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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 140614A: Swift-BAT refined analysis
  2. GRB 140614A: X-shooter redshift
  3. GRB 140614B: Swift/UVOT Upper Limits
  4. GRB 140614B: RATIR Optical and NIR Observations
  5. GRB 140614A: Swift/UVOT Upper Limits
  6. GRB 140614A: Swift-XRT refined Analysis
  7. GRB 140614B: Enhanced Swift-XRT position
  8. GRB 140614B: Swift detection of a burst
  9. GRB 140614A: Enhanced Swift-XRT position
  10. GRB 140614A: GROND afterglow candidate
  11. GRB 140614A: Swift detection of a burst
  12. GRB 140611A: Swift-XRT observations
  13. Konus-Wind observation of GRB 140611A
  14. GRB 140610A: Swift-XRT refined Analysis
  15. GRB 140611A Detection of a source in BAT ground analysis
  16. GRB 140610A: Fermi GBM Detection
  17. IPN Triangulation of GRB 140611A (short/hard)
  18. GRB 140610A: RATIR Optical and NIR Observations
  19. GRB 140610A: Swift-BAT refined analysis
  20. GRB 140610A: MASTER optical observations
  21. GRB 140610A: Swift/UVOT Upper Limits
  22. Konus-Wind observation of GRB 140610A
  23. Swift/XRT returns to normal observing
  24. GRB 140610A: Swift-XRT observations
  25. GRB 140610A: Swift detection of a burst
  26. GRB 140606B: Swift XRT refined analysis
  27. GRB 140521A: AAO optical upper limit
  28. GRB 140606A: AAO optical upper limit
  29. GRB 140607A: Swift-BAT refined analysis
  30. GRB 140606B: Swift/UVOT Upper Limits
  31. GRB 140606B: Swift XRT position
  32. GRB 140607A: Swift detection of a burst
  33. GRB 140606A: BOOTES-2 optical upper limit
  34. GRB 140606A: Swift/UVOT Upper Limits
  35. GRB 140606A: Swift-XRT upper limits
  36. Swift XRT status update
  37. Swift Trigger 600914 is noise
  38. GRB 140606A: Swift-BAT refined analysis
  39. GRB 140606A: Swift detection of a short hard burst
  40. Swift Trigger 600914 is probably a noise fluctuation
  41. Swift XRT is off-line
  42. GRB 140523A: further Swift-XRT observations
  43. GRB 140529A BAT refined analysis
  44. GRB 140529A: Swift/UVOT Upper Limits
  45. GRB 140529A: Swift-XRT afterglow detection.
  46. GRB 140408A: Withdrawal of afterglow candidate
  47. GRB 140529A found in ground analysis of BAT slew data
  48. Swift Trigger 600114 in M31: UVOT Observations
  49. Swift trigger 600114 is not an outbursting X-ray source
  50. Swift Trigger 600114: Optical spectroscopy from GTC
  51. Swift Trigger 600114: Preliminary BAT analysis
  52. Swift Trigger 600114 in M31: Archival and Prompt UVOT Imaging
  53. Swift detection of a bright X-ray source in M31
  54. Swift detection of SFXT IGR J17544-2619
  55. GRB 140523A: NOT observation
  56. IPN Triangulation of GRB 140523A
  57. Swift trigger 599860 probably not real
  58. GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations
  59. GRB 140523A Tiled Swift observations
  60. GRB 140523A: Fermi-LAT detection
  61. GRB 140521A: Fermi GBM Detection
  62. GRB 140423A: TShAO optical observations
  63. GRB 140521A: AAO optical observations
  64. GRB 140521A: Swift-BAT refined analysis
  65. GRB 140521A: AROMA-N Optical Observation
  66. GRB 140516A: further Swift-XRT analysis
  67. GRB 140521A: MASTER optical observations
  68. GRB 140521A: Swift detection of a burst
  69. GRB 140518A: T100 observations
  70. GRB 140512A: MASTER prompt and afterglow optical observations
  71. GRB 140518A, Swift-BAT refined analysis
  72. GRB 140518A: Swift-XRT refined Analysis
  73. GRB 140518A: Skynet GORT Detections of the Optical Afterglow
  74. GRB 140518A: Swift/UVOT Upper Limits
  75. GRB 140518A: RATIR Optical and NIR Observations
  76. GRB 140518A: P60 i-/z-band detections
  77. GRB 140518A: KAIT optical candidate
  78. GRB 140518A: Swift detection of a burst
  79. GRB 140516A: RATIR Optical and NIR Observations
  80. GRB 140516A: Swift/UVOT Upper Limits
  81. GRB 140516A: Swift-BAT refined analysis
  82. GRB 140516A: Swift-XRT refined Analysis
  83. GRB 140516A: Enhanced Swift-XRT position
  84. GRB 140516A: MASTER early optical observations
  85. GRB 140516A: Swift detection of a short burst
  86. GRB 140515A: Swift-BAT refined analysis
  87. GRB 140419A: Continued Mondy optical observations
  88. GRB 140515A: GROND observation of the afterglow
  89. GRB 140515A: Swift-XRT refined Analysis
  90. GRB 140515A: KAIT Optical Upper Limit
  91. GRB 140515A: Swift/UVOT Upper Limits
  92. GRB 140423A: HCT optical observations
  93. GRB 140515A: Enhanced Swift-XRT position
  94. Trigger 599041: Swift detection of SFXT IGR J16479-4514
  95. GRB 140515A: Swift detection of a burst
  96. Konus-Wind observation of GRB 140512A
  97. GRB 140423A: AAO optical upper limits
  98. GRB 140512A: Continued UVOT Observations
  99. GRB 140512A: Fermi GBM detection
  100. GRB 140508A: Mondy upper limit

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