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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"

27942 results found.

  1. GRB 120907A: Swift-BAT refined analysis
  2. GRB 120907A: NOT optical observations
  3. GRB 120907A MASTER optical observations
  4. GRB 120907A: ROTSE-III Optical Limits
  5. GRB 120907A: Swift detection of a burst with optical counterpart
  6. XMM observations of the short GRB120804A
  7. GRB 120830A: Further Swift Observations
  8. GRB 120830A: catalog source at Uvot position
  9. GRB 120830A: Swift-XRT and UVOT observations
  10. Konus-Wind observation of GRB 120830A
  11. IPN Triangulation of short GRB 120830A
  12. GRB 120830A: Fermi-LAT detection of a short burst
  13. GRB 120819A: Swift/UVOT Upper Limits
  14. GRB 120817A: Swift/UVOT Upper Limits
  15. GRB 120821A: Swift/XRT observations
  16. GRB 120821A: Swift/UVOT Upper Limits
  17. GRB 120821A: GROND upper limits
  18. GRB 120817B - PTF Observations
  19. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  20. GRB 120817B: BAT location in ground analysis and refined analysis
  21. GRB 120819A: Bassano Bresciano Observatory optical observations
  22. GRB 120819A: Swift-BAT refined analysis
  23. GRB 120819A: GROND afterglow confirmation
  24. GRB 120819A: Swift-XRT refined Analysis
  25. GRB 120819A: Enhanced Swift-XRT position
  26. GRB 120819A: MASTER optical observations
  27. GRB 120819A: Swift detection of a burst
  28. GRB 120817B: Swift-XRT observations
  29. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  30. GRB 120815A: MASTER-ICATE observations
  31. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  32. Konus-Wind observation of GRB 120817B
  33. GRB 120817A: Swift-XRT refined Analysis
  34. GRB 120817B: Fermi GBM detection
  35. IPN Triangulation of GRB 120817B (short/very intense)
  36. GRB 120817A: Swift-BAT refined analysis
  37. GRB 120816A: optical upper limit
  38. GRB 120817A: Enhanced Swift-XRT position
  39. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  40. GRB 120816A: Bassano Bresciano Observatory optical observations
  41. GRB 120817A: FTN and FTS observations
  42. GRB 120816A: Swift-XRT refined Analysis
  43. GRB 120817A: Swift-XRT observations
  44. GRB 120817A: Swift detection of a burst
  45. GRB 120816A: Enhanced Swift-XRT position
  46. GRB 120816A: Swift-BAT refined analysis
  47. GRB 120816A: BOOTES-2 observations
  48. GRB 120816A: TAROT Calern observatory optical observations
  49. GRB 120816A: ROTSE-III Optical Limits
  50. GRB 120816A: Swift detection of a burst
  51. GRB 120815A: Swift-XRT refined Analysis
  52. GRB 120815A: Swift-BAT refined analysis
  53. GRB 120805A: Liverpool Telescope optical candidate detection
  54. GRB 120815A: Enhanced Swift-XRT position
  55. GRB 120815A: GROND afterglow candidate
  56. GRB 120815A: Swift-XRT observations
  57. GRB 120815A: TAROT La Silla observatory optical observations
  58. GRB 120815A: Swift detection of a burst
  59. GRB 120804A: Possible temporal break in the X-ray light-curve
  60. GCN for GRB 120811C
  61. GRB 120811A: Swift/XRT-UVOT Obseravations
  62. GRB120804A: Chandra observations and afterglow detection
  63. GRB 120805A: Enhanced Swift-XRT position
  64. GRB 120811C: EVLA Observations
  65. GRB 120811C: RTT150 optical observations
  66. GRB 120811C: MASTER-Tunka OT observations
  67. GRB 120811C: Swift-BAT refined analysis
  68. GRB 120811A: Swift-BAT refined analysis
  69. GRB 120811C: Bassano Bresciano Observatory optical observations
  70. GRB 120811C: Swift-XRT refined Analysis
  71. GRB 120811C: Swift/UVOT Detection
  72. Improved IPN error box for short hard GRB 120811B
  73. GRB 120811C: RTT150 optical observations
  74. GRB 120811C: Enhanced Swift-XRT position
  75. GRB 120811C: TAROT Calern observatory optical observations
  76. GRB 120811C: Swift detection of a burst with an optical counterpart
  77. IPN Triangulation of short hard GRB 120811B
  78. Trigger 530588: Swift detection of XMM J174457-2850.3
  79. Swift Trigger 530581: GRB 120811A or a galactic transient
  80. GRB 120803A: optical upper limit
  81. GRB 120807A: Swift/UVOT Upper Limits
  82. GRB 120803A: Confirmation of the X-ray afterglow
  83. GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
  84. GRB 120714B: GROND/FORS2 detection of a supernova
  85. Swift Trigger 530441 is a false trigger
  86. GRB 120807A: Swift-XRT refined Analysis
  87. GRB 120807A: Fermi/LAT upper limit
  88. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  89. GRB 120804A: Gemini-North detection of an optical afterglow and putative host galaxy
  90. GRB 120807A: TAROT La Silla observatory optical observations
  91. GRB 120807A: Swift-BAT refined analysis
  92. GRB 120807A: Enhanced Swift-XRT position
  93. GRB 120807A: Swift detection of a burst
  94. Fermi/GBM detection of an SGR-like burst
  95. Swift-BAT trigger 530214 is noise
  96. GRB 120805A: Swift/UVOT Upper Limits
  97. Swift trigger 530214: uncertain if real or not
  98. Swift-BAT trigger 529813 is due to noise while entering the SAA
  99. GRB 120728A: Fermi GBM observation
  100. GRB 120805A: Swift-BAT refined analysis

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