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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"

36107 results found.

  1. GRB 051016: PROMPT Observations
  2. GRB051016: Swift detection of a burst
  3. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  4. GRB051006: optical observations
  5. GRB 051012: Swift-BAT detection of burst yesterday
  6. Swift trigger 159578 is not a burst
  7. GRB 051006: Swift/UVOT Upper Limits
  8. IBAS Alert 2675 : not a GRB
  9. GRB051008: optical candidate
  10. GRB 051008: - a high redshift high-luminosity burst?
  11. GRB 051008 - a low redshift low-luminosity burst?
  12. IBAS Alert 2673: not a real GRB
  13. GRB051011: MASTER optical observation
  14. GRB051008: optical observation
  15. GRB051008: Swift XRT refined analysis
  16. GRB051008 - Swift UVOT upper limits
  17. Konus-Wind observation of GRB 051008
  18. GRB051008: Final refined analysis of the Swift-BAT burst
  19. GRB 051008: R-band upper limit
  20. GRB051008: Radio Observation
  21. GRB 051008: Swift XRT position
  22. GRB 051008, optical observations
  23. GRB 051008: early Swift XRT analysis
  24. GRB 051008: Swift UVOT Candidate
  25. GRB 051006: P60 Observations
  26. grb test
  27. GRB 051006: XRT refined analysis
  28. GRB 051006: optical observations at Sierra Nevada
  29. GRB 051006: XRT position
  30. GRB 050906, summary of radio observations
  31. GRB 050925: Second Epoch WSRT Radio Observations
  32. GRB 051001: Swift XRT refined analysis
  33. GRB 051001, optical observations at Mt. John
  34. GRB 051001: I-band limit
  35. GRB 051001: AAT infra-red observations
  36. GRB 051001: Swift-BAT refined analysis
  37. GRB 051001: Swift Detection of a Burst
  38. GRB 051001: ROTSE-III Optical Limits
  39. GRB050908: optical observations
  40. GRB050922C: optical observation
  41. GRB050922B: optical limit
  42. GRB 050922C: further VLT observations
  43. GRB 050820A: NIR photometry at the TNG
  44. GRB050922C: UVES/VLT high resolution spectroscopy
  45. GRB050925: Swift/XRT limits
  46. GRB/SGR 050925: IR Observations
  47. GRB 050922C: break in the lightcurve
  48. GRB 050925: WSRT Radio Observations
  49. GRB 050925 : I-band observation at Xinglong observatory
  50. GRB050925: Faulkes Telescope North R-band limit
  51. GRB050925: Swift-BAT detection of a short burst
  52. GRB 050922B: Correction to BAT refined analysis, longer burst
  53. GRB050922C: TNG spectroscopic observations
  54. GRB050922B: refined XRT analysis
  55. Konus-Wind observation of GRB 050922C
  56. GRB 050922C: Refined redshift
  57. GRB OT observation
  58. GRB050922C: observation at MonteBoo
  59. INT 2.5m limit for GRB050922B
  60. GRB 050922B: optical limit
  61. GRB050922C: Optical Observations
  62. GRB 050922C: Swift XRT refined analysis
  63. HETE Fregate observations of GRB 050922C
  64. GRB 050922C: Swift-BAT refined analysis
  65. GRB 050922B: Swift-BAT refined analysis
  66. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  67. GRB 050922C: optical obserations
  68. GRB 050922C: NOT optical observations
  69. GRB 050922A: Analysis of Swift/XRT TOO observation
  70. GRB 050922C: Swift detection of a bright burst
  71. GRB 050922C: ROTSE-IIId Refined Analysis
  72. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  73. GRB 050922B: ROTSE-III Optical Limits
  74. GRB 050922B,optical observation
  75. GRB050922B: Swift-BAT detection of a weak long burst
  76. Possible GRB 050922 detected by INTEGRAL
  77. GRB050820B: analysis of the XMM-Newton observation
  78. GRB050916: Swift/UVOT Upper Limits
  79. GRB 050916: Swift-BAT refined analysis
  80. GRB 050918 - A long GRB detected by INTEGRAL
  81. GRB 050915a: Radio Observations
  82. Swift-BAT trigger 155764 is not a GRB
  83. Swift-BAT trigger 155764 is probably not a GRB
  84. Swift-BAT trigger 155535 is definitely not a GRB
  85. GRB 050916: XRT position
  86. GRB 050915b, SMARTS optical/IR observations of the XRT position
  87. GRB 050915B: Swift-BAT refined analysis
  88. GRB 050915B: Swift/UVOT Upper Limits
  89. GRB 050915a: IR Transient
  90. GRB 050915B: XRT position
  91. GRB 050915b, SMARTS optical/IR observations
  92. GRB 050915: KAIT optical limit
  93. GRB 050915: IR Observations
  94. GRB 050915: Swift XRT refined analysis
  95. GRB 050915: Swift-BAT refined analysis
  96. GRB050915: P60 Optical Observations
  97. GRB 050915: ROTSE-III optical limits
  98. GRB 050915: Swift detection of a GRB
  99. GRB050911: Upper limit on X-ray afterglow
  100. Swift-BAT trigger 155072 ground analysis

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