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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"

19635 results found.

  1. GRB060331: Swift/UVOT upper limits
  2. Swift XRT observations of the HETE transient H4043
  3. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  4. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  5. SGR 1900+14: Swift-BAT detection of a bright outburst
  6. GRB 060323 : WIDGET simultaneous optical observations
  7. GRB 060322: Confirmation of Swift XRT afterglow
  8. GRB060323: optical limit
  9. SGR 1900+14: CORRECTION to GCN 4923
  10. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  11. SGR 1900+14: Swift detection of renewed activity
  12. GRB060323: NOT optical observations
  13. GRB 060322: IAC80 optical observations
  14. GRB 060322: Swift XRT afterglow candidate
  15. GRB 060323: Swift/UVOT Observations
  16. GRB060323: NOT observations
  17. GRB 060323: Refined analysis of the Swift-BAT burst
  18. GRB 060323: Swift XRT refined analysis
  19. GRB 060323: Swift/XRT position
  20. GRB 060322: Refined analysis of the Swift-BAT burst
  21. GRB060323 - SDSS Pre-Burst Observations
  22. GRB 060323: Swift detection of a burst with a possible optical afterglow
  23. GRB 060322: Swift-BAT detection of a 200-sec burst
  24. GRB 060319: IAC-80 optical observations
  25. GRB060319: Swift XRT refined analysis
  26. GRB060319: Swift/UVOT upper limits
  27. GRB 060319: Swift-BAT refined analysis
  28. GRB060319: Swift/XRT position
  29. GRB 060319: Swift detection of a burst
  30. Konus-Wind observation of GRB 060313
  31. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  32. GRB 060313: Swift/UVOT Observations
  33. GRB 060313: Swift-XRT team refined analysis
  34. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  35. GRB 060313: Swift XRT position
  36. GRB060313: optical and near infrared observations with REM
  37. GRB 060313: Swift-BAT detection of a bright short hard burst
  38. GRB060312: Swift UVOT observation
  39. GRB 060312: Refined analysis of the Swift-BAT burst
  40. GRB 060312: Swift XRT team refined analysis
  41. GRB060306: APO Ks-band Imaging Observations
  42. GRB 060312: ROTSE-III Optical Limits
  43. GRB 060312: Swift detection of a burst
  44. Bright short hard GRB 060303: IPN localization and Konus spectrum
  45. GRB060218: analysis of the XMM-Newton observation
  46. Swift/UVOT observations of GRB060306
  47. GRB 060306: Swift-BAT refined analysis
  48. GRB 060306: Swift-XRT team refined analysis
  49. GRB 060306: Swift detection of a bright burst
  50. GRB060218: Ep,i - Eiso correlation
  51. GRB 060223b: Swift/UVOT Upper Limits
  52. GRB 060223B: Swift XRT possible afterglow
  53. GRB 060223B: Swift-BAT refined analysis
  54. GRB 060223a: Swift/UVOT refined analysis
  55. GRB 060223: Swift XRT Team preliminary analysis
  56. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  57. GRB 060223B: Swift detection of a bright burst
  58. GRB 060223: Swift-BAT refined analysis
  59. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  60. GRB 060223: Swift detection of a burst
  61. GRB 060219: Swift-BAT refined analysis
  62. GRB 060218: Further refined analysis of the Swift-BAT burst
  63. GRB 060218: Likely an underluminous GRB
  64. GRB 060219: SDSS galaxy inside XRT error circle
  65. GRB060218: UV Detection and Light Curves
  66. GRB 060219: Swift/UVOT Upper Limits
  67. GRB 060219: Swift-XRT Team refined analysis
  68. GRB 051221B: Swift-XRT Team Refined Analysis
  69. GRB 060219: Partial refined analysis of the Swift-BAT burst
  70. GRB 060219: Swift-XRT position typo correction
  71. GRB 060219: Swift-XRT position
  72. GRB 060218: optical/nIR observations at La Palma
  73. GRB 060219: Swift-BAT detection of a weak burst
  74. Oddball GRB 060218, transient or GRB?
  75. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  76. Brightening of the Optical Counterpart of the Possible GRB 060218
  77. GRB 060218: MDM Observations
  78. GRB 060218A: ROTSE-III Possible Optical Flare
  79. GRB060218: Swift/XRT refined position of a possible burst
  80. Preliminary refined analysis of the Swift-BAT trigger 191157
  81. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  82. GRB 060211B: Swift/UVOT Upper Limits
  83. GRB 060218: Swift XRT Position
  84. GRB 060218: Swift-BAT detection of a possible burst
  85. GRB 060213: optical afterglow not confirmed
  86. Swift UVOT observations of GRB060213
  87. GRB060213: Swift XRT observations and possible afterglow candidate
  88. GRB 060211b: WIRO NIR Observations
  89. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  90. GRB 060213: IPN localization
  91. GRB 060211a: WIRO NIR Observations
  92. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  93. GRB 060211A: Further refined analysis of the Swift burst
  94. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  95. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  96. GRB 050826: Optical Afterglow and Host Galaxy
  97. GRB 060210: Further refined analysis of the Swift-BAT burst
  98. GRB 060211B: Swift/BAT refined analysis
  99. GRB060210: Swift/UVOT Upper Limits
  100. GRB 060211B: Swift-XRT Team refined analysis

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