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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"

37763 results found.

  1. Konus-Wind observation of GRB 180620B
  2. Konus-Wind observation of GRB 180620A
  3. GRB 180620B: VLT/X-shooter redshift
  4. Konus-Wind observation of GRB 180618A (a short GRB with extended emission)
  5. GRB 180620B: Swift-BAT refined analysis
  6. GRB 180613A: Afterglow confirmation and added photometry
  7. GROND observations of GRB 180620B
  8. GROND observations of GRB 180620A
  9. GRB 180620B: Swift-XRT refined Analysis
  10. GRB 180618B: CALET Gamma-Ray Burst Monitor detection
  11. GRB 180620A: Swift-BAT refined analysis
  12. GRB 180620B: Enhanced Swift-XRT position
  13. GRB 180620B: Fermi GBM detection
  14. GRB 180620A: KAIT Optical Observations
  15. GRB 180620A: Xinglong-2.16m optical observations
  16. GRB 180618A: Swift/UVOT Detection
  17. GRB 180618A: TSHAO optical upper limit
  18. GRB 180620A: Swift-XRT refined Analysis
  19. GRB 180620B: Swift detection of a burst with an optical counterpart
  20. GRB 180620A: COATLI Detection and Light Curve
  21. GRB 180620A: Swift/UVOT Detection
  22. GRB 180618A: Xinglong-2.16m optical upper limit
  23. GRB 180620A: LCO McDonald observations
  24. GRB 180620A: Enhanced Swift-XRT position
  25. GRB 180620A: MASTER OT observation
  26. GRB 180620A: ISON-MN afterglow confirmation
  27. GRB 180620A: RATIR Optical Afterglow Detection
  28. GRB 180620A: Swift detection of a burst with an optical counterpart
  29. GRB 180618A: MASTER OT observation (a short GRB with extended emission)
  30. GRB 180618A: Swift-BAT refined analysis (a short GRB with extended emission)
  31. GRB 180611A: AstroSat CZTI detection
  32. GRB 180618A: Fermi GBM detection
  33. GRB 180618A: Swift-XRT refined Analysis
  34. GRB 180618A: LT prompt observations
  35. GRB 180618A: Enhanced Swift-XRT position
  36. GRB 180618A: Swift detection of a burst with an optical counterpart
  37. GRB 180614A: AbAO optical observations
  38. GRB 180614A: 1.5m OSN I-band observation
  39. GRB 180614A: Swift/UVOT Upper Limits
  40. GRB 180614A: Swift-BAT refined analysis
  41. GRB 180529A: AstroSat CZTI detection
  42. GRB 180614A: NOT optical upper limits
  43. GRB 180614A: MASTER observation
  44. GRB 180614A: Swift-XRT refined Analysis
  45. GRB 180614A: Enhanced Swift-XRT position
  46. GRB 180614A: Swift detection of a burst
  47. GRB 180613A: Swift/UVOT Upper Limits
  48. GRB 180613A GROND observations: correction
  49. GRB 180613A GROND observations
  50. GRB 180613A, Swift-BAT refined analysis
  51. GRB 180613A: Possible IR afterglow
  52. GRB 180613A: Swift-XRT refined Analysis
  53. GRB 180613A: Enhanced Swift-XRT position
  54. GRB 180613A: Possible host galaxy at XRT position, or star
  55. GRB 180613A: Prompt enhanced Swift-XRT position
  56. Konus-Wind observation of GRB 180611A
  57. GRB 180613A: Swift detection of a burst
  58. GRB 180611A: Fermi GBM observation
  59. IPN Triangulation of GRB 180611A (long)
  60. GRB 180605A: Fermi GBM observation
  61. GRB 180605A: AstroSat CZTI detection
  62. IPN Triangulation of GRB 180605A (long)
  63. GW170817/GRB170817A: LBT optical detection
  64. GRB 180603A: AstroSat CZTI detection
  65. Fermi GBM trigger 180604900/549840956 likely not a GRB
  66. GRB 180602A: MITSuME Ishigakijima optical upper limits
  67. GRB 180602B: Fermi GBM detection
  68. GRB 180602A: Swift/UVOT Upper Limits
  69. GRB 180602A: MITSuME Akeno optical upper limits
  70. GRB 180602A: Swift-XRT refined Analysis
  71. GRB 180602A: Swift-BAT refined analysis
  72. GRB 180602A: MITSuME Okayama optical upper limits
  73. GRB 180602A: Enhanced Swift-XRT position
  74. GRB 180602A: Swift detection of a burst
  75. Fermi GBM trigger 549533811/180601345 is not a GRB
  76. Konus-Wind observation of GRB 180529A
  77. GRB 180529A: CALET Gamma-Ray Burst Monitor detection
  78. IPN Triangulation of GRB 180529A (short/hard)
  79. Swift Trigger 834937 is not a GRB
  80. Konus-Wind observation of GRB 180526A
  81. IPN Triangulation of GRB 180526A (long)
  82. GRB 180526A: CALET Gamma-Ray Burst Monitor detection
  83. Konus-Wind observation of GRB 180523A
  84. GRB 180526A: AstroSat CZTI detection
  85. AGILE/MCAL detection of GRB 180529 and a possible precursor
  86. IPN Triangulation of GRB 180523A
  87. GRB180523B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 548793993)
  88. GRB 180523A: CALET Gamma-Ray Burst Monitor detection
  89. Fermi GBM trigger 548829437/180524192 is not a GRB
  90. GRB 180514A: MITSuME Ishigakijima optical upper limits
  91. GRB 180514A: CrAO/ZTSH optical observations and afterglow candidate
  92. GRB 180505A: AstroSat CZTI detection
  93. GRB 180514A: Swift/UVOT Upper Limits
  94. GRB 180514A: MITSuME Akeno optical upper limits
  95. GRB 180514A: Detection limits from 2.5m NOT
  96. GRB 180510A: MITSuME Ishigakijima optical upper limits
  97. GRB 180514A: 1.5m OSN optical observations
  98. GRB 180514A: GOTO Optical Observations
  99. GRB 180514A: Swift-BAT refined analysis
  100. GRB 180514A: Swift-XRT refined Analysis

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