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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"

27419 results found.

  1. GRB 130502B: Fermi GBM detection of a burst
  2. GRB 130502A: T100 Observations
  3. GRB 130502A: Swift detection of a burst
  4. GRB 130427A: Predictions about the occurrence of a supernova
  5. GRB 130427A: KAIT optical observations
  6. GRB 130427A: High-energy neutrino search
  7. GRB 130427A: Continued RATIR Optical and NIR Observations
  8. Swift-BAT trigger 554135 is noise
  9. GRB 130427A: Challis Observatory optical observations
  10. GRB 130427A: Continued Skynet/PROMPT Observations
  11. GRB 130427A: further GMG observations
  12. GRB 130427A: Fermi-LAT refined analysis
  13. GRB 130427A: Continued RATIR Optical and NIR Observations
  14. GRB 130427A: CrAO RT-22 36 GHz observation
  15. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  16. GRB 130427A: Improved Swift-XRT analysis
  17. GRB 130425: MASTER-Net optical observations
  18. GRB 100728A: GROND host detection and X-shooter redshift
  19. GRB 130427A: Skynet/PROMPT Observations
  20. GRB 130427B: RATIR Optical and NIR Observations
  21. GRB 130427A : Xinglong TNT optical observation
  22. GRB 130427A optical time series
  23. Konus-Wind observation of GRB 130427A
  24. GRB 130427A: Kanata/HOWPol optical imaging polarimetry
  25. GRB 130427A: Swift-XRT refined Analysis
  26. GRB 130427A: SPI-ACS/INTEGRAL observations
  27. GRB 130427A: Continued RATIR Optical and NIR Observations
  28. GRB 130427B: Swift-XRT refined Analysis
  29. GRB 130427A: NOT optical photometry and redshift
  30. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  31. GRB 130427A: T100 observations
  32. GRB 130427A: Fermi GBM observation
  33. GRB 130427A: Fermi-LAT detection of a burst
  34. GRB 130427A: Swift-BAT refined analysis
  35. GRB 130427B: Swift-BAT refined analysis
  36. GRB 130427A: Zadko observatory - Gingin optical observations
  37. GRB 130427A: Optical Observations
  38. GRB 130427A: MAXI/GSC detection
  39. GRB 130427B: Faulkes Telescope North afterglow detection
  40. GRB 130427B: Swift detection of a burst with optical counterpart
  41. GRB 130427A: RATIR Optical and NIR Observations
  42. GRB 130427A: Weihai optical observations
  43. GRB 130427A: MITSuME Akeno Optical observation(T0+8000s~)
  44. GRB 130427A: PAIRITEL NIR Detections
  45. GRB 130427A: Faulkes Telescope North detection
  46. GRB 130427A: P60 early nondetection
  47. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  48. GRB 130420A: Continued Skynet/GORT Observations/Detections
  49. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  50. GRB 130425A: Fermi GBM detection
  51. GRB 130420A: Continued RATIR Optical and NIR Observations
  52. GRB 130420A: ROTSE-III data analysis
  53. GRB 130420A: Continued RATIR Optical and NIR Observations
  54. GRB 130418A: Continued RATIR Optical and NIR Observations
  55. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  56. GRB 130420B: Fermi GBM observation
  57. Swift Trigger 554135 is probably not a GRB or transient
  58. GRB 130420B: RATIR Optical and NIR Observations
  59. GRB 130420A: Continued RATIR Optical and NIR Observations
  60. GRB 130420B: Swift-XRT refined Analysis
  61. GRB 130420A: Fermi GBM observation
  62. GRB 130420A: ISON-NM optical observations
  63. Skynet/GORT observations of GRB130420A
  64. GRB 130420B: Weihai optical upper limit
  65. GRB 130420B: Swift/UVOT Upper Limits
  66. GRB 130420A: Swift/UVOT Detection
  67. GRB 130420A: Swift-XRT refined Analysis
  68. GRB 130420B, Swift-BAT refined analysis
  69. GRB 130420A, Swift-BAT refined analysis
  70. Konus-Wind observation of GRB 130418A
  71. GRB130420A : Xinglong TNT optical upper limit
  72. GRB 130420B: Faulkes Telescope North observations
  73. GRB 130420A: Weihai Optical Observations
  74. GRB 130420B: Swift detection of a burst
  75. GRB 130420A: RATIR Optical and NIR Observations
  76. GRB 130420A: PAIRITEL NIR detections
  77. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  78. GRB 130420A: Swift detection of a burst with an optical counterpart
  79. GRB 130420A: Faulkes Telescope North candidate
  80. GRB 130418A: Continued RATIR Optical and NIR Observations
  81. GRB 130418A: Swift-XRT refined Analysis
  82. Swift Trigger 553930 is not an astrophysical source
  83. GRB 130419A, Swift-BAT refined analysis
  84. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  85. Trigger 553930: Swift detection of a possible flare from HR 5110
  86. GRB 130418A: LOAO Observation
  87. GRB 130418A, Swift-BAT refined analysis
  88. GRB 130419A: Swift detection of a burst
  89. GRB 130418A: RATIR Optical and NIR Observations
  90. GRB 130418A: GROND detection of the optical-NIR afterglow
  91. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  92. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  93. GRB 130418A: Bassano Bresciano Observatory optical observations
  94. GRB 130418A: Swift detection of a burst with an optical counterpart
  95. GRB 130408a: Skynet Optical Observations
  96. GRB 130408A, Swift-BAT refined analysis
  97. GRB 130408A: Zadko observatory - Gingin optical observations
  98. GRB130408A: Swift/UVOT followup observations
  99. GRB 130408A: Swift-XRT refined Analysis
  100. Konus-Wind observation of GRB 130408A

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