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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"

28235 results found.

  1. GRB 141130A: Swift detection of a burst with an optical counterpart
  2. GRB 141121A: Continued RATIR Optical Observations
  3. GRB 141121A: Mondy optical observations
  4. GRB 141121A: TSHAO optical observations
  5. GRB 141121A: Continued RATIR Optical Observations
  6. GRB 141121A: MITSuME Ishigakijima Optical Observation after 7 days
  7. GRB 141121A: Khureltogot optical observations
  8. GRB 141121A: Mondy optical observations
  9. GRB 141121A: RATIR Optical and NIR Observations
  10. IPN Triangulation of GRB 141125A (short/hard)
  11. GRB 141121A: three epochs of SAO RAS optical observations
  12. GRB 141121A: Continued RATIR Optical Observations
  13. GRB 141121A: TSHAO optical observations
  14. GRB 141121A: Continued Mondy optical observations
  15. GRB 141121A: Continued RATIR Optical Observations
  16. GRB 141121A: RATIR Optical Observations - Steeper Fading
  17. GRB 141121A: MITSuME Ishigakijima Optical Observation after 3 days
  18. GRB 141124A​: iPTF upper limits​
  19. GRB 141121A: RATIR Optical Observations - Fading Again
  20. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  21. GRB 141118A: Fermi GBM Detection
  22. GRB 141121A: Mondy optical observations
  23. GRB 141121A: MITSuME Ishigakijima Optical Observation
  24. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  25. GRB 141121A: AAO optical observations
  26. GRB 141121A: MITSuME Akeno Optical observation
  27. GRB 141121A: Continued RATIR Optical Observations
  28. GRB 141121A: Swift-XRT refined Analysis
  29. GRB 141121A: Swift/UVOT Detections
  30. GRB 141121A: RATIR Optical Observations
  31. GRB 141121A: Swift-BAT refined analysis
  32. GRB 141121A: Enhanced Swift-XRT position
  33. GRB 141118A: iPTF Optical Observations
  34. GRB 141121A: GROND Afterglow candidate
  35. GRB 141121A: MAXI/GSC detection
  36. GRB 141121A: Swift detection of a burst
  37. IPN Triangulation of GRB 141118A
  38. GRB 141104A: further Swift-XRT observations and afterglow candidate
  39. Swift Trigger 618673: probable noise event
  40. Trigger 618634: Swift detection of Vela X-1
  41. GRB 141109B: optical upper limits
  42. GRB 141015A: TAROT La Silla observatory optical observations
  43. GRB 141022A: TAROT La Silla observatory optical observations
  44. GRB 141031A: TAROT La Silla observatory optical observations
  45. GRB 141109A: TAROT La Silla observatory optical observations
  46. GRB 141109A: AAO optical observations
  47. Swift Trigger 618402: probable noise event
  48. Swift Trigger 618391 is not an astrophysical event
  49. GRB 141109A: Terskol photometry
  50. GRB 141109B: Swift/UVOT Upper Limits
  51. GRB 141109A: Swift/UVOT Detection
  52. GRB 141109A: NOT r-band observation
  53. Konus-Wind observation of GRB 141109A
  54. GRB 141109B: MITSuME Akeno upper limits
  55. GRB 141109B: IRAM 30m millimetre observations
  56. GRB 141109B: Swift-XRT refined Analysis
  57. Swift Trigger 618134 is not an astrophysical event
  58. GRB 141109A: MITSuME Ishigakijima upper limits
  59. GRB 141109A: Swift-XRT refined Analysis
  60. GRB 141109B: Swift-BAT refined analysis
  61. GRB 141109B: Enhanced Swift-XRT position
  62. GRB 141109A: Swift-BAT refined analysis
  63. GRB 141109A: Enhanced Swift-XRT position
  64. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  65. GRB 141109A: GROND afterglow observation
  66. GRB 141109A: REM NIR candidate afterglow
  67. GRB 141109B: Swift detection of a burst
  68. GRB 141109A: Swift detection of a burst
  69. GRB 141104A: Swift-XRT observations
  70. GRB 141028A: Mondy optical observations
  71. GRB 141026A: CrAO optical observation
  72. GRB
  73. GRB 141028A: TShAO optical observation
  74. GRB 141031B: TShAO optical observations
  75. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  76. IPN Triangulation of GRB 141104A (long/very bright)
  77. Konus-Wind observation of GRB 141102A
  78. GRB 141022A: Skynet PROMPT-CTIO Observations
  79. GRB 141102A: Fermi GBM detection
  80. GRB 141031B: RATIR Optical and NIR Observation
  81. GRB 141031B: Swift/UVOT Upper Limits
  82. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  83. GRB 141031B: Swift-XRT refined Analysis
  84. GRB 141031B: Bassano Bresciano Observatory upper limit
  85. GRB 141031B: NOT optical observations
  86. GRB 141031B: MITSuME Ishigakijima upper limits
  87. GRB 141031B: Swift-BAT refined analysis
  88. GRB 141031A, Swift-BAT refined analysis
  89. GRB 141031B: Enhanced Swift-XRT position
  90. GRB 141031A: Swift/UVOT Upper Limits
  91. GRB 141031B: TShAO optical upper limit
  92. GRB 141031B: 1.23m CAHA I-band observations
  93. GRB 141031A: Swift-XRT refined Analysis
  94. GRB 141031A: Skynet PROMPT-CTIO Observations
  95. GRB 141004A: Continued Late Time RATIR Optical and NIR Observations
  96. GRB 141031A: VLT/X-shooter optical observations
  97. GRB 141031A: Fermi GBM detection
  98. GRB 141031B: Nanshan optical upper limit
  99. GRB 141031B: Swift detection of a burst
  100. GRB 141031A: Enhanced Swift-XRT position

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