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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"

27593 results found.

  1. GRB 141207A: Fermi GBM detection
  2. Konus-Wind observation of GRB 141130A
  3. GRB 141207A: Fermi-LAT Detection
  4. GRB141121A: Discovery Channel Telescope Optical Observations
  5. GRB 141205A: Swift/UVOT Upper Limits
  6. GRB 141205A: Fermi GBM detection
  7. GRB 141205A: Nanshan optical upper limit
  8. GRB 141205A Swift-BAT refined analysis
  9. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  10. GRB 141205A Short hard GRB found in ground analysis of BAT data
  11. GRB 141202A: Swift XRT observations
  12. GRB 141202A: Fermi GBM Detection
  13. IPN Triangulation of GRB 141202A (short/hard)
  14. GRB 141121A: Continued RATIR Optical Observations
  15. GRB 141130A: Swift-BAT refined analysis
  16. GRB 141130A: Swift/UVOT Detection
  17. GRB 141130A: Swift-XRT refined Analysis
  18. GRB 141130A: Mondy optical observations
  19. GRB 141130A: Swift detection of a burst with an optical counterpart
  20. GRB 141121A: Continued RATIR Optical Observations
  21. GRB 141121A: Continued RATIR Optical Observations
  22. IPN Triangulation of GRB 141121A (initial episode)
  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: Continued RATIR Optical Observations
  28. GRB 141121A: Continued Mondy optical observations
  29. GRB 141121A: Continued RATIR Optical Observations
  30. GRB 141121A: RATIR Optical Observations - Steeper Fading
  31. GRB 141124A​: iPTF upper limits​
  32. GRB 141121A: RATIR Optical Observations - Fading Again
  33. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  34. GRB 141118A: Fermi GBM Detection
  35. GRB 141121A: LCO-FTN rebrightening confirmation
  36. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  37. GRB 141121A: Continued RATIR Optical Observations
  38. GRB 141121A: Swift-XRT refined Analysis
  39. GRB 141121A: Swift/UVOT Detections
  40. GRB 141121A: RATIR Optical Observations
  41. GRB 141121A: Swift-BAT refined analysis
  42. GRB 141121A: LCO-FTN observations
  43. GRB 141118A: iPTF Optical Observations
  44. GRB 141121A: GROND Afterglow candidate
  45. GRB 141121A: MAXI/GSC detection
  46. GRB 141121A: Swift detection of a burst
  47. IPN Triangulation of GRB 141118A
  48. GRB 141109A: further VLA observations
  49. GRB 141104A: further Swift-XRT observations and afterglow candidate
  50. Swift Trigger 618673: probable noise event
  51. Trigger 618634: Swift detection of Vela X-1
  52. GRB 141015A: TAROT La Silla observatory optical observations
  53. GRB 141022A: TAROT La Silla observatory optical observations
  54. GRB 141031A: TAROT La Silla observatory optical observations
  55. GRB 141109A: TAROT La Silla observatory optical observations
  56. Swift Trigger 618402: probable noise event
  57. Swift Trigger 618391 is not an astrophysical event
  58. GRB 141109A: Terskol photometry
  59. GRB 141109B: Swift/UVOT Upper Limits
  60. GRB 141109A: Swift/UVOT Detection
  61. Konus-Wind observation of GRB 141109A
  62. GRB 141109B: Swift-XRT refined Analysis
  63. Swift Trigger 618134 is not an astrophysical event
  64. GRB 141109A: Swift-XRT refined Analysis
  65. GRB 141109B: BOOTES-4 and TERSKOL optical upper limit
  66. GRB 141109B: Swift-BAT refined analysis
  67. GRB 141109A: Swift-BAT refined analysis
  68. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  69. GRB 141109A: GROND afterglow observation
  70. GRB 141109B: Swift detection of a burst
  71. GRB 141109A: Swift detection of a burst
  72. GRB 141104A: Swift-XRT observations
  73. GRB 141026A: Gemini-North optical and NIR imaging
  74. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  75. IPN Triangulation of GRB 141104A (long/very bright)
  76. GRB 141102A possible precursor was another, known source
  77. Konus-Wind observation of GRB 141102A
  78. GRB 141022A: Skynet PROMPT-CTIO Observations
  79. GRB 141102A: Fermi-LAT detection
  80. GRB 141102A: Fermi GBM detection
  81. GRB 141102A found in ground analysis of BAT data
  82. GRB 141031B: RATIR Optical and NIR Observation
  83. GRB 141031B: Swift/UVOT Upper Limits
  84. GRB 141031B: Swift-XRT refined Analysis
  85. GRB 141031B: Bassano Bresciano Observatory upper limit
  86. GRB 141031B: Swift-BAT refined analysis
  87. GRB 141031A, Swift-BAT refined analysis
  88. GRB 141031A: Swift/UVOT Upper Limits
  89. GRB 141031B: TShAO optical upper limit
  90. GRB 141031A: Swift-XRT refined Analysis
  91. GRB 141031A: Skynet PROMPT-CTIO Observations
  92. GRB 141004A: Continued Late Time RATIR Optical and NIR Observations
  93. GRB 141031A: Fermi GBM detection
  94. GRB 141031B: MASTER early optical observations
  95. GRB 141031B: Swift detection of a burst
  96. GRB 141031A: GROND detection of a possible optical afterglow candidate
  97. GRB 141031A: Swift detection of a burst
  98. GRB 141029A: Nanshan optical upper limit
  99. GRB 141028A: SAO RAS Zeiss-1000 photometry
  100. GRB 140509A: GROND afterglow detection

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