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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"

19666 results found.

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

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