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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"

43864 results found.

  1. GRB 141118A: Fermi GBM Detection
  2. GRB 141121A: Mondy optical observations
  3. GRB 141121A: LCO-FTN rebrightening confirmation
  4. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  5. GRB 141121A: AAO optical observations
  6. GRB 141121A: Continued RATIR Optical Observations
  7. GRB 141121A: Swift-XRT refined Analysis
  8. GRB 141121A: Swift/UVOT Detections
  9. GRB 141121A: RATIR Optical Observations
  10. GRB 141121A: Swift-BAT refined analysis
  11. GRB 141121A: LCO-FTN observations
  12. GRB 141121A: Keck redshift
  13. GRB 141121A: Enhanced Swift-XRT position
  14. GRB 141118A: iPTF Optical Observations
  15. GRB 141121A: GROND Afterglow candidate
  16. GRB 141121A: MAXI/GSC detection
  17. GRB141121A: BOOTES-2/TELMA upper limit
  18. GRB 141121A: Swift detection of a burst
  19. Konus-Wind observation of GRB 141118A
  20. IPN Triangulation of GRB 141118A
  21. GRB 141109A: further VLA observations
  22. GRB 141104A: further Swift-XRT observations and afterglow candidate
  23. GRB 141109A: VLA detection
  24. Swift Trigger 618673: probable noise event
  25. Trigger 618634: Swift detection of Vela X-1
  26. GRB 141109B: optical upper limits
  27. GRB 141015A: TAROT La Silla observatory optical observations
  28. GRB 141022A: TAROT La Silla observatory optical observations
  29. GRB 141031A: TAROT La Silla observatory optical observations
  30. GRB 141109A: TAROT La Silla observatory optical observations
  31. GRB 141109A: AAO optical observations
  32. Swift Trigger 618402: probable noise event
  33. Swift Trigger 618391 is not an astrophysical event
  34. GRB 141109A: Terskol photometry
  35. GRB 141109B: Swift/UVOT Upper Limits
  36. GRB 141109A: Swift/UVOT Detection
  37. GRB 141109A: NOT r-band observation
  38. Konus-Wind observation of GRB 141109A
  39. GRB141109A : Xinglong TNT optical observation
  40. GRB 141109B: IRAM 30m millimetre observations
  41. GRB 141109B: Swift-XRT refined Analysis
  42. Swift Trigger 618134 is not an astrophysical event
  43. GRB 141109A: Swift-XRT refined Analysis
  44. GRB 141109B: BOOTES-4 and TERSKOL optical upper limit
  45. GRB 141109B: Swift-BAT refined analysis
  46. GRB 141109B: Enhanced Swift-XRT position
  47. GRB 141109A: Swift-BAT refined analysis
  48. GRB 141109A: Enhanced Swift-XRT position
  49. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  50. GRB 141109A: GROND afterglow observation
  51. X-shooter redshift of GRB 141109A
  52. GRB 141109A: REM NIR candidate afterglow
  53. GRB 141109B: Swift detection of a burst
  54. GRB 141109A: Swift detection of a burst
  55. GRB 141104A: Swift-XRT observations
  56. GRB 141028A: Mondy optical observations
  57. GRB 141104A Tiled Swift observations
  58. GRB 141026A: CrAO optical observation
  59. GRB
  60. GRB 141026A: Gemini-North optical and NIR imaging
  61. GRB 141028A: TShAO optical observation
  62. GRB 141031B: TShAO optical observations
  63. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  64. Konus-Wind observation of GRB 141104A
  65. IPN Triangulation of GRB 141104A (long/very bright)
  66. GRB 141102A possible precursor was another, known source
  67. Konus-Wind observation of GRB 141102A
  68. GRB 141022A: Skynet PROMPT-CTIO Observations
  69. GRB 141102A: Fermi-LAT detection
  70. GRB 141102A: Fermi GBM detection
  71. GRB 141102A found in ground analysis of BAT data
  72. GRB 141026A: VLA observations
  73. GRB 141031B: RATIR Optical and NIR Observation
  74. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  75. GRB 141031B: Swift-XRT refined Analysis
  76. GRB 141031B: Bassano Bresciano Observatory upper limit
  77. GRB 141031B: Swift-BAT refined analysis
  78. GRB 141031A, Swift-BAT refined analysis
  79. GRB 141031B: Enhanced Swift-XRT position
  80. GRB 141031B: TShAO optical upper limit
  81. GRB 141031B: 1.23m CAHA I-band observations
  82. GRB 141031A: Swift-XRT refined Analysis
  83. GRB 141031A: Skynet PROMPT-CTIO Observations
  84. GRB 141004A: Continued Late Time RATIR Optical and NIR Observations
  85. GRB 141031A: VLT/X-shooter optical observations
  86. GRB 141031A: Fermi GBM detection
  87. GRB 141031B: Nanshan optical upper limit
  88. GRB 141031B: MASTER early optical observations
  89. GRB 141031B: Swift detection of a burst
  90. GRB 141031A: Enhanced Swift-XRT position
  91. GRB 141031A: GROND detection of a possible optical afterglow candidate
  92. GRB 141031A: Swift detection of a burst
  93. GRB 141029A: Nanshan optical upper limit
  94. GRB 140509A: GROND afterglow detection
  95. GRB 141028A: Continued RATIR Observations
  96. GRB 141028A: Swift/UVOT followup observations
  97. GRB 141028A: P60 Observations and Decay Index
  98. IPN triangulation of GRB 141029B
  99. GRB 141029B: Fermi GBM detection
  100. GRB 141028A: Swift-XRT observations

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