
  84. GRB 141026A: Swift-BAT refined analysis
  85. Fermi Gamma-ray Burst Monitor trigger 141026452 is not a GRB
  86. GRB 141026A: MASTER early optical observations
  87. GRB141026A: Deep P200 optical imaging
  88. GRB 141026A: GROND observations
  89. GRB 141026A: RATIR Optical Observations
  90. GRB 141026A: P60 early observations
  91. GRB 141026A: Swift detection of a burst
  92. Fermi Gamma-ray Burst Monitor trigger 141025734 is not a GRB
  93. GRB141022A: Fermi GBM Detection
  94. GRB141022B: Fermi GBM Detection
  95. GRB 141022A: Swift/UVOT Upper Limits
  96. GRB 141022A: Swift-BAT refined analysis
  97. GRB 141022A: Swift-XRT refined Analysis
  98. GRB141015A iTelescope observation
  99. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  100. GRB 141022A: Swift detection of a burst

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