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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"

19665 results found.

  1. GRB 120817B: BAT location in ground analysis and refined analysis
  2. GRB 120819A: Bassano Bresciano Observatory optical observations
  3. GRB 120819A: Swift-BAT refined analysis
  4. GRB 120819A: GROND afterglow confirmation
  5. GRB 120819A: Swift-XRT refined Analysis
  6. GRB 120819A: Enhanced Swift-XRT position
  7. GRB 120819A: MASTER optical observations
  8. GRB 120819A: Swift detection of a burst
  9. GRB 120817B: Swift-XRT observations
  10. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  11. GRB 120815A: MASTER-ICATE observations
  12. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  13. GRB 120817A: Swift-XRT refined Analysis
  14. IPN Triangulation of GRB 120817B (short/very intense)
  15. GRB 120817A: Swift-BAT refined analysis
  16. GRB 120816A: optical upper limit
  17. GRB 120817A: Enhanced Swift-XRT position
  18. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  19. GRB 120816A: Bassano Bresciano Observatory optical observations
  20. GRB 120816A: Swift-XRT refined Analysis
  21. GRB 120817A: Swift-XRT observations
  22. GRB 120817A: Swift detection of a burst
  23. GRB 120816A: Enhanced Swift-XRT position
  24. GRB 120816A: Swift-BAT refined analysis
  25. GRB 120816A: TAROT Calern observatory optical observations
  26. GRB 120816A: ROTSE-III Optical Limits
  27. GRB 120816A: Swift detection of a burst
  28. GRB 120815A: Swift-XRT refined Analysis
  29. GRB 120815A: Swift-BAT refined analysis
  30. GRB 120815A: Enhanced Swift-XRT position
  31. GRB 120815A: GROND afterglow candidate
  32. GRB 120815A: Swift-XRT observations
  33. GRB 120815A: TAROT La Silla observatory optical observations
  34. GRB 120815A: Swift detection of a burst
  35. GRB 120804A: Possible temporal break in the X-ray light-curve
  36. GCN for GRB 120811C
  37. GRB 120811A: Swift/XRT-UVOT Obseravations
  38. GRB120804A: Chandra observations and afterglow detection
  39. GRB 120805A: Enhanced Swift-XRT position
  40. GRB 120811C: EVLA Observations
  41. GRB 120811C: RTT150 optical observations
  42. GRB 120811C: MASTER-Tunka OT observations
  43. GRB 120811C: Swift-BAT refined analysis
  44. GRB 120811A: Swift-BAT refined analysis
  45. GRB 120811C: Bassano Bresciano Observatory optical observations
  46. GRB 120811C: Swift-XRT refined Analysis
  47. GRB 120811C: Swift/UVOT Detection
  48. Improved IPN error box for short hard GRB 120811B
  49. GRB 120811C: RTT150 optical observations
  50. GRB 120811C: Enhanced Swift-XRT position
  51. GRB 120811C: TAROT Calern observatory optical observations
  52. GRB 120811C: Swift detection of a burst with an optical counterpart
  53. IPN Triangulation of short hard GRB 120811B
  54. Trigger 530588: Swift detection of XMM J174457-2850.3
  55. Swift Trigger 530581: GRB 120811A or a galactic transient
  56. GRB 120803A: optical upper limit
  57. GRB 120807A: Swift/UVOT Upper Limits
  58. GRB 120803A: Confirmation of the X-ray afterglow
  59. GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
  60. Swift Trigger 530441 is a false trigger
  61. GRB 120807A: Swift-XRT refined Analysis
  62. GRB 120807A: Fermi/LAT upper limit
  63. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  64. GRB 120807A: TAROT La Silla observatory optical observations
  65. GRB 120807A: Swift-BAT refined analysis
  66. GRB 120807A: Enhanced Swift-XRT position
  67. GRB 120807A: Swift detection of a burst
  68. Fermi/GBM detection of an SGR-like burst
  69. Swift-BAT trigger 530214 is noise
  70. GRB 120805A: Swift/UVOT Upper Limits
  71. Swift trigger 530214: uncertain if real or not
  72. Swift-BAT trigger 529813 is due to noise while entering the SAA
  73. GRB 120728A: Fermi GBM observation
  74. GRB 120805A: Swift-BAT refined analysis
  75. GRB 120802A: Swift/UVOT Upper Limits
  76. GRB 120805A: Swift-XRT refined Analysis
  77. GRB120805A: Liverpool Telescope observations
  78. GRB 120805A: TAROT Calern observatory optical observations
  79. GRB 120805A: Swift detection of a burst
  80. GRB 120804A: EVLA Detection
  81. GRB 120804A: Swift-BAT Spectral lag analysis
  82. GRB 120803B: Swift-XRT refined Analysis
  83. GRB 120804A: Swift/UVOT Upper Limits
  84. GRB 120804A: Swift-BAT refined analysis
  85. GRB 120804A: Swift-XRT refined Analysis
  86. GRB 120804A: GROND upper limits
  87. GRB 120802A: EVLA Observations
  88. GRB 120804A: Enhanced Swift-XRT position
  89. GRB 120804A: Swift detection of a short burst
  90. GRB 120803B: Swift-BAT refined analysis
  91. GRB 120803B: Enhanced Swift-XRT position
  92. GRB 120803A: Swift-XRT Observations
  93. GRB 120803A: Swift-BAT refined analysis
  94. GRB 120803B: Swift detection of a burst
  95. GRB 120803A: Swift detection of a possible burst
  96. GRB 120802A: GRT Optical Observation
  97. GRB 120802A: Swift-XRT refined Analysis
  98. GRB 120729A: Fermi GBM observation
  99. GRB 120802A: Swift-BAT refined analysis
  100. GRB 120802A: Enhanced Swift-XRT position

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