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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"
  1. GRB 120923A: ROTSE-III Optical Limits
  2. GRB 120923A: Swift detection of a burst
  3. GRB 120922A: GROND afterglow candidate
  4. GRB 120922A: Prompt enhanced Swift-XRT position
  5. GRB 120922A: Swift detection of a burst
  6. GRB 120919B: MASTER prompt optical observations
  7. GRB 120919A: Swift/UVOT Upper Limits
  8. GRB 120919A: Swift-XRT observations
  9. Konus-Wind observation of GRB 120919B
  10. IPN Triangulation of long GRB 120919B
  11. Konus-Wind observation of GRB 120919A
  12. IPN Triangulation of long GRB 120919A
  13. GRB 120919A: Fermi GBM detection
  14. GRB 120918A: Swift-BAT refined analysis
  15. Swift trigger 534017 was not an astrophysical event
  16. GRB 120916A: Fermi GBM Observation
  17. Konus-Wind observation of GRB 120916A
  18. Swift Trigger 534017 is probably not real.
  19. GRB 120918A: Swift detection of a burst
  20. IPN Triangulation of long GRB 120916A
  21. GRB 120916A: Fermi-LAT detection of a burst
  22. Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A
  23. Swift Transient Swift J174510.8-262411: Swift-BAT refined analysis
  24. Swift Trigger 533836 is a new Galactic transient
  25. GRB 120913B: Fermi GBM observation
  26. GRB 120913B: Swift-BAT refined analysis
  27. GRB 120913A: Fermi GBM observation
  28. GRB 120913B: FRAM early follow up and detection
  29. GRB 120913A: Swift-BAT refined analysis
  30. GRB 120913B: REM NIR early time detection
  31. Continued Skynet/PROMPT observations of GRB120913B
  32. GRB 120913B: TAROT La Silla observatory optical photometry
  33. GRB 120913B: TAROT La Silla observatory optical detection
  34. Skynet/PROMPT observations of GRB120913B
  35. GRB 120913B: Swift detection of a burst
  36. GRB 120913A: Swift detection of a burst
  37. GRB 120907A: optical observations of ISON-Kislovodsk
  38. GRB 120911A: optical upper limit CrAO
  39. GRB 120911A: optical upper limit ISON-NM
  40. Konus-Wind observation of GRB 120911B
  41. GRB 120911B: Fermi GBM observation
  42. GRB 120911B: Fermi-LAT detection of a burst
  43. IPN Triangulation of GRB 120911B (long/bright)
  44. GRB 120911A: Fermi GBM observation
  45. GRB120911A: MITSuME Okayama Optical upper limits
  46. GRB 120911A: Fermi/LAT upper limit
  47. GRB 120911A: Swift/UVOT Upper Limits
  48. GRB 120911A: Swift-XRT refined Analysis
  49. GRB 120911A: Swift-BAT refined analysis
  50. GRB 120911A: Enhanced Swift-XRT position
  51. GRB 120911A: Faulkes Telescope North observations
  52. GRB 120911A: Swift-XRT observations
  53. GRB 120911A: ROTSE-III Optical Limits
  54. GRB 120911A: Swift detection of a burst
  55. GRB 120907A: SMA upper limits
  56. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  57. GRB 120908A: Fermi GBM detection
  58. GRB 120908A: Swift Observations
  59. GRB 120909A: TAROT La Silla observatory optical observations
  60. GRB 120909A: Pi of the Sky upper limits
  61. GRB 120909A: Fermi GBM observation
  62. Konus-Wind observation of GRB 120909A
  63. GRB 120909A: Swift/UVOT Detection
  64. GRB 120909A: Swift-XRT refined Analysis
  65. GRB 120909A: Swift-BAT refined analysis
  66. GRB 120909A: Enhanced Swift-XRT position
  67. GRB 120908A: MAXI/GSC detection
  68. GRB 120909A: X-Shooter redshift 3.93
  69. GRB 120909A: GROND detection of the afterglow
  70. Skynet/PROMPT Observations of GRB120909A
  71. GRB 120909A: Swift detection of a burst
  72. GRB 120907A: EVLA observations
  73. GRB 120907A: Swift/UVOT Detection
  74. GRB 120907A: Swift-XRT refined Analysis
  75. GRB 120907A: Spectroscopy from OSIRIS/GTC
  76. GRB 120907A: Enhanced Swift-XRT position
  77. GRB 120907A: Fermi GBM detection
  78. GRB 120907A: Swift-BAT refined analysis
  79. GRB 120907A: NOT optical observations
  80. GRB 120907A MASTER optical observations
  81. GRB 120907A: ROTSE-III Optical Limits
  82. GRB 120907A: Swift detection of a burst with optical counterpart
  83. XMM observations of the short GRB120804A
  84. GRB 120819A: optical upper limit
  85. GRB 120802A: optical observations in CrAO
  86. GRB 120830A: Further Swift Observations
  87. GRB 120830A: catalog source at Uvot position
  88. GRB 120830A: Swift-XRT and UVOT observations
  89. GRB 120830A: Fermi GBM observation
  90. Konus-Wind observation of GRB 120830A
  91. GRB 120830A: early MASTER optical limit
  92. IPN Triangulation of short GRB 120830A
  93. GRB 120830A: Fermi-LAT detection of a short burst
  94. Fermi trigger 368003226 : MASTER optical observations
  95. GRB 120819A: Swift/UVOT Upper Limits
  96. GRB 120817A: Swift/UVOT Upper Limits
  97. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  98. GRB 120821A: Swift/XRT observations
  99. GRB 120821A: Swift/UVOT Upper Limits
  100. GRB 120821A: GROND upper limits

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