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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"

41670 results found.

  1. GRB 141109A: AAO optical observations
  2. Swift Trigger 618402: probable noise event
  3. GRB 141109A: Terskol photometry
  4. GRB 141109B: Swift/UVOT Upper Limits
  5. GRB 141109A: Swift/UVOT Detection
  6. GRB 141109A: NOT r-band observation
  7. Konus-Wind observation of GRB 141109A
  8. GRB 141109B: MITSuME Akeno upper limits
  9. GRB141109A : Xinglong TNT optical observation
  10. GRB 141109B: Swift-XRT refined Analysis
  11. GRB 141109A: MITSuME Ishigakijima upper limits
  12. GRB 141109A: Swift-XRT refined Analysis
  13. GRB 141109B: BOOTES-4 and TERSKOL optical upper limit
  14. GRB 141109B: Swift-BAT refined analysis
  15. GRB 141109A: Swift-BAT refined analysis
  16. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  17. GRB 141109A: GROND afterglow observation
  18. X-shooter redshift of GRB 141109A
  19. GRB 141109A: REM NIR candidate afterglow
  20. GRB 141109B: Swift detection of a burst
  21. GRB 141109A: Swift detection of a burst
  22. GRB 141104A: Swift-XRT observations
  23. GRB 141028A: Mondy optical observations
  24. GRB 141104A Tiled Swift observations
  25. GRB 141026A: CrAO optical observation
  26. GRB
  27. GRB 141026A: Gemini-North optical and NIR imaging
  28. GRB 141028A: TShAO optical observation
  29. GRB 141031B: TShAO optical observations
  30. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  31. Konus-Wind observation of GRB 141104A
  32. IPN Triangulation of GRB 141104A (long/very bright)
  33. GRB 141102A possible precursor was another, known source
  34. Konus-Wind observation of GRB 141102A
  35. GRB 141022A: Skynet PROMPT-CTIO Observations
  36. GRB 141102A: Fermi-LAT detection
  37. GRB 141102A: Fermi GBM detection
  38. GRB 141102A found in ground analysis of BAT data
  39. GRB 141026A: VLA observations
  40. GRB 141031B: RATIR Optical and NIR Observation
  41. GRB 141031B: Swift/UVOT Upper Limits
  42. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  43. GRB 141031B: Swift-XRT refined Analysis
  44. GRB 141031B: Bassano Bresciano Observatory upper limit
  45. GRB 141031B: NOT optical observations
  46. GRB 141031B: MITSuME Ishigakijima upper limits
  47. GRB 141031B: Swift-BAT refined analysis
  48. GRB 141031A, Swift-BAT refined analysis
  49. GRB 141031A: Swift/UVOT Upper Limits
  50. GRB 141031B: TShAO optical upper limit
  51. GRB 141031B: 1.23m CAHA I-band observations
  52. GRB 141031A: Swift-XRT refined Analysis
  53. GRB 141031A: Skynet PROMPT-CTIO Observations
  54. GRB 141004A: Continued Late Time RATIR Optical and NIR Observations
  55. GRB 141031A: VLT/X-shooter optical observations
  56. GRB 141031A: Fermi GBM detection
  57. GRB 141031B: Nanshan optical upper limit
  58. GRB 141031B: MASTER early optical observations
  59. GRB 141031B: Swift detection of a burst
  60. GRB 141031A: GROND detection of a possible optical afterglow candidate
  61. GRB 141031A: Swift detection of a burst
  62. GRB 141029A: Nanshan optical upper limit
  63. GRB 141028A: SAO RAS Zeiss-1000 photometry
  64. GRB 140509A: GROND afterglow detection
  65. GRB 141028A: Continued RATIR Observations
  66. GRB 141028A: Swift/UVOT followup observations
  67. GRB 141028A: P60 Observations and Decay Index
  68. IPN triangulation of GRB 141029B
  69. GRB 141029B: Fermi GBM detection
  70. GRB 141028A: Swift-XRT observations
  71. GRB 141028A: LCOGTN observations
  72. GRB 141029A Tiled Swift observations
  73. GRB 141028A: VLT/X-shooter redshift of z=2.33
  74. GRB141028A: Gemini-North redshift
  75. GRB 141029A: MAXI/GSC detection
  76. GRB 141028A: RATIR Optical and NIR Observations
  77. GRB 141028A: Swift/UVOT Detection
  78. GRB 141028A: Swift/XRT detection of the X-ray afterglow
  79. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  80. GRB 141020A: Continued Mondy Observations, optical upper limit
  81. IPN triangulation of GRB 141028A
  82. GRB 141028A Tiled Swift observations
  83. GRB 141028A: MASTER OT candidate detection
  84. GRB 141028A: Fermi GBM detection
  85. GRB 141026A: Continued RATIR Optical and NIR Observations
  86. GRB 141028A: Fermi-LAT detection
  87. GRB 141026A: GTC spectroscopy
  88. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  89. GRB 141026A: SAO RAS Zeiss-1000 observations
  90. GRB 141026A: Continued RATIR Optical and NIR Observations
  91. GRB 141026A: Swift/UVOT Upper Limits
  92. GRB 141004A: Continued RATIR Late Time Optical and NIR Observations
  93. GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
  94. GRB 141026A: Swift-XRT refined Analysis
  95. GRB 141026A: Swift-BAT refined analysis
  96. Fermi Gamma-ray Burst Monitor trigger 141026452 is not a GRB
  97. GRB 141026A: MASTER early optical observations
  98. GRB141026A: Deep P200 optical imaging
  99. GRB 141026A: 1.23m CAHA I-band observations
  100. GRB 141026A: GROND observations

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