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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

18480 results found.

  1. GRB 051006: XRT refined analysis
  2. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  3. GRB051006: Refined analysis of the Swift-BAT burst
  4. GRB 051006: XRT position
  5. GRB051006: Swift detection of a burst
  6. GRB 050906, summary of radio observations
  7. GRB051001: Swift UVOT Upper Limits
  8. GRB 051001, optical observations at Mt. John
  9. GRB 051001: AAT infra-red observations
  10. GRB 051001: Swift Detection of a Burst
  11. GRB050908: optical observations
  12. GRB 050820A: NIR photometry at the TNG
  13. GRB/SGR 050925: IR Observations
  14. GRB050925: Swift UVOT upper limits
  15. Refined analysis of the Swift-BAT soft short burst
  16. GRB050925: Faulkes Telescope North R-band limit
  17. GRB050925: Swift-BAT detection of a short burst
  18. GRB050922B: Swift UVOT early upper limits.
  19. INT 2.5m limit for GRB050922B
  20. GRB 050922C: Swift XRT refined analysis
  21. GRB 050922C: Swift-BAT refined analysis
  22. GRB 050922C: optical obserations
  23. GRB 050922C: NOT optical observations
  24. GRB 050922C: Swift detection of a bright burst
  25. GRB 050922B: ROTSE-III Optical Limits
  26. GRB 050922B,optical observation
  27. GRB050922B: Swift-BAT detection of a weak long burst
  28. GRB050820B: analysis of the XMM-Newton observation
  29. GRB050916: Swift/UVOT Upper Limits
  30. Swift-BAT trigger 155764 is not a GRB
  31. Swift-BAT trigger 155764 is probably not a GRB
  32. Swift trigger 155764: bad XRT centroid
  33. Swift-BAT trigger 155535 is definitely not a GRB
  34. GRB050916 : Swift-XRT refined analysis
  35. GRB 050916: XRT position
  36. GRB 050915B: Swift-BAT refined analysis
  37. GRB 050915B: Swift/UVOT Upper Limits
  38. GRB 050915a: IR Transient
  39. GRB 050915B: XRT position
  40. GRB 050915b, SMARTS optical/IR observations
  41. GRB050915B: Swift-BAT detection of a long bright burst
  42. GRB050915: Swift/UVOT upper limits
  43. GRB 050915: IR Observations
  44. GRB 050915: Swift-BAT refined analysis
  45. GRB050915: XRT position
  46. GRB 050915: Swift detection of a GRB
  47. Swift-BAT trigger 155072 is probably not a GRB
  48. GRB 050911: z~0.16 cluster in the field
  49. GRB050911: Swift-BAT detection of a long burst
  50. GRB 050910a: TAROT early optical limits
  51. GRB 050906: Possible X-ray Counterpart
  52. GRB050908: Swift/UVOT Early upper limits
  53. GRB050908 : Swift-XRT refined analysis
  54. GRB 050908: Swift-BAT refined analysis
  55. GRB 050908: Optical observations
  56. GRB 050908: spectroscopic redshift
  57. GRB 050908: Swift detection of a burst
  58. Swift trigger 154073 is not a GRB
  59. GRB 050906: Optical observations at the Very Large Telescope
  60. GRB 050904: Subaru Optical Spectroscopy
  61. GRB 050906: Swift-BAT refined analysis
  62. GRB 050906: Swift XRT upper limit
  63. GRB 050904: Keck I-band Imaging
  64. GRB050906: P60 Observations
  65. GRB 050904: photometric redshift
  66. GRB 050904: Swift/UVOT observations
  67. GRB 050904: NIR object inside the XRT error box
  68. GRB 050904: TAROT optical measurements
  69. GRB050904: Optical Observations
  70. GRB 050904: Environmental Constraints
  71. GRB050904: P60 Observations
  72. GRB 050904: TAROT optical limits
  73. GRB 050827 : OSN 1.5m optical observations
  74. GRB 050827: P200 NIR Observations
  75. GRB050827: Swift/UVOT upper limits
  76. GRB 050827: XRT possible afterglow detection
  77. GRB050824: Maidanak optical limits
  78. Subaru Observations of GRB050724
  79. GRB 050826: Optical Candidate
  80. GRB 050826: BAT refined analysis
  81. GRB050826: Swift/UVOT early upper limits
  82. GRB 050826: Swift XRT position
  83. GRB050826: Swift-BAT detection of a long burst
  84. XRF050509c: Radio upper limits from GMRT
  85. GRB050822: Swift/UVOT upper limits
  86. GRB050813: Maidanak I-band observations
  87. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  88. GRB050820B at FRAM
  89. Swift/UVOT UV Photometry of GRB 050820B
  90. GRB 050822: Swift detection of a long burst
  91. GRB050820a BVRcIc field photometry
  92. GRB050820B XMM-Newton observation
  93. GRB 050820B: Swift XRT position
  94. GRB050820B: Refined analysis of the Swift-BAT burst
  95. GRB050820: refined XRT analysis
  96. GRB 050820: Early RAPTOR detections
  97. GRB050819: refined XRT analysis
  98. GRB 050820: Swift detection of a GRB
  99. GRB050819: Swift XRT position
  100. GRB050819: Swift-BAT detection of a weak burst

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