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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"

19611 results found.

  1. GRB 150811A: Swift detection of a burst
  2. GRB 150727A: IRSF NIR observation
  3. GRB 150801A: Swift-XRT observations
  4. GRB 150801B: Swift/UVOT Upper Limits
  5. GRB 150801B: Swift-BAT refined analysis
  6. GRB 150801B: Swift-XRT refined Analysis
  7. GRB 150801B: Enhanced Swift-XRT position
  8. GRB 150801B: Swift detection of a burst
  9. GRB 150801A: Tiled Swift observations
  10. GRB 150724B: Swift-XRT afterglow detection
  11. GRB150724B: Retraction of the uvot detection
  12. GRB 150728A: TSHAO optical observations
  13. GRB 150728A: RATIR Optical Observations
  14. GRB 150728A: AAO optical observations
  15. GRB 150728A: Swift-XRT refined Analysis
  16. GRB 150728A: Swift/UVOT Upper Limits
  17. GRB 150728A: Swift-BAT refined analysis
  18. GRB 150728A: FTN observations
  19. GRB 150727A: RATIR Optical Observations
  20. GRB 150728A: Enhanced Swift-XRT position
  21. GRB 150728A: Swift detection of a GRB
  22. GRB 150727A: Swift-BAT refined analysis
  23. GRB 150727A: Swift/UVOT Detection
  24. GRB 150727A: Swift-XRT refined Analysis
  25. GRB 150727A: Fermi GBM detection
  26. GRB 150727A: Enhanced Swift-XRT position
  27. GRB 150724B: MASTER upper limit
  28. GRB 150727A: Swift detection of a burst with an optical counterpart
  29. GRB 150724B: Swift/UVOT Detection
  30. GRB 150724B: RATIR Optical Observations
  31. Swift Trigger 650408 is not a burst
  32. Swift 650221/IGR J00291+5934: Liverpool Telescope observations
  33. GRB 150724B: Swift-XRT observations
  34. GRB 150724B: Swift ToO observations
  35. IGR J00291+5934, Swift-BAT refined analysis
  36. GRB 150724B: Fermi-LAT detection
  37. Swift Trigger 650221 / IGR J00291+5934: MASTER-IAC OT observations
  38. Trigger 650221: Swift detection of a IGR J00291+5934
  39. Correction to GCN 18059: Parameterisation of Swift-XRT light curve
  40. GRB 150724A: Swift-XRT refined Analysis
  41. Swift IGR J00291+5934: MASTER Optical flare detection
  42. GRB 150724A: Swift/UVOT Upper Limits
  43. IGR J00291+5934: Swift-BAT refined analysis
  44. GRB 150724A: Swift-BAT refined analysis
  45. GRB 150724A: Enhanced Swift-XRT position
  46. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  47. GRB 150724A: Prompt enhanced Swift-XRT position
  48. Trigger 650140: Swift detection of IGR J00291+5934
  49. GRB 150724A: Swift detection of a burst
  50. GRB 150722A: Swift-BAT refined analysis
  51. GRB 150722A: Swift-XRT refined Analysis
  52. GRB 150722A: Swift/UVOT Upper Limits
  53. GRB 150720A: Swift/UVOT Upper Limits
  54. GRB 150722A: Enhanced Swift-XRT position
  55. GRB 150722A: Swift-XRT observations
  56. GRB 150722A: Swift detection of a burst
  57. GRB 150720A: Enhanced Swift-XRT position
  58. GRB 150720A: Swift-XRT refined Analysis
  59. GRB 150720A: Swift-BAT refined analysis
  60. Swift Trigger 649706: a possible GRB or bright Galactic transient
  61. GRB 150716A: KAIT Optical Upper Limit
  62. GRB 150716A: Swift-BAT refined analysis
  63. GRB 150716A: Swift/UVOT Upper Limits
  64. Swift trigger 649143 is not AX J1619.4-4945 or other astrophysical source
  65. GRB 150716A: Swift-XRT refined Analysis
  66. GRB 150716A: P60 Candidate Optical Afterglow
  67. GRB 150716A: RATIR Optical Observations
  68. GRB 150716A: Swift detection of a burst
  69. Trigger 649143: Swift detection of AX J1619.4-4945
  70. Trigger 649113: Swift detection of SGR 1E 1841-045
  71. GRB 150710B: Swift-XRT afterglow detection
  72. GRB 150711A: Swift-BAT refined analysis
  73. Konus-Wind observation of GRB 150710B
  74. GRB 150710B: Swift-XRT and Swift-UVOT observations
  75. GRB 150711A: Swift/UVOT Upper Limits
  76. GRB 150711A: Swift-XRT refined Analysis
  77. GRB 150711A: Fermi GBM detection
  78. GRB 150710B refined analysis
  79. GRB 150711A: Enhanced Swift-XRT position
  80. GRB 150711A: Swift detection of a burst
  81. GRB 150710B: Swift ToO observations
  82. GRB 150710B detected in ground analysis of BAT data
  83. GRB 150710A: Swift/UVOT Upper Limits
  84. GRB 150710A: host galaxy for Swift XRT second candidate
  85. Swift-XRT observations of GRB 150710A
  86. Confirmation that Swift trigger 648422 is not an astrophysical source
  87. Konus-Wind observation of GRB 150710A (Swift trigger 648437)
  88. GRB 150710A: Swift-BAT refined analysis
  89. GRB 150710A: RATIR Observations
  90. Swift trigger 648437: A GRB or a burst from 1RXS J125754.7+141850
  91. Swift Trigger 648422: Swift-XRT observations
  92. Trigger 648422: Swift possible detection of a source in NGC4552
  93. IPN Triangulation of GRB 150702A
  94. GRB 150702A: Swift-XRT observations
  95. GRB 150702A: Swift ToO observations
  96. GRB 150702A: Fermi-LAT detection
  97. GRB 150622A: Swift-XRT afterglow detection
  98. Swift Trigger 647642 is probably not an astrophysical source
  99. GRB 150626B, Swift-BAT refined analysis
  100. V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO

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