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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

19710 results found.

  1. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  2. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  3. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  4. GRB 130831A: optical observation in Chuguev AO
  5. GRB 130831A: optical observation in Gissar AO
  6. GRB 130907A: Swift detection of a burst with an optical counterpart
  7. Swift follow-up results of the possible weak INTEGRAL GRB
  8. GRB 130903A: Swift/UVOT Upper Limits
  9. Swift follow-up of an INTEGRAL possible weak GRB
  10. GRB 130831A: RATIR Optical and NIR Upper Limits
  11. GRB 130903A: GROND Afterglow Discovery
  12. GRB 130903A: Swift-XRT observations
  13. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  14. GRB 130903A: GROND Upper Limits
  15. GRB 130831A: Swift/UVOT Observations
  16. GRB 130831A: Optical Observations via Virtual Telescope, follow-up
  17. GRB 130831A: RATIR Optical and NIR Observations
  18. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  19. GRB 130831A: T100 observations
  20. GRB 130831B: Swift/UVOT Upper Limits
  21. GRB 130831B: GROND upper limits
  22. Swift Trigger 569022: a possible GRB
  23. GRB 130831B: Swift-XRT refined Analysis
  24. GRB 130831A: Optical Observations via Virtual Telescope
  25. GRB 130831B: Enhanced Swift-XRT position
  26. GRB 130831A: Skynet/PROMPT-SSO detections
  27. GRB 130831A: Enhanced Swift-XRT position
  28. GRB 130831A: MITSuME Akeno Optical observation
  29. GRB 130831A: Weihai optical observations
  30. GRB 130831B: Swift detection of a burst
  31. GRB 130831A: Swift detection of a burst with an optical counterpart
  32. GRB 130822A: optical upper limits
  33. GRB 130829A: AAO optical observations
  34. GRB 130828A: Swift XRT and UVOT observations
  35. GRB 130829A: NOT optical observations
  36. IPN triangulation of GRB 130828A
  37. GRB 130828A: Fermi GBM detection
  38. GRB 130821A: Weihai optical upper limit
  39. GRB 130821A: Swift-XRT observation
  40. GRB 130822A: 5.8 GHz VLA upper limit
  41. GRB 130822A: Gemini Observations
  42. GRB 130822A: Swift/UVOT Upper Limits
  43. GRB 130822A: Enhanced Swift-XRT position
  44. GRB 130821A: Fermi-LAT detection of a burst
  45. GRB 130822A: Weihai optical upper limit
  46. GRB 130822A: Swift detection of a short burst
  47. GRB 130816A: Swift/UVOT Upper Limits
  48. GRB 130816B: Swift/UVOT Upper Limits
  49. GRB 130816B: GROND afterglow candidate
  50. GRB 130816B: Enhanced Swift-XRT position
  51. GRB 130816A: GROND confirmation of afterglow
  52. GRB 130816A: Enhanced Swift-XRT position
  53. GRB 130816B: Swift detection of a burst
  54. GRB 130816A: REM NIR candidate afterglow
  55. GRB 130816A: Swift detection of a burst
  56. Refined IPN Triangulation of GRB 130812B
  57. IPN Triangulation of GRB 130812B (long/soft)
  58. GRB 130812A: Swift/UVOT Upper Limits
  59. GRB 130812A: GROND upper limits
  60. GRB 130812A: Swift-XRT refined Analysis
  61. GRB 130812A: Enhanced Swift-XRT position
  62. GRB 130812A: Swift detection of a burst
  63. GRB130807A: Swift/UVOT observations
  64. GRB 130806A: Swift/UVOT Upper Limits
  65. GRB 130807A: Swift detection of a GRB or Galactic transient
  66. GRB 130623A: GROND detection of the optical/NIR afterglow
  67. GRB 130806A: MITSuME Akeno Optical observation
  68. GRB 130806A: MITSuME Okayama upper limits
  69. IPN localization of GRB 130804A
  70. GRB130803A: GROND observations
  71. GRB 130806A: Enhanced Swift-XRT position
  72. GRB 130806A: Swift detection of a burst
  73. Trigger 565443: Swift detection of a burst from SGR J1745-29
  74. GRB 130803A: RATIR Optical and NIR Observations
  75. GRB130803A: GROND detection of possible host
  76. GRB 130803A: Swift/UVOT Upper Limits
  77. GRB 130803A, Swift-BAT refined analysis
  78. GRB 130803A: Enhanced Swift-XRT position
  79. GRB 130803A: Faulkes Telescope South Observations
  80. GRB 130803A: Swift detection of a burst
  81. GRB 130727A: Watcher optical limit
  82. GRB 130722A: RATIR Optical Observations
  83. GRB 130727A: Swift/UVOT Detection
  84. GRB 130727A: Fermi GBM detection
  85. GRB 130727A: GROND observations
  86. GRB 130727A: Enhanced Swift-XRT position
  87. GRB 130727A: Swift-XRT observations
  88. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  89. GRB 130725B: Swift/UVOT Observations
  90. GRB 130725A: Swift-XRT refined Analysis
  91. GRB 130725B, Swift-BAT refined analysis
  92. GRB 130725B: Swift-XRT refined Analysis
  93. GRB130725B: REM-ROS2 optical observations
  94. GRB 130725B - UVOT-enhanced XRT position
  95. GRB 130725A: Swift/UVOT Upper Limits
  96. GRB 130725A - Faulkes Telescope South Observations
  97. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  98. GRB 130725A: MITSuME Ishigakijima Optical Observation
  99. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  100. GRB 130725A, Swift-BAT refined analysis

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