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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"

21471 results found.

  1. GRB060418: Swift/UVOT Observations
  2. GRB 060418: FRAM early afterglow observation
  3. GRB 060418: Refined Analysis of the Swift-BAT burst
  4. VLT/UVES observations of GRB060418
  5. GRB060418: Swift XRT Team Refined Analysis
  6. GRB060418: Magellan/MIKE Spectroscopic Redshift
  7. GRB060418 : LT optical afterglow observation
  8. GRB 060418: REM candidate afterglow
  9. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  10. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  11. GRB060413: Swift/UVOT upper limits
  12. GRB 060413: REM NIR Observations
  13. SGR 1900+14: Swift detection of an outburst
  14. GRB 060413: Refined analysis of the Swift-BAT burst
  15. GRB 060413: Watcher UBVR observations
  16. GRB 060413: XRT refined analysis
  17. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  18. GRB 060413: Swift detection of a burst
  19. GRB060403: optical observations
  20. GRB 060403: MITSuME optical observation
  21. GRB060403: Optical Limit
  22. GRB060403: XRT refined analysis
  23. GRB 060403: Swift/UVOT upper limits
  24. SGR 1900+14: BAT observations
  25. GRB 060403: Refined analysis of the Swift-BAT burst
  26. GRB060403: Swift XRT refined position
  27. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  28. GRB 060403: Swift detection of a burst
  29. GRB060331: Swift/UVOT upper limits
  30. Swift XRT observations of the HETE transient H4043
  31. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  32. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  33. SGR 1900+14: Swift-BAT detection of a bright outburst
  34. GRB 060323 : WIDGET simultaneous optical observations
  35. GRB 060322: Confirmation of Swift XRT afterglow
  36. GRB 060211A: optical observation
  37. GRB060323: optical limit
  38. GRB060211B: optical observation
  39. SGR 1900+14: CORRECTION to GCN 4923
  40. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  41. SGR 1900+14: Swift detection of renewed activity
  42. GRB060323: NOT optical observations
  43. GRB 060322: IAC80 optical observations
  44. GRB 060322: Swift XRT afterglow candidate
  45. GRB060323: P60 Observations
  46. GRB 060323: Swift/UVOT Observations
  47. GRB 060323: optical afterglow confirmed
  48. GRB060323: NOT observations
  49. GRB 060323: Refined analysis of the Swift-BAT burst
  50. GRB 060323: optical observations at TNG
  51. GRB 060323: Swift XRT refined analysis
  52. GRB 060323: Swift/XRT position
  53. GRB 060322: Refined analysis of the Swift-BAT burst
  54. GRB060323 - SDSS Pre-Burst Observations
  55. GRB 060323: Swift detection of a burst with a possible optical afterglow
  56. GRB 060322: Swift-BAT detection of a 200-sec burst
  57. GRB060219: optical observation
  58. GRB060206: optical observation
  59. GRB 060319: WHT K-band candidate afterglow
  60. GRB 060319: IAC-80 optical observations
  61. GRB060319: Swift XRT refined analysis
  62. GRB060319: Swift/UVOT upper limits
  63. GRB060319: MASTER limit
  64. GRB 060319: Swift-BAT refined analysis
  65. GRB 060319 optical observations at TNG
  66. GRB060319 : Liverpool Telescope optical limit
  67. GRB060319: Swift/XRT position
  68. GRB 060319: Swift detection of a burst
  69. GRB 060313: early afterglow NIR upper limits with REM
  70. Konus-Wind observation of GRB 060313
  71. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  72. GRB 060313: Swift/UVOT Observations
  73. GRB 060313: Swift-XRT team refined analysis
  74. GRB060313: optical observations of the afterglow candidate
  75. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  76. GRB 060313: Swift XRT position
  77. GRB060313: optical and near infrared observations with REM
  78. GRB 060313: Swift-BAT detection of a bright short hard burst
  79. GRB060312: Swift UVOT observation
  80. GRB 060312: Refined analysis of the Swift-BAT burst
  81. GRB 060312: Swift XRT team refined analysis
  82. GRB060306: APO Ks-band Imaging Observations
  83. GRB 060312: ROTSE-III Optical Limits
  84. GRB 060312: Swift detection of a burst
  85. GRB 060306: SOAR Ks Observations
  86. Bright short hard GRB 060303: IPN localization and Konus spectrum
  87. GRB060219: Liverpool Telescope observations
  88. GRB 060306: MAGNUM observations
  89. GRB060218: analysis of the XMM-Newton observation
  90. Swift/UVOT observations of GRB060306
  91. GRB 060306: Swift-BAT refined analysis
  92. GRB 060306: Swift-XRT team refined analysis
  93. GRB 060306: Swift detection of a bright burst
  94. GRB060218: Ep,i - Eiso correlation
  95. GRB060223b: optical limit
  96. GRB 060223b: Swift/UVOT Upper Limits
  97. GRB 060223B: Swift XRT possible afterglow
  98. GRB 060223B: Swift-BAT refined analysis
  99. GRB 060223a: Swift/UVOT refined analysis
  100. GRB 060223: Swift XRT Team preliminary analysis

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