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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"

27604 results found.

  1. Swift-BAT trigger 536502 is not astrophysical
  2. GRB 121024A: Swift/UVOT Observations
  3. GRB 121024A: Swift-BAT refined analysis
  4. GRB 121024A: GMG optical observation
  5. GRB 121024A: PAIRITEL NIR Detection
  6. GRB 121024A: Swift-XRT refined Analysis
  7. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  8. Skynet PROMPT/Dolomiti observations of GRB121024A
  9. GRB 121024A: BOOTES-1B optical detection
  10. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  11. GRB 121024A: Swift detection of a burst with an optical counterpart
  12. Swift Trigger 536502 is likely a noise fluctuation in coincidence with SAX J1818.6-1703
  13. GRB 121017A: Swift/UVOT Upper Limits
  14. GRB 121017A: Swift-XRT refined Analysis
  15. GRB 121017A: GROND Observations
  16. GRB 121017A: Swift-BAT refined analysis
  17. GRB 121017A optical observations
  18. GRB 121017A: BOOTES-2/TELMA observations
  19. GRB 121017A: Swift detection of a burst
  20. GRB 121011A Suzaku WAM observation of the prompt emission
  21. GRB 121012A: Fermi GBM detection
  22. PdB IRAM observation of GRB 121011A
  23. GRB 121014A: Swift-BAT refined analysis
  24. GRB 121014A: Swift detection of a burst
  25. INTEGRAL Alert n.6678: NOT A GRB
  26. GRB 121011A: Swift/UVOT Detection
  27. GRB 121011A: misprint in GCNC 13854
  28. GRB 121011A: Fermi GBM observation
  29. GRB 121011A: Fermi-LAT detection of a burst
  30. Swift-BAT trigger 535733 is not astrophysical
  31. GRB 121011A: Swift-XRT refined Analysis
  32. GRB 121011A: NOT optical observations
  33. GRB 121011A: optical observations
  34. GRB 121011A: MASTER-Net bell light curve
  35. GRB 121011A, Swift-BAT refined analysis
  36. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  37. GRB 121011A: Swift detection of a burst with optical afterglow
  38. Trigger 535747: Swift detection of an outburst from SGR1806-20
  39. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  40. GRB 120804A: Late-time Chandra observation
  41. GRB 121001A: GROND Afterglow Confirmation
  42. GRB 121001A: Swift/UVOT Upper Limits
  43. GRB 121001A: Swift-XRT refined Analysis
  44. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  45. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  46. GRB 121001A: possible optical counterpart
  47. Swift Trigger 535026: ROTSE-III Optical Limits
  48. Swift Trigger 535026: Galactic Transient or possible GRB
  49. GRB 120927A: Swift/UVOT Upper Limits
  50. GRB 120927A, Swift-BAT refined analysis
  51. GRB 120927A: GROND upper limits
  52. GRB 120927A: Swift-XRT refined Analysis
  53. GRB 120923A: JHK Observation
  54. GRB 120927A: Swift detection of a burst
  55. Further Swift-XRT observations of the GRB 120919A field.
  56. GRB 120923A: optical upper limit
  57. GRB 120921A: Fermi GBM detection of its 1000th GRB
  58. GRB 120923A: RAPTOR Early Afterglow Limits
  59. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  60. GRB 120923A: Swift-XRT refined Analysis
  61. GRB 120923A: GROND Upper limits
  62. GRB 120922A: GROND photometric redshift
  63. GRB 120922A: Fermi GBM detection
  64. GRB 120922A: Swift/UVOT Detection
  65. GRB 120923A: Swift-BAT refined analysis
  66. GRB 120922A: Swift-BAT refined analysis
  67. GRB 120923A: Swift/UVOT Upper Limit
  68. GRB 120922A: Swift-XRT refined Analysis
  69. GRB 120922A: Swift/UVOT Observations
  70. GRB 120922A: TAROT La Silla observatory optical observations
  71. GRB 120923A: TAROT La Silla observatory optical observations
  72. GRB 120923A: ROTSE-III Optical Limits
  73. GRB 120923A: Swift detection of a burst
  74. GRB 120922A: GROND afterglow candidate
  75. GRB 120922A: Swift detection of a burst
  76. GRB 120919B: MASTER prompt optical observations
  77. GRB 120919A: Swift/UVOT Upper Limits
  78. GRB 120919A: Swift-XRT observations
  79. IPN Triangulation of long GRB 120919B
  80. GRB 120919A: Fermi GBM detection
  81. GRB 120918A: Swift-BAT refined analysis
  82. Swift trigger 534017 was not an astrophysical event
  83. GRB 120916A: Fermi GBM Observation
  84. Swift Trigger 534017 is probably not real.
  85. GRB 120918A: Swift detection of a burst
  86. IPN Triangulation of long GRB 120916A
  87. GRB 120916A: Fermi-LAT detection of a burst
  88. Swift Transient Swift J174510.8-262411: Swift-BAT refined analysis
  89. Swift Trigger 533836 is a new Galactic transient
  90. GRB 120913B: Fermi GBM observation
  91. GRB 120913B: Swift-BAT refined analysis
  92. GRB 120913A: Fermi GBM observation
  93. GRB 120913B: FRAM early follow up and detection
  94. GRB 120913A: Swift-BAT refined analysis
  95. Continued Skynet/PROMPT observations of GRB120913B
  96. GRB 120913B: TAROT La Silla observatory optical detection
  97. Skynet/PROMPT observations of GRB120913B
  98. GRB 120913B: Swift detection of a burst
  99. GRB 120913A: Swift detection of a burst
  100. GRB 120907A: optical observations of ISON-Kislovodsk

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