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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"

19670 results found.

  1. GRB 120817A: Swift/UVOT Upper Limits
  2. GRB 120821A: Swift/XRT observations
  3. GRB 120821A: Swift/UVOT Upper Limits
  4. GRB 120821A: GROND upper limits
  5. GRB 120817B - PTF Observations
  6. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  7. GRB 120817B: BAT location in ground analysis and refined analysis
  8. GRB 120819A: Bassano Bresciano Observatory optical observations
  9. GRB 120819A: Swift-BAT refined analysis
  10. GRB 120819A: GROND afterglow confirmation
  11. GRB 120819A: Swift-XRT refined Analysis
  12. GRB 120819A: Enhanced Swift-XRT position
  13. GRB 120819A: MASTER optical observations
  14. GRB 120819A: Swift detection of a burst
  15. GRB 120817B: Swift-XRT observations
  16. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  17. GRB 120815A: MASTER-ICATE observations
  18. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  19. GRB 120817A: Swift-XRT refined Analysis
  20. IPN Triangulation of GRB 120817B (short/very intense)
  21. GRB 120817A: Swift-BAT refined analysis
  22. GRB 120816A: optical upper limit
  23. GRB 120817A: Enhanced Swift-XRT position
  24. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  25. GRB 120816A: Bassano Bresciano Observatory optical observations
  26. GRB 120816A: Swift-XRT refined Analysis
  27. GRB 120817A: Swift-XRT observations
  28. GRB 120817A: Swift detection of a burst
  29. GRB 120816A: Enhanced Swift-XRT position
  30. GRB 120816A: Swift-BAT refined analysis
  31. GRB 120816A: TAROT Calern observatory optical observations
  32. GRB 120816A: ROTSE-III Optical Limits
  33. GRB 120816A: Swift detection of a burst
  34. GRB 120815A: Swift-XRT refined Analysis
  35. GRB 120815A: Swift-BAT refined analysis
  36. GRB 120815A: Enhanced Swift-XRT position
  37. GRB 120815A: GROND afterglow candidate
  38. GRB 120815A: Swift-XRT observations
  39. GRB 120815A: TAROT La Silla observatory optical observations
  40. GRB 120815A: Swift detection of a burst
  41. GRB 120804A: Possible temporal break in the X-ray light-curve
  42. GCN for GRB 120811C
  43. GRB 120811A: Swift/XRT-UVOT Obseravations
  44. GRB120804A: Chandra observations and afterglow detection
  45. GRB 120805A: Enhanced Swift-XRT position
  46. GRB 120811C: EVLA Observations
  47. GRB 120811C: RTT150 optical observations
  48. GRB 120811C: MASTER-Tunka OT observations
  49. GRB 120811C: Swift-BAT refined analysis
  50. GRB 120811A: Swift-BAT refined analysis
  51. GRB 120811C: Bassano Bresciano Observatory optical observations
  52. GRB 120811C: Swift-XRT refined Analysis
  53. GRB 120811C: Swift/UVOT Detection
  54. Improved IPN error box for short hard GRB 120811B
  55. GRB 120811C: RTT150 optical observations
  56. GRB 120811C: Enhanced Swift-XRT position
  57. GRB 120811C: TAROT Calern observatory optical observations
  58. GRB 120811C: Swift detection of a burst with an optical counterpart
  59. IPN Triangulation of short hard GRB 120811B
  60. Trigger 530588: Swift detection of XMM J174457-2850.3
  61. Swift Trigger 530581: GRB 120811A or a galactic transient
  62. GRB 120803A: optical upper limit
  63. GRB 120807A: Swift/UVOT Upper Limits
  64. GRB 120803A: Confirmation of the X-ray afterglow
  65. GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
  66. Swift Trigger 530441 is a false trigger
  67. GRB 120807A: Swift-XRT refined Analysis
  68. GRB 120807A: Fermi/LAT upper limit
  69. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  70. GRB 120807A: TAROT La Silla observatory optical observations
  71. GRB 120807A: Swift-BAT refined analysis
  72. GRB 120807A: Enhanced Swift-XRT position
  73. GRB 120807A: Swift detection of a burst
  74. Fermi/GBM detection of an SGR-like burst
  75. Swift-BAT trigger 530214 is noise
  76. GRB 120805A: Swift/UVOT Upper Limits
  77. Swift trigger 530214: uncertain if real or not
  78. Swift-BAT trigger 529813 is due to noise while entering the SAA
  79. GRB 120728A: Fermi GBM observation
  80. GRB 120805A: Swift-BAT refined analysis
  81. GRB 120802A: Swift/UVOT Upper Limits
  82. GRB 120805A: Swift-XRT refined Analysis
  83. GRB120805A: Liverpool Telescope observations
  84. GRB 120805A: TAROT Calern observatory optical observations
  85. GRB 120805A: Swift detection of a burst
  86. GRB 120804A: EVLA Detection
  87. GRB 120804A: Swift-BAT Spectral lag analysis
  88. GRB 120803B: Swift-XRT refined Analysis
  89. GRB 120804A: Swift/UVOT Upper Limits
  90. GRB 120804A: Swift-BAT refined analysis
  91. GRB 120804A: Swift-XRT refined Analysis
  92. GRB 120804A: GROND upper limits
  93. GRB 120802A: EVLA Observations
  94. GRB 120804A: Enhanced Swift-XRT position
  95. GRB 120804A: Swift detection of a short burst
  96. GRB 120803B: Swift-BAT refined analysis
  97. GRB 120803B: Enhanced Swift-XRT position
  98. GRB 120803A: Swift-XRT Observations
  99. GRB 120803A: Swift-BAT refined analysis
  100. GRB 120803B: Swift detection of a burst

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