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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"

19605 results found.

  1. GRB 050908: KAIT observations
  2. GRB 050908: P60 Confirmation of Optical Afterglow
  3. GRB 050908: Swift detection of a burst
  4. Swift trigger 154073 is not a GRB
  5. GRB050904: CrAO optical observations
  6. GRB 050904 BAT refined analysis of complete data set
  7. GRB 050906: MARGE Optical Limits
  8. GRB 050906: Swift-BAT refined analysis
  9. GRB 050906: Swift XRT upper limit
  10. GRB050906: P60 Observations
  11. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  12. GRB 050906: Bright galaxy in BAT error box
  13. GRB 050906: Swift/BAT Detection of a possible burst
  14. GRB 050904: Swift/UVOT observations
  15. GRB 050904: early Swift XRT analysis results
  16. GRB 050904: BAT refined analysis of partial data set
  17. GRB050904: P60 Observations
  18. GRB 050904: TAROT optical limits
  19. GRB050904: Swift-BAT detection of a probable burst
  20. Swift-BAT triggers 153461-153465 are not GRBs
  21. Retraction of Swift-BAT trigger #153355
  22. GRB 050824: MDM Observations
  23. GRB 050827: Swift XRT preliminary analysis results
  24. Swift Trigger #152652 is not a GRB
  25. GRB050827: Swift/UVOT upper limits
  26. GRB 050827: Optical Limit
  27. GRB 050827: XRT possible afterglow detection
  28. GRB050827: RTT150 optical observations
  29. GRB 050827: Swift-BAT refined analysis
  30. GRB050827: Swift-BAT detection of a burst
  31. GRB 050826: Optical Candidate
  32. GRB050824, HETE-2 Observation
  33. GRB 050826: Swift XRT preliminary analysis results
  34. GRB 050826: BAT refined analysis
  35. GRB050826: Swift/UVOT early upper limits
  36. GRB050824: First 2 hours of power low optical decay?
  37. GRB 050826: Swift XRT position
  38. GRB050826: Swift-BAT detection of a long burst
  39. GRB050824: MASTER final analysis of the OT observations
  40. Possible GRB050825:MASTER optical observations
  41. Swift-BAT trigger 152038 is definitely not a GRB
  42. GRB050824: CORRECTION to UVOT observing times
  43. Swift-BAT trigger 152038 is probably not a GRB
  44. GRB050824: Swift/UVOT detection of fading afterglow
  45. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  46. GRB050824, I-band imaging
  47. GRB 050822: refined XRT analysis
  48. GRB 050824: XRT refined analysis and possible afterglow detection
  49. GRB 050824: BAT refined analysis of a soft weak burst
  50. GRB050824: MASTER:OT decay
  51. GRB050824: MASTER observation OT
  52. GRB050805a: MASTER optical candidat
  53. GRB 050824: ROTSE-III Optical Limits
  54. GRB050824: Swift-BAT detection of a burst
  55. GRB050822: Swift/UVOT upper limits
  56. GRB 050820A BAT observations of second, larger episode of emission
  57. GRB 050822: Swift-BAT refined analysis
  58. GRB 050820a - corrections to GCN 3846
  59. Swift/UVOT UV Photometry of GRB 050820B
  60. GRB 050822: ROTSE-III Prompt Optical Limits
  61. GRB 050822: Swift detection of a long burst
  62. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  63. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  64. GRB050820a BVRcIc field photometry
  65. GRB050820B XMM-Newton observation
  66. GRB 050820a: NIR Observations by WIRO
  67. GRB 050820B: Swift XRT position
  68. GRB050820B: Refined analysis of the Swift-BAT burst
  69. GRB050820B: BAT-Swift detection of a bright GRB
  70. Swift/UVOT photometry of GRB050820
  71. GRB050820: refined XRT analysis
  72. GRB 050820: Early RAPTOR detections
  73. GRB 050820 Swift-BAT refined analysis
  74. GRB050819: refined XRT analysis
  75. GRB 050820: Swift detection of a GRB
  76. GRB050820: Optical afterglow from P60
  77. GRB 050819 Swift-BAT refined analysis
  78. GRB050819: Swift XRT position
  79. GRB050819: Swift-BAT detection of a weak burst
  80. Swift-BAT trigger 150993 is not a GRB
  81. Swift Trigger 150823 is HETE J1900.1-2455
  82. GRB050817: Swift-BAT Detection of a burst
  83. GRB050815: Optical afterglow detection by Swift UVOT
  84. GRB050815: XRT refined analysis
  85. GRB050815: Refined analysis of the Swift-BAT burst
  86. GRB 050815: ROTSE-III Optical Limits
  87. GRB050815: Swift XRT afterglow localization
  88. GRB050815: Swift-BAT detection of a burst
  89. GRB050814: P60 Optical Afterglow Candidate
  90. GRB 050814: XRT refined analysis
  91. GRB050814: SWIFT/UVOT observation
  92. GRB050814: Refined analysis of the Swift-BAT burst
  93. GRB 050814: Swift XRT Afterglow Localization
  94. GRB 050814: Swift detection of a burst
  95. GRB050813, SDSS pre-burst observations
  96. GRB 050813: KAIT optical limit
  97. GRB 050813: Swift-BAT refined analysis
  98. GRB050813: SWIFT/UVOT observation
  99. GRB 050813: Swift XRT afterglow localization
  100. GRB 050813: Possible Short Swift-BAT GRB

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