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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"

23595 results found.

  1. GRB 131024A: Swift detection of a burst
  2. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  3. IPN Triangulation of GRB 131014A
  4. GRB 131018B: Swift/UVOT Upper Limits
  5. GRB 131018B: Swift-XRT observations
  6. GRB 131018A: RATIR Optical and NIR Observations
  7. GRB 131018A: Swift/UVOT Upper Limits
  8. GRB 131018A: Enhanced Swift-XRT position
  9. GRB131018A, optical observations
  10. GRB 131018A: Swift detection of a burst
  11. GRB 131014A: Suzaku WAM observation of the prompt emission
  12. GRB 131014A: GROND observations
  13. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  14. GRB 131011A: Swift/UVOT Upper Limits
  15. GRB 131014A: Swift/UVOT Upper Limits
  16. GRB 131014A: RATIR Optical and NIR Observations
  17. GRB 131014A: Enhanced XRT position
  18. GRB 131014A: NOT afterglow candidate
  19. GRB 131014A: Nanshan optical observations
  20. GRB 131014A: Fermi-LAT detection
  21. GRB 131014A: Fermi GBM detection
  22. GRB 131011A: Fermi GBM detection
  23. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  24. GRB 131011A: GROND afterglow observations
  25. Fermi403206457: continued P60 observations and fading behavior
  26. Fermi403206457: Weihai optical upper limit
  27. Trigger 574266 is not a Swift detection of a known source
  28. GRB 130831A: Continued RATIR Optical and NIR Observations
  29. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  30. GRB 131004A: CARMA 93 GHz upper limit
  31. GRB 131004A: Swift/UVOT Detection
  32. GRB 131004A: RATIR Optical and NIR Upper Limits
  33. GRB 131004A: GROND observations of the afterglow
  34. GRB 131004A: Enhanced Swift-XRT position
  35. GRB131004A: Magellan Redshift
  36. GRB 131004A: Liverpool Telescope optical afterglow observations
  37. GRB 131004A: TNG optical afterglow confirmation
  38. GRB 131004A: optical afterglow from the NOT
  39. GRB 131004A: Swift detection of a burst (may be short)
  40. GRB 130925A: 3mm observations with CARMA
  41. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  42. GRB 131002B: GROND upper limits
  43. GRB 131002B: Swift/UVOT Upper Limits
  44. GRB 131002A: Swift/UVOT Detection
  45. GRB 131002A: Swift-XRT refined Analysis
  46. GRB 131002B: Enhanced Swift-XRT position
  47. Swift J1242.9-3530, Swift-BAT refined analysis
  48. GRB 131001A: Swift UVOT and XRT Upper Limits
  49. GRB 131002A: Enhanced Swift-XRT position
  50. NuSTAR observations of GRB 130925A
  51. GRB 131002B: Swift detection of a burst
  52. GRB 131002A: Swift detection of a burst
  53. GRB 130930A: Swift detection of a burst
  54. GRB 130929A: Swift/UVOT Upper Limits
  55. GRB 130831A: Continued RATIR Optical and NIR Observations
  56. GRB 130929A: Enhanced Swift-XRT position
  57. GRB 130929A: TAROT La Silla observatory optical observations
  58. GRB 130929A: Swift detection of a burst
  59. Fermi LAT Upper Limits on GRB 130925A
  60. GRB 130925A: Swift/UVOT Upper Limits
  61. GRB 130925A: sub-mm non-detection with SMA
  62. GRB 130925A: optical upper limit
  63. GRB 130925A: Continued RATIR Optical and NIR Observations
  64. GRB 130925A: Fermi GBM Detection
  65. Konus-Wind observation of GRB 130925A
  66. GRB 130925A: RATIR Optical and NIR Observations
  67. GRB 130925A Swift-BAT refined analysis
  68. GRB 130925A: Historical non-detection from Rosat-HRI
  69. Fermi GBM detection of GRB 130925A and a possible precursor
  70. GRB 130925A: Swift-XRT refined Analysis
  71. GRB 130925A: TAROT La Silla observatory optical observations
  72. GRB 130925A: Enhanced Swift-XRT position
  73. GRB 130925A: VLT/UVES observations
  74. GRB 130925A: GROND afterglow candidate
  75. GRB 130925A: Swift detection of a burst
  76. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  77. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  78. GRB 130903A: optical observations
  79. GRB 130907A: Maidanak optical observations
  80. GRB 130912A: AAO optical upper limit
  81. Fermi Trigger 401326696: MASTER prompt optical observations
  82. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  83. GRB 130919A, Swift-BAT refined analysis
  84. GRB 130913A detected in ground analysis of Swift-BAT data
  85. GRB 130919A: Swift detection of a burst
  86. GRB 130903A: Further Swift XRT observations.
  87. GRB 130912A: Swift/UVOT Upper Limits
  88. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  89. GRB 130912A: 5.8 GHz VLA upper limit
  90. GRB 130912A: RATIR Optical and NIR Upper Limits
  91. Konus-Wind observation of GRB 130912A
  92. GRB 130907A: Continued RATIR Optical and NIR Observations
  93. GRB 130912A: P60 Observations
  94. GRB 130912A: Swift-XRT refined Analysis
  95. GRB 130907A: MASTER refined analysis
  96. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  97. GRB 130912A: Enhanced Swift-XRT position
  98. GRB 130912A: REM optical/NIR upper limits
  99. GRB 130912A: GROND observations
  100. GRB 130912A: Swift detection of a short burst

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