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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"

37579 results found.

  1. GRB 150201A: Enhanced Swift-XRT position
  2. GRB 150201A: Swift detection of a burst
  3. GRB 150120B: Khureltogot optical observations
  4. GRB 150128A: MASTER OT detction during inspection
  5. GRB 150127B: Fermi GBM detection
  6. Konus-Wind observation of GRB 150127B
  7. GRB 150123A: MASTER inspection
  8. GRB 150120A: 9.8 GHz VLA upper limit
  9. IPN Triangulation of GRB 150127B
  10. IPN Triangulation of GRB 150127A
  11. GRB 150120A: Gemini-N imaging and host redshift
  12. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  13. GRB 150127A: Fermi-LAT detection
  14. GRB150127A: Fermi GBM Detection
  15. GRB 150126A: Fermi GBM Detection
  16. GRB 150126A: MAXI/GSC afterglow candidate detection
  17. Konus-Wind observation of GRB 150123A
  18. GRB 150120A: possible AMI 15 GHz detection
  19. GRB 150123A: Swift/UVOT observations
  20. GRB 150123A: Swift-XRT observations
  21. GRB 150120B: Mondy optical observations
  22. GRB 150123A Tiled Swift observations
  23. GRB 150123A: MAXI/GSC detection
  24. Konus-Wind observation of GRB 150118B
  25. GRB 150120B: RATIR Optical and NIR Observations
  26. IPN Triangulation of GRB 150118B (long/intense)
  27. GRB 150120A: ISON-NM early optical limit
  28. GRB 150120B: FTN early optical light curve
  29. GRB150120B: Xinglong TNT optical observation
  30. GRB 150120B: Swift/UVOT Upper Limits
  31. GRB 150120B, Optical observations
  32. GRB 150120B: GROND Afterglow Detection
  33. GRB 150120B: Additional P60 observations
  34. GRB 150120A: Swift-XRT refined Analysis
  35. GRB 150101B: Confirmation of a fading optical counterpart
  36. GRB 150120A: KAIT Optical Upper Limit
  37. GRB 150120B: MITSuME Okayama upper limits
  38. GRB 150120B: Swift-BAT refined analysis
  39. GRB 150120A: Swift-BAT refined analysis
  40. GRB 150118C: Fermi GBM Detection
  41. Konus-Wind observation of GRB 150118C
  42. GRB 150101B/Swift J123205.1-105602: TNG NIR follow-up
  43. GRB 150120B: Swift-XRT refined Analysis
  44. IPN triangulation of GRB 150118C (short/hard)
  45. GRB 150120A: Swift/UVOT Upper Limits
  46. GRB 150110B: AMI 15 GHz detection of possible radio counterpart
  47. GRB 150101B/Swift J123205.1-105602, deep VLT observations
  48. GRB 150120B: Enhanced Swift-XRT position
  49. GRB 150120A: Fermi GBM observation
  50. GRB 150101B/Swift J123205.1-105602: XMM-Newton observation
  51. GRB 150120A: Enhanced Swift-XRT position
  52. GRB 150120B: FTN optical afterglow confirmation
  53. GRB 150120B: P60 optical afterglow
  54. GRB 150120B: Swift detection of a burst
  55. GRB 150120A: Gemini-North optical imaging
  56. GRB 150120A: P60 optical observations
  57. GRB 150120A: Prompt enhanced Swift-XRT position
  58. GRB 150120A: Swift detection of a possibly-short burst
  59. GRB 150101B/Swift J123205.1-105602: continued WSRT radio and VLT optical observations
  60. GRB 150118B: Fermi GBM Detection
  61. GRB 150118B: Fermi-LAT detection
  62. GRB 150110B: Khureltogot optical upper limit
  63. GRB 150110C: Swift/UVOT Upper Limits
  64. GRB 150110C: Swift-XRT observations
  65. GRB 150110B: Swift-BAT refined analysis
  66. GRB 150110A: MASTER inspection
  67. GRB 150110C Tiled Swift observations
  68. GRB 150110B: Swift-XRT refined Analysis
  69. GRB 150110B: Swift/UVOT Upper Limits
  70. GRB 150110B: Fermi GBM Detection
  71. GRB 150110B: Enhanced Swift-XRT position
  72. GRB 150110C: MAXI/GSC detection
  73. GRB 150110A: Fermi GBM Detection
  74. GRB 150110B: Swift detection of a burst
  75. GRB 150110A: MAXI/GSC detection
  76. GRB 150101B/Swift J123205.1-105602: Chandra observations
  77. GRB 150101B / Swift J123205.1-105602: 9.8 GHz VLA observations
  78. Fermi GBM trigger 150108121 is not a GRB
  79. GRB 150101B/Swift J123205.1-105602: WSRT radio observation
  80. GRB 150101B / Swift J123205.1-105602: X-ray counterpart is likely an AGN
  81. Radio upper limit on the GRB 141121A with the GMRT
  82. Fermi GBM trigger 150106207 is not a GRB
  83. GRB 150105A: Fermi GBM detection
  84. GRB 150101B/Swift J123205.1-105602: VLT observations and redshift
  85. GRB 150103A: MASTER optical observations
  86. GRB 150101B: potential host galaxy redshift by GTC
  87. GRB 150103A: Swift-XRT refined Analysis
  88. GRB 150101B: Fermi GBM detection
  89. GRB 150103A: Swift/UVOT Upper Limits
  90. GRB 150103A: Swift-BAT refined analysis
  91. GRB 150103A: Zadko observatory - Gingin optical observations
  92. GRB 150103A: Enhanced Swift-XRT position
  93. Swift J123205.1-105602: Magellan candidate afterglow
  94. GRB 150103A: Prompt enhanced Swift-XRT position
  95. GRB 150103A: Swift detection of a burst
  96. Short burst found in ground analysis of Swift-BAT data
  97. GRB 150101A Swift-BAT refined analysis of the short hard burst
  98. GRB 150101A: Fermi GBM detection
  99. GRB 150101A: Swift-XRT refined Analysis
  100. GRB 150101A: Swift/UVOT Upper Limits

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