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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"

26292 results found.

  1. GRB 130504B: Fermi GBM detection
  2. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  3. GRB 130502B: Suzaku WAM observation of the prompt emission
  4. GRB 130504A: Swift/UVOT Upper Limits
  5. GRB 130502B: Swift-XRT refined Analysis
  6. GRB 130504A, Swift-BAT refined analysis
  7. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  8. GRB 130502B: possible TNG counterpart
  9. Trigger 555096: Swift detection of a possible burst
  10. GRB 130502A: Swift-BAT refined analysis
  11. GRB 130427A: Non-observation of VHE emission with HAWC
  12. GRB 130502A: Swift-XRT refined Analysis
  13. GRB 130502A: Fermi GBM detection
  14. GRB 130502B: Swift/UVOT Upper Limits
  15. GRB 130502A: Swift/UVOT Upper Limits
  16. GRB 130502B: P60 Observations
  17. GRB 130502B Swift-XRT observations
  18. GRB 130502A: RATIR Optical and NIR Observations
  19. GRB 130502B: Fermi LAT Detection
  20. GRB 130502A: TNG candidate counterpart
  21. GRB 130502B: Fermi GBM detection of a burst
  22. GRB 130502A: T100 Observations
  23. GRB 130502A: Swift detection of a burst
  24. GRB 130427A: Predictions about the occurrence of a supernova
  25. GRB 130427A: KAIT optical observations
  26. GRB 130425A: Suzaku WAM observation of the prompt emission
  27. GRB 130427A: High-energy neutrino search
  28. GRB 130427A: Continued RATIR Optical and NIR Observations
  29. Swift-BAT trigger 554135 is noise
  30. GRB 130427A: Challis Observatory optical observations
  31. GRB 130427A: Continued Skynet/PROMPT Observations
  32. GRB 130427A: further GMG observations
  33. GRB 130427A: Fermi-LAT refined analysis
  34. GRB 130427A: Continued RATIR Optical and NIR Observations
  35. GRB 130427A: CrAO RT-22 36 GHz observation
  36. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  37. GRB 130427A: Improved Swift-XRT analysis
  38. GRB 130425: MASTER-Net optical observations
  39. GRB 100728A: GROND host detection and X-shooter redshift
  40. GRB 130427A: Skynet/PROMPT Observations
  41. GRB 130427B: RATIR Optical and NIR Observations
  42. GRB 130427A : Xinglong TNT optical observation
  43. GRB 130427A optical time series
  44. Konus-Wind observation of GRB 130427A
  45. GRB 130427A: Kanata/HOWPol optical imaging polarimetry
  46. GRB 130427A: Swift-XRT refined Analysis
  47. GRB 130427A: Continued RATIR Optical and NIR Observations
  48. GRB 130427B: Swift-XRT refined Analysis
  49. GRB 130427A: NOT optical photometry and redshift
  50. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  51. GRB 130427A: T100 observations
  52. GRB 130427A: Fermi GBM observation
  53. GRB 130427A: Fermi-LAT detection of a burst
  54. GRB 130427A: Swift-BAT refined analysis
  55. GRB 130427B: Swift-BAT refined analysis
  56. GRB 130427A: Zadko observatory - Gingin optical observations
  57. GRB 130427A: MAXI/GSC detection
  58. GRB 130427B: Faulkes Telescope North afterglow detection
  59. GRB 130427B: Swift detection of a burst with optical counterpart
  60. GRB 130427A: RATIR Optical and NIR Observations
  61. GRB 130427A: Weihai optical observations
  62. GRB 130427A: MITSuME Akeno Optical observation(T0+8000s~)
  63. GRB 130427A: PAIRITEL NIR Detections
  64. GRB 130427A: Faulkes Telescope North detection
  65. GRB 130427A: P60 early nondetection
  66. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  67. GRB 130420A: Continued Skynet/GORT Observations/Detections
  68. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  69. GRB 130425A: Fermi GBM detection
  70. GRB 130420A: Continued RATIR Optical and NIR Observations
  71. GRB 130420A: ROTSE-III data analysis
  72. GRB 130420A: Continued RATIR Optical and NIR Observations
  73. GRB 130418A: Continued RATIR Optical and NIR Observations
  74. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  75. GRB 130420B: Fermi GBM observation
  76. Swift Trigger 554135 is probably not a GRB or transient
  77. GRB 130420B: RATIR Optical and NIR Observations
  78. GRB 130420A: Continued RATIR Optical and NIR Observations
  79. GRB 130420B: Swift-XRT refined Analysis
  80. GRB 130420A: Fermi GBM observation
  81. GRB 130420A: ISON-NM optical observations
  82. Skynet/GORT observations of GRB130420A
  83. GRB 130420B: Weihai optical upper limit
  84. GRB 130420B: Swift/UVOT Upper Limits
  85. GRB 130420A: Swift/UVOT Detection
  86. GRB 130420A: Swift-XRT refined Analysis
  87. GRB 130420B, Swift-BAT refined analysis
  88. GRB 130420A, Swift-BAT refined analysis
  89. Konus-Wind observation of GRB 130418A
  90. GRB130420A : Xinglong TNT optical upper limit
  91. GRB 130420B: Faulkes Telescope North observations
  92. GRB 130420A: Weihai Optical Observations
  93. GRB 130420B: Swift detection of a burst
  94. GRB 130420A: RATIR Optical and NIR Observations
  95. GRB 130420A: PAIRITEL NIR detections
  96. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  97. GRB 130420A: Swift detection of a burst with an optical counterpart
  98. GRB 130420A: Faulkes Telescope North candidate
  99. GRB 130418A: Continued RATIR Optical and NIR Observations
  100. GRB 130418A: Swift-XRT refined Analysis

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