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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"

27813 results found.

  1. OT 060420: Likely Not a New Cosmic Transient
  2. Swift-BAT detection of Mrk 421
  3. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  4. GRB060421: Swift/UVOT observations
  5. GRB 060421: Swift-BAT Refined Analysis
  6. GRB 060421: Swift-XRT refined analysis
  7. GRB 060418: prediction of t_break
  8. Konus-Wind observation of GRB 060418
  9. GRB(?)060421:MASTER optical limit
  10. GRB(?)060421 : XRT position
  11. Possible GRB060421: BART limits
  12. GRB(?) 060421: Swift detection of a burst
  13. GRB 060418: Radio Observations
  14. GRB060418: Swift/UVOT Observations
  15. GRB 060418: FRAM early afterglow observation
  16. GRB 060418: Refined Analysis of the Swift-BAT burst
  17. VLT/UVES observations of GRB060418
  18. GRB060418: Swift XRT Team Refined Analysis
  19. GRB060418: Magellan/MIKE Spectroscopic Redshift
  20. GRB060418 : LT optical afterglow observation
  21. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  22. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  23. GRB060413: Swift/UVOT upper limits
  24. SGR 1900+14: Swift detection of an outburst
  25. GRB 060413: Refined analysis of the Swift-BAT burst
  26. GRB 060413: XRT refined analysis
  27. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  28. GRB 060413: Swift detection of a burst
  29. GRB060403: Optical Limit
  30. GRB060403: XRT refined analysis
  31. GRB 060403: Swift/UVOT upper limits
  32. SGR 1900+14: BAT observations
  33. GRB 060403: Refined analysis of the Swift-BAT burst
  34. GRB060403: Swift XRT refined position
  35. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  36. GRB 060403: Swift detection of a burst
  37. GRB060331: Swift/UVOT upper limits
  38. Swift XRT observations of the HETE transient H4043
  39. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  40. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  41. SGR 1900+14: Swift-BAT detection of a bright outburst
  42. GRB 060323 : WIDGET simultaneous optical observations
  43. GRB 060322: Confirmation of Swift XRT afterglow
  44. GRB060323: optical limit
  45. SGR 1900+14: CORRECTION to GCN 4923
  46. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  47. SGR 1900+14: Swift detection of renewed activity
  48. GRB060323: NOT optical observations
  49. GRB 060322: IAC80 optical observations
  50. GRB 060322: Swift XRT afterglow candidate
  51. GRB 060323: Swift/UVOT Observations
  52. GRB060323: NOT observations
  53. GRB 060323: Refined analysis of the Swift-BAT burst
  54. GRB 060323: Swift XRT refined analysis
  55. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  56. GRB 060323: Swift/XRT position
  57. GRB 060322: Refined analysis of the Swift-BAT burst
  58. GRB060323 - SDSS Pre-Burst Observations
  59. GRB 060323: Swift detection of a burst with a possible optical afterglow
  60. GRB 060322: Swift-BAT detection of a 200-sec burst
  61. GRB 060319: IAC-80 optical observations
  62. GRB060319: Swift XRT refined analysis
  63. GRB060319: Swift/UVOT upper limits
  64. GRB 060319: Swift-BAT refined analysis
  65. GRB060319 : Liverpool Telescope optical limit
  66. GRB060319: Swift/XRT position
  67. GRB 060319: Swift detection of a burst
  68. Konus-Wind observation of GRB 060313
  69. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  70. GRB 060313: PROMPT Observations
  71. GRB 060313: Swift/UVOT Observations
  72. GRB 060313: Swift-XRT team refined analysis
  73. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  74. GRB 060313, SMARTS optical counterpart?
  75. GRB 060313: Swift XRT position
  76. GRB 060313, SMARTS optical/IR observations
  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. Bright short hard GRB 060303: IPN localization and Konus spectrum
  86. GRB060218: analysis of the XMM-Newton observation
  87. Swift/UVOT observations of GRB060306
  88. GRB 060306: Swift-BAT refined analysis
  89. GRB 060306: Swift-XRT team refined analysis
  90. GRB 060306: Swift detection of a bright burst
  91. GRB060218: Ep,i - Eiso correlation
  92. GRB 060223b: Swift/UVOT Upper Limits
  93. GRB 060223B: Swift XRT possible afterglow
  94. GRB 060218/SN 2006aj: ABT observations
  95. GRB 060223A:Xinglong optical limits
  96. GRB 060223B: Swift-BAT refined analysis
  97. GRB 060223a: Swift/UVOT refined analysis
  98. GRB 060223: Swift XRT Team preliminary analysis
  99. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  100. GRB 060223B: Swift detection of a bright burst

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