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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"

37237 results found.

  1. GRB051016 XMM-Newton observation
  2. GRB051016: Swift XRT refined analysis.
  3. GRB 051016: LCO optical and near-IR imaging
  4. GRB 051016: PROMPT Observations
  5. GRB051016: Swift detection of a burst
  6. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  7. GRB051006: optical observations
  8. GRB 051012: Swift-BAT detection of burst yesterday
  9. Swift trigger 159578 is not a burst
  10. Swift-BAT Trigger 159578 is a possible burst
  11. GRB 051006: Swift/UVOT Upper Limits
  12. IBAS Alert 2675 : not a GRB
  13. GRB051008: optical candidate
  14. GRB 051008: - a high redshift high-luminosity burst?
  15. GRB 051008 - a low redshift low-luminosity burst?
  16. IBAS Alert 2673: not a real GRB
  17. GRB051011: MASTER optical observation
  18. GRB051008: optical observation
  19. GRB051008: Swift XRT refined analysis
  20. GRB051008 - Swift UVOT upper limits
  21. Konus-Wind observation of GRB 051008
  22. GRB051008: Final refined analysis of the Swift-BAT burst
  23. GRB 051008: R-band upper limit
  24. GRB051008: Radio Observation
  25. GRB 051008: Swift XRT position
  26. GRB 051008, optical observations
  27. GRB 051008: early Swift XRT analysis
  28. GRB 051008: Swift UVOT Candidate
  29. GRB 051006: P60 Observations
  30. grb test
  31. GRB 051006: XRT refined analysis
  32. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  33. GRB 051006: optical observations at Sierra Nevada
  34. GRB 051006: XRT position
  35. GRB 050906, summary of radio observations
  36. GRB 050925: Second Epoch WSRT Radio Observations
  37. GRB 051001: Swift XRT refined analysis
  38. GRB 051001, optical observations at Mt. John
  39. GRB 051001: I-band limit
  40. GRB 051001: AAT infra-red observations
  41. GRB 051001: Swift-BAT refined analysis
  42. GRB 051001: Swift Detection of a Burst
  43. GRB 051001: ROTSE-III Optical Limits
  44. GRB050908: optical observations
  45. GRB050922C: optical observation
  46. GRB050922B: optical limit
  47. GRB 050922C: further VLT observations
  48. GRB 050820A: NIR photometry at the TNG
  49. GRB050922C: UVES/VLT high resolution spectroscopy
  50. GRB050925: Swift/XRT limits
  51. GRB/SGR 050925: IR Observations
  52. GRB 050922C: break in the lightcurve
  53. GRB 050925: WSRT Radio Observations
  54. GRB 050925 : I-band observation at Xinglong observatory
  55. GRB050925: Faulkes Telescope North R-band limit
  56. GRB050925: Swift-BAT detection of a short burst
  57. GRB 050922B: Correction to BAT refined analysis, longer burst
  58. GRB050922C: TNG spectroscopic observations
  59. GRB050922B: refined XRT analysis
  60. Konus-Wind observation of GRB 050922C
  61. GRB 050922C: Refined redshift
  62. GRB050922B: Swift UVOT early upper limits.
  63. GRB OT observation
  64. GRB050922C: observation at MonteBoo
  65. INT 2.5m limit for GRB050922B
  66. GRB 050922B: optical limit
  67. GRB050922C: Optical Observations
  68. GRB 050922C: Swift XRT refined analysis
  69. HETE Fregate observations of GRB 050922C
  70. GRB 050922C: Swift-BAT refined analysis
  71. GRB 050922B: Swift-BAT refined analysis
  72. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  73. GRB 050922C: optical obserations
  74. GRB 050922C: NOT optical observations
  75. GRB 050922A: Analysis of Swift/XRT TOO observation
  76. GRB 050922C: Swift detection of a bright burst
  77. GRB 050922C: ROTSE-IIId Refined Analysis
  78. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  79. GRB 050922B: ROTSE-III Optical Limits
  80. GRB 050922B,optical observation
  81. GRB050922B: Swift-BAT detection of a weak long burst
  82. Possible GRB 050922 detected by INTEGRAL
  83. GRB050820B: analysis of the XMM-Newton observation
  84. GRB050916: Swift/UVOT Upper Limits
  85. GRB 050916: Swift-BAT refined analysis
  86. GRB 050918 - A long GRB detected by INTEGRAL
  87. GRB 050915a: Radio Observations
  88. Swift-BAT trigger 155764 is not a GRB
  89. Swift-BAT trigger 155764 is probably not a GRB
  90. Swift-BAT trigger 155535 is definitely not a GRB
  91. GRB050916 : Swift-XRT refined analysis
  92. GRB 050916: XRT position
  93. GRB 050915b, SMARTS optical/IR observations of the XRT position
  94. GRB 050915B: Swift-BAT refined analysis
  95. GRB 050915B: Swift/UVOT Upper Limits
  96. GRB 050915a: IR Transient
  97. GRB 050915B: XRT position
  98. GRB 050915b, SMARTS optical/IR observations
  99. GRB 050915: KAIT optical limit
  100. GRB 050915: IR Observations

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