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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"

19261 results found.

  1. GRB 051008, optical observations
  2. GRB 051008: Swift UVOT Candidate
  3. GRB 051006: P60 Observations
  4. GRB 051006: XRT refined analysis
  5. GRB 051006: optical observations at Sierra Nevada
  6. GRB051006: Refined analysis of the Swift-BAT burst
  7. GRB 050925: Second Epoch WSRT Radio Observations
  8. GRB 051001: I-band limit
  9. GRB 051001: Swift-BAT refined analysis
  10. GRB050925: Swift/XRT limits
  11. GRB/SGR 050925: IR Observations
  12. GRB 050922C: break in the lightcurve
  13. Refined analysis of the Swift-BAT soft short burst
  14. GRB050922C: TNG spectroscopic observations
  15. GRB050922B: refined XRT analysis
  16. GRB050922C: Optical Observations
  17. GRB 050922C: Swift XRT refined analysis
  18. HETE Fregate observations of GRB 050922C
  19. GRB 050922C: Swift-BAT refined analysis
  20. GRB 050922B: Swift-BAT refined analysis
  21. GRB 050922C: NOT optical observations
  22. GRB 050922C: Swift detection of a bright burst
  23. Possible GRB 050922 detected by INTEGRAL
  24. GRB050918: Possible Swift/XRT detected afterglow
  25. GRB050820B: analysis of the XMM-Newton observation
  26. GRB 050916: Swift-BAT refined analysis
  27. GRB050916 : Swift-XRT refined analysis
  28. GRB 050915B: Swift-BAT refined analysis
  29. GRB 050915a: IR Transient
  30. GRB 050915: Swift XRT refined analysis
  31. GRB 050915: Swift-BAT refined analysis
  32. GRB050911: Upper limit on X-ray afterglow
  33. Swift-BAT trigger 155072 ground analysis
  34. GRB 050908: DEIMOS spectrum and further analysis
  35. GRB 050911, optical content of Swift/XRT error box
  36. GRB 050911: Swift-BAT refined analysis
  37. GRB050911: Swift-BAT detection of a long burst
  38. GRB 050910a: TAROT early optical limits
  39. WIRO observations in I of GRB 050908
  40. GRB 050906: Possible X-ray Counterpart
  41. GRB050908 : Swift-XRT refined analysis
  42. GRB 050908: Swift-BAT refined analysis
  43. GRB 050908: Optical observations
  44. GRB 050908: Optical Observations
  45. GRB 050904 BAT refined analysis of complete data set
  46. GRB 050906: MARGE Optical Limits
  47. GRB 050906: Swift-BAT refined analysis
  48. GRB 050906: Swift XRT upper limit
  49. GRB 050906: Radio Observations
  50. GRB 050904: more VLT NIR observations
  51. GRB 050904: Afterglow Astrometry
  52. GRB 050904: NIR object inside the XRT error box
  53. GRB 050904: early Swift XRT analysis results
  54. GRB 050904: SOAR YJ and PROMPT Ic Observations
  55. GRB050904: Optical Observations
  56. GRB 050827 : OSN 1.5m optical observations
  57. GRB 050827: Optical Limit
  58. GRB 050827: XRT possible afterglow detection
  59. GRB 050826 : Lulin R band observation
  60. GRB 050827: Swift-BAT refined analysis
  61. GRB 050826: Optical Candidate
  62. GRB 050826: Swift XRT preliminary analysis results
  63. GRB 050826: BAT refined analysis
  64. GRB050824: MASTER final analysis of the OT observations
  65. Swift-BAT trigger 152038 is probably not a GRB
  66. GRB 050824: XRT refined analysis and possible afterglow detection
  67. GRB 050824: BAT refined analysis of a soft weak burst
  68. GRB050824: MASTER:OT decay
  69. GRB050824: MASTER observation OT
  70. GRB050805a: MASTER optical candidat
  71. GRB050820a: PROMPT RcIc Observations
  72. VLT/UVES spectroscopy of GRB050820
  73. GRB 050820A BAT observations of second, larger episode of emission
  74. GRB 050822: Swift-BAT refined analysis
  75. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  76. GRB 050820a: NIR Observations by WIRO
  77. GRB050820B: Refined analysis of the Swift-BAT burst
  78. GRB050820: refined XRT analysis
  79. GRB 050820 Swift-BAT refined analysis
  80. GRB 050820: P60 Temporal Decay Index
  81. GRB050819: refined XRT analysis
  82. GRB 050820: Swift detection of a GRB
  83. GRB050820: Optical afterglow from P60
  84. GRB 050819 Swift-BAT refined analysis
  85. GRB050817: Negative Optical Observations
  86. GRB050815: Optical afterglow detection by Swift UVOT
  87. GRB050815: XRT refined analysis
  88. GRB050815: Refined analysis of the Swift-BAT burst
  89. GRB 050814: XRT refined analysis
  90. GRB050814: Refined analysis of the Swift-BAT burst
  91. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  92. GRB 050814: Swift XRT Afterglow Localization
  93. GRB 050813: Magellan detection of a high redshift galaxy cluster
  94. GRB050813, SDSS pre-burst observations
  95. GRB 050813: Swift-BAT refined analysis
  96. GRB 050813: Photometry of object in XRT error circle
  97. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  98. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  99. Detection of an intermediate burst from SGR 1806-20 on August 8
  100. GRB 050730: WSRT Radio Observations

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