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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"

37333 results found.

  1. GRB 121017A: GROND Observations
  2. GRB 121017A: Swift-BAT refined analysis
  3. GRB 121017A: Enhanced Swift-XRT position
  4. GRB 121017A: 1.23m CAHA R-band observations
  5. GRB 121017A optical observations
  6. GRB 121017A: BOOTES-2/TELMA observations
  7. GRB 121017A: Swift detection of a burst
  8. GRB 121011B: Suzaku WAM observation of the prompt emission
  9. GRB 121011A Suzaku WAM observation of the prompt emission
  10. GRB 121012A: Fermi GBM detection
  11. PdB IRAM observation of GRB 121011A
  12. Konus-Wind observation of GRB 121011B
  13. GRB 121014A: Swift-BAT refined analysis
  14. GRB 121011A: WSRT radio observation
  15. GRB 121014A: Swift detection of a burst
  16. INTEGRAL Alert n.6678: NOT A GRB
  17. GRB 121011A: optical observations
  18. GRB 121011A: Swift/UVOT Detection
  19. IPN Triangulation of short hard GRB 121011B
  20. GRB 121011A: NOT redshift retraction
  21. GRB 121011A: misprint in GCNC 13854
  22. GRB 121011A: Fermi GBM observation
  23. GRB 121011A: Fermi-LAT detection of a burst
  24. GRB 121011A: Swift-XRT refined Analysis
  25. GRB 121011A: NOT optical observations
  26. GRB 121011A: optical observations
  27. GRB 121011A: MASTER-Net bell light curve
  28. GRB 121011A: TNG optical observations
  29. GRB 121011A, Swift-BAT refined analysis
  30. GRB 121011A: Enhanced Swift-XRT position
  31. Planned XMM-Newton and IRAM observation of GRB 121011A
  32. GRB 121011A: MASTER-Net early OT light curve
  33. GRB 121011A: MITSuME Okayama Optical Observation
  34. GRB 121011A: Swift detection of a burst with optical afterglow
  35. GRB 120927A: optical upper limit
  36. GRB 120804A: Late-time Chandra observation
  37. GRB 121001A: GROND Afterglow Confirmation
  38. GRB 121001A: Swift/UVOT Upper Limits
  39. GRB 121001A: Swift-XRT refined Analysis
  40. GRB 121001A: Enhanced Swift-XRT Position
  41. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  42. GRB 121001A: MASTER optical observations
  43. GRB 121001A: possible optical counterpart
  44. Swift Trigger 535026: ROTSE-III Optical Limits
  45. Swift Trigger 535026: Galactic Transient or possible GRB
  46. GRB 120927A: Swift/UVOT Upper Limits
  47. GRB 120927A, Swift-BAT refined analysis
  48. GRB 120927A: GROND upper limits
  49. GRB 120927A: Swift-XRT refined Analysis
  50. GRB 120923A: Correction to GCN 13823
  51. GRB 120927A: Enhanced Swift-XRT position
  52. GRB 120923A: JHK Observation
  53. GRB 120927A: Swift detection of a burst
  54. Further Swift-XRT observations of the GRB 120919A field.
  55. GRB 120923A: optical upper limit
  56. GRB 120921A: Fermi GBM detection of its 1000th GRB
  57. GRB 120923A: RAPTOR Early Afterglow Limits
  58. GRB 120923A: MITSuME Okayama Optical upper limits
  59. GRB 120916A Suzaku WAM observation of the prompt emission
  60. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  61. GRB 120923A: CARMA Observations
  62. GRB 120923A: EVLA Observations
  63. GRB 120923A: Swift-XRT refined Analysis
  64. GRB 120923A: GROND Upper limits
  65. GRB 120922A: GROND photometric redshift
  66. GRB 120922A: Fermi GBM detection
  67. GRB 120922A: Swift/UVOT Detection
  68. GRB 120923A: Swift-BAT refined analysis
  69. GRB 120922A: Swift-BAT refined analysis
  70. GRB 120923A: Swift/UVOT Upper Limit
  71. GRB 120922A: Swift-XRT refined Analysis
  72. GRB 120922A: Swift/UVOT Observations
  73. GRB 120923A: Gemini afterglow detection, high-z candidate
  74. GRB 120923A: Enhanced Swift-XRT position
  75. GRB 120922A: Enhanced Swift-XRT position
  76. GRB 120922A: TAROT La Silla observatory optical observations
  77. GRB 120923A: TAROT La Silla observatory optical observations
  78. GRB 120923A: ROTSE-III Optical Limits
  79. GRB 120923A: Swift detection of a burst
  80. GRB 120922A: GROND afterglow candidate
  81. GRB 120922A: Prompt enhanced Swift-XRT position
  82. GRB 120922A: Swift detection of a burst
  83. GRB 120919B: MASTER prompt optical observations
  84. GRB 120919A: Swift/UVOT Upper Limits
  85. GRB 120919A: Swift-XRT observations
  86. Konus-Wind observation of GRB 120919B
  87. IPN Triangulation of long GRB 120919B
  88. Konus-Wind observation of GRB 120919A
  89. IPN Triangulation of long GRB 120919A
  90. GRB 120919A: Fermi GBM detection
  91. GRB 120918A: Swift-BAT refined analysis
  92. GRB 120916A: Fermi GBM Observation
  93. Konus-Wind observation of GRB 120916A
  94. GRB 120918A: Swift detection of a burst
  95. IPN Triangulation of long GRB 120916A
  96. GRB 120916A: Fermi-LAT detection of a burst
  97. Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A
  98. GRB 120913B: Fermi GBM observation
  99. GRB 120913B: Swift-BAT refined analysis
  100. GRB 120913A: Fermi GBM observation

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