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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"

27394 results found.

  1. GRB 130925A: TAROT La Silla observatory optical observations
  2. GRB 130925A: Enhanced Swift-XRT position
  3. GRB 130925A: VLT/UVES observations
  4. GRB 130925A: MAXI/GSC detection
  5. GRB 130925A: GROND afterglow candidate
  6. GRB 130925A: Swift detection of a burst
  7. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  8. GRB 130831A: RTT150 optical observations
  9. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  10. GRB 130903A: optical observations
  11. GRB 130907A: Maidanak optical observations
  12. GRB 130912A: AAO optical upper limit
  13. Fermi Trigger 401326696: MASTER prompt optical observations
  14. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  15. GRB 130919A, Swift-BAT refined analysis
  16. GRB 130913A detected in ground analysis of Swift-BAT data
  17. GRB 130912A: Swift/UVOT Upper Limits
  18. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  19. GRB 130912A: 5.8 GHz VLA upper limit
  20. GRB 130912A: RATIR Optical and NIR Upper Limits
  21. GRB 130907A: Continued RATIR Optical and NIR Observations
  22. GRB 130912A: P60 Observations
  23. GRB 130912A: Swift-XRT refined Analysis
  24. GRB 130907A: MASTER refined analysis
  25. GRB 130912A: Fermi GBM detection
  26. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  27. GRB 130912A: Enhanced Swift-XRT position
  28. GRB 130912A, Swift-BAT refined analysis
  29. GRB 130912A: REM optical/NIR upper limits
  30. GRB 130912A: GROND observations
  31. GRB 130912A: Swift detection of a short burst
  32. GRB 120419A: Swift XRT confirmation of the afterglow
  33. GRB 130907A: Continued RATIR Optical and NIR Observations
  34. GRB 130907A: RATIR Optical and NIR Observations
  35. GRB 130828A: Further Swift XRT observations
  36. GRB 130907A: Further Swift-BAT refined analysis
  37. GRB 130907A: INTEGRAL/SPI-ACS light curve
  38. GRB 130907A, Swift-BAT refined analysis
  39. GRB 130907A: Swift-XRT refined Analysis
  40. GRB 130907A: Enhanced Swift-XRT position
  41. GRB 130907A: Swift/UVOT Detection
  42. GRB 130907A: Early Tautenburg detections, red afterglow
  43. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  44. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  45. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  46. GRB 130831A: Maidanak optical observations
  47. GRB 130831A: optical observation in Chuguev AO
  48. GRB 130831A: ISON-Kislovodsk optical observations
  49. GRB 130831A: optical observation in Gissar AO
  50. GRB 130831A: ISON-UAFO optical observations
  51. GRB 130907A: Swift detection of a burst with an optical counterpart
  52. Swift follow-up results of the possible weak INTEGRAL GRB
  53. GRB 130903A: Swift/UVOT Upper Limits
  54. Swift follow-up of an INTEGRAL possible weak GRB
  55. GRB 130831A: RATIR Optical and NIR Upper Limits
  56. GRB 130903A: GROND Afterglow Discovery
  57. GRB 130903A: Fermi GBM observation
  58. GRB 130903A: Swift-XRT observations
  59. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  60. GRB 130903A: GROND Upper Limits
  61. GRB 130831A: Swift/UVOT Observations
  62. GRB 130831A: Optical Observations via Virtual Telescope, follow-up
  63. GRB 130831A: RATIR Optical and NIR Observations
  64. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  65. GRB 130831B, Swift-BAT refined analysis
  66. GRB 130831A: T100 observations
  67. GRB 130831B: Swift/UVOT Upper Limits
  68. GRB 130831B: GROND upper limits
  69. Swift Trigger 569022: a possible GRB
  70. GRB 130831A, Swift-BAT refined analysis
  71. GRB 130831B: Swift-XRT refined Analysis
  72. GRB 130831A: Optical Observations via Virtual Telescope
  73. GRB 130831A: Swift-XRT refined Analysis
  74. GRB 130831B: Enhanced Swift-XRT position
  75. GRB 130831A: Skynet/PROMPT-SSO detections
  76. GRB 130831A: Enhanced Swift-XRT position
  77. GRB 130831A: MITSuME Akeno Optical observation
  78. GRB 130831A: Weihai optical observations
  79. GRB 130831B: Swift detection of a burst
  80. GRB 130831A: Faulkes Telescope North and South optical afterglow
  81. GRB 130831A: Swift detection of a burst with an optical counterpart
  82. GRB 130822A: optical upper limits
  83. GRB 130829A: AAO optical observations
  84. GRB 130828A: Swift XRT and UVOT observations
  85. GRB 130829A: NOT optical observations
  86. IPN triangulation of GRB 130828A
  87. GRB 130829A: Swift detection of a burst
  88. GRB 130828A: Fermi GBM detection
  89. GRB 130828A: Fermi-LAT detection of a burst
  90. GRB 130822A Swift-BAT Spectral lag analysis
  91. GRB 130821A: Weihai optical upper limit
  92. GRB 130821A: Swift-XRT observation
  93. GRB 130822A: 5.8 GHz VLA upper limit
  94. GRB 130822A: Swift-XRT refined Analysis
  95. GRB 130822A: Swift/UVOT Upper Limits
  96. GRB 130822A: Enhanced Swift-XRT position
  97. GRB 130822A, Swift-BAT refined analysis
  98. GRB 130821A: Fermi-LAT detection of a burst
  99. GRB 130822A: Weihai optical upper limit
  100. GRB 130821A: Fermi GBM Detection

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