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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"

19663 results found.

  1. GRB 121001A: possible optical counterpart
  2. Swift Trigger 535026: ROTSE-III Optical Limits
  3. Swift Trigger 535026: Galactic Transient or possible GRB
  4. GRB 120927A: Swift/UVOT Upper Limits
  5. GRB 120927A, Swift-BAT refined analysis
  6. GRB 120927A: GROND upper limits
  7. GRB 120927A: Swift-XRT refined Analysis
  8. GRB 120927A: Enhanced Swift-XRT position
  9. GRB 120927A: Swift detection of a burst
  10. Further Swift-XRT observations of the GRB 120919A field.
  11. GRB 120923A: optical upper limit
  12. GRB 120923A: RAPTOR Early Afterglow Limits
  13. GRB 120916A Suzaku WAM observation of the prompt emission
  14. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  15. GRB 120923A: CARMA Observations
  16. GRB 120923A: EVLA Observations
  17. GRB 120923A: Swift-XRT refined Analysis
  18. GRB 120923A: GROND Upper limits
  19. GRB 120922A: Fermi GBM detection
  20. GRB 120922A: Swift/UVOT Detection
  21. GRB 120923A: Swift-BAT refined analysis
  22. GRB 120922A: Swift-BAT refined analysis
  23. GRB 120923A: Swift/UVOT Upper Limit
  24. GRB 120922A: Swift-XRT refined Analysis
  25. GRB 120922A: Swift/UVOT Observations
  26. GRB 120923A: Enhanced Swift-XRT position
  27. GRB 120922A: Enhanced Swift-XRT position
  28. GRB 120922A: TAROT La Silla observatory optical observations
  29. GRB 120923A: TAROT La Silla observatory optical observations
  30. GRB 120923A: ROTSE-III Optical Limits
  31. GRB 120923A: Swift detection of a burst
  32. GRB 120922A: GROND afterglow candidate
  33. GRB 120922A: Prompt enhanced Swift-XRT position
  34. GRB 120922A: Swift detection of a burst
  35. GRB 120919A: Swift/UVOT Upper Limits
  36. GRB 120919A: Swift-XRT observations
  37. GRB 120918A: Swift-BAT refined analysis
  38. Swift trigger 534017 was not an astrophysical event
  39. Swift Trigger 534017 is probably not real.
  40. GRB 120918A: Swift detection of a burst
  41. IPN Triangulation of long GRB 120916A
  42. Swift Transient Swift J174510.8-262411: Swift-BAT refined analysis
  43. Swift Trigger 533836 is a new Galactic transient
  44. GRB 120913B: Fermi GBM observation
  45. GRB 120913B: Swift-BAT refined analysis
  46. GRB 120913A: Fermi GBM observation
  47. GRB 120913B: FRAM early follow up and detection
  48. GRB 120913A: Swift-BAT refined analysis
  49. Continued Skynet/PROMPT observations of GRB120913B
  50. GRB 120913B: TAROT La Silla observatory optical detection
  51. Skynet/PROMPT observations of GRB120913B
  52. GRB 120913B: Swift detection of a burst
  53. GRB 120913A: Swift detection of a burst
  54. GRB 120911A: optical upper limit CrAO
  55. GRB 120911A: optical upper limit ISON-NM
  56. GRB 120911A: Fermi GBM observation
  57. GRB 120911A: Fermi/LAT upper limit
  58. GRB 120911A: Swift/UVOT Upper Limits
  59. GRB 120911A: Swift-XRT refined Analysis
  60. GRB 120911A: Swift-BAT refined analysis
  61. GRB 120911A: Enhanced Swift-XRT position
  62. GRB 120911A: Swift-XRT observations
  63. GRB 120911A: ROTSE-III Optical Limits
  64. GRB 120911A: Swift detection of a burst
  65. GRB 120907A: SMA upper limits
  66. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  67. GRB 120908A: Swift Observations
  68. GRB 120909A: TAROT La Silla observatory optical observations
  69. GRB 120909A: Pi of the Sky upper limits
  70. GRB 120909A: Fermi GBM observation
  71. Konus-Wind observation of GRB 120909A
  72. GRB 120909A: Swift/UVOT Detection
  73. GRB 120909A: Swift-XRT refined Analysis
  74. GRB 120909A: Swift-BAT refined analysis
  75. GRB 120909A: Enhanced Swift-XRT position
  76. GRB 120909A: GROND detection of the afterglow
  77. Skynet/PROMPT Observations of GRB120909A
  78. GRB 120909A: Swift detection of a burst
  79. GRB 120907A: EVLA observations
  80. GRB 120907A: Swift/UVOT Detection
  81. GRB 120907A: Swift-XRT refined Analysis
  82. GRB 120907A: Enhanced Swift-XRT position
  83. GRB 120907A: Fermi GBM detection
  84. GRB 120907A: Swift-BAT refined analysis
  85. GRB 120907A: NOT optical observations
  86. GRB 120907A MASTER optical observations
  87. GRB 120907A: ROTSE-III Optical Limits
  88. GRB 120907A: Swift detection of a burst with optical counterpart
  89. XMM observations of the short GRB120804A
  90. GRB 120830A: Further Swift Observations
  91. GRB 120830A: catalog source at Uvot position
  92. GRB 120830A: Swift-XRT and UVOT observations
  93. IPN Triangulation of short GRB 120830A
  94. GRB 120830A: Fermi-LAT detection of a short burst
  95. GRB 120819A: Swift/UVOT Upper Limits
  96. GRB 120817A: Swift/UVOT Upper Limits
  97. GRB 120821A: Swift/XRT observations
  98. GRB 120821A: Swift/UVOT Upper Limits
  99. GRB 120821A: GROND upper limits
  100. GRB 120817B - PTF Observations

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