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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"

43701 results found.

  1. GRB 141202A: Fermi GBM Detection
  2. GRB 141202A Tiled Swift observations
  3. IPN Triangulation of GRB 141202A (short/hard)
  4. GRB 141130A: Mondy optical light curve
  5. GRB 141030A: Nanshan very early optical observations
  6. GRB 141121A: Continued RATIR Optical Observations
  7. GRB 141130A: Swift-BAT refined analysis
  8. GRB 141130A: Swift/UVOT Detection
  9. GRB 141130A: Swift-XRT refined Analysis
  10. GRB 141121A: VLA radio detection
  11. GRB 141130A: Enhanced Swift-XRT position
  12. GRB 141130A: Nanshan optical observations
  13. GRB 141130A: Mondy optical observations
  14. GRB 141130A: Swift detection of a burst with an optical counterpart
  15. GRB 141121A: Continued RATIR Optical Observations
  16. GRB 141121A: Mondy optical observations
  17. GRB 141121A: TSHAO optical observations
  18. GRB 141121A: Continued RATIR Optical Observations
  19. GRB 141121A: RATIR Optical Observations - Errata for GCN 17105
  20. GRB 141121A: Khureltogot optical observations
  21. IPN Triangulation of GRB 141121A (initial episode)
  22. GRB 141121A: Mondy optical observations
  23. GRB 141121A: SPI-ACS/INTEGRAL observations
  24. GRB 141121A: RATIR Optical and NIR Observations
  25. Konus-Wind observation of GRB 141121A
  26. IPN Triangulation of GRB 141125A (short/hard)
  27. GRB 141121A: three epochs of SAO RAS optical observations
  28. GRB 141121A: Continued RATIR Optical Observations
  29. GRB 141121A: WSRT radio detection
  30. GRB 141121A: TSHAO optical observations
  31. GRB 141121A: Continued Mondy optical observations
  32. GRB 141121A: Continued RATIR Optical Observations
  33. GRB 141121A: RATIR Optical Observations - Steeper Fading
  34. GRB 141121A: AMI 15 GHz detection
  35. GRB 141124A​: iPTF upper limits​
  36. GRB 141121A: RATIR Optical Observations - Fading Again
  37. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  38. GRB 141118A: Fermi GBM Detection
  39. GRB 141121A: Mondy optical observations
  40. GRB 141121A: LCO-FTN rebrightening confirmation
  41. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  42. GRB 141121A: AAO optical observations
  43. GRB 141121A: Continued RATIR Optical Observations
  44. GRB 141121A: Swift-XRT refined Analysis
  45. GRB 141121A: Swift/UVOT Detections
  46. GRB 141121A: RATIR Optical Observations
  47. GRB 141121A: Swift-BAT refined analysis
  48. GRB 141121A: LCO-FTN observations
  49. GRB 141121A: Keck redshift
  50. GRB 141121A: Enhanced Swift-XRT position
  51. GRB 141118A: iPTF Optical Observations
  52. GRB 141121A: GROND Afterglow candidate
  53. GRB 141121A: MAXI/GSC detection
  54. GRB141121A: BOOTES-2/TELMA upper limit
  55. GRB 141121A: Swift detection of a burst
  56. Konus-Wind observation of GRB 141118A
  57. IPN Triangulation of GRB 141118A
  58. GRB 141109A: further VLA observations
  59. GRB 141104A: further Swift-XRT observations and afterglow candidate
  60. GRB 141109A: VLA detection
  61. Swift Trigger 618673: probable noise event
  62. Trigger 618634: Swift detection of Vela X-1
  63. GRB 141109B: optical upper limits
  64. GRB 141015A: TAROT La Silla observatory optical observations
  65. GRB 141022A: TAROT La Silla observatory optical observations
  66. GRB 141031A: TAROT La Silla observatory optical observations
  67. GRB 141109A: TAROT La Silla observatory optical observations
  68. GRB 141109A: AAO optical observations
  69. Swift Trigger 618402: probable noise event
  70. Swift Trigger 618391 is not an astrophysical event
  71. GRB 141109A: Terskol photometry
  72. GRB 141109B: Swift/UVOT Upper Limits
  73. GRB 141109A: Swift/UVOT Detection
  74. GRB 141109A: NOT r-band observation
  75. Konus-Wind observation of GRB 141109A
  76. GRB141109A : Xinglong TNT optical observation
  77. GRB 141109B: IRAM 30m millimetre observations
  78. GRB 141109B: Swift-XRT refined Analysis
  79. Swift Trigger 618134 is not an astrophysical event
  80. GRB 141109A: Swift-XRT refined Analysis
  81. GRB 141109B: BOOTES-4 and TERSKOL optical upper limit
  82. GRB 141109B: Swift-BAT refined analysis
  83. GRB 141109B: Enhanced Swift-XRT position
  84. GRB 141109A: Swift-BAT refined analysis
  85. GRB 141109A: Enhanced Swift-XRT position
  86. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  87. GRB 141109A: GROND afterglow observation
  88. X-shooter redshift of GRB 141109A
  89. GRB 141109A: REM NIR candidate afterglow
  90. GRB 141109B: Swift detection of a burst
  91. GRB 141109A: Swift detection of a burst
  92. GRB 141104A: Swift-XRT observations
  93. GRB 141028A: Mondy optical observations
  94. GRB 141104A Tiled Swift observations
  95. GRB 141026A: CrAO optical observation
  96. GRB
  97. GRB 141026A: Gemini-North optical and NIR imaging
  98. GRB 141028A: TShAO optical observation
  99. GRB 141031B: TShAO optical observations
  100. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations

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