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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

11394 results found.

  1. GRB 050918 - A long GRB detected by INTEGRAL
  2. Swift-BAT trigger 155535 is definitely not a GRB
  3. GRB 050916: XRT position
  4. GRB050916: Swift-BAT detection of a long weak burst
  5. GRB 050915B: XRT position
  6. GRB050915B: Swift-BAT detection of a long bright burst
  7. GRB 050915: Swift-BAT refined analysis
  8. GRB050915: P60 Optical Observations
  9. GRB 050915: ROTSE-III optical limits
  10. Swift is in normal operation
  11. GRB 050911: Swift-BAT refined analysis
  12. GRB 050911: z~0.16 cluster in the field
  13. GRB050911: Swift-BAT detection of a long burst
  14. GRB 050910a: TAROT early optical limits
  15. GRB 050906: Possible X-ray Counterpart
  16. GRB 050908: Swift-BAT refined analysis
  17. GRB 050908: Optical observations
  18. GRB 050908: Prompt PROMPT Observations
  19. Swift trigger 154073 is not a GRB
  20. GRB050904: CrAO optical observations
  21. GRB 050906: Swift-BAT refined analysis
  22. GRB 050906: Radio Observations
  23. GRB 050906: Bright galaxy in BAT error box
  24. GRB 050904: Swift/UVOT observations
  25. GRB 050904: early Swift XRT analysis results
  26. GRB 050827: P200 NIR Observations
  27. GRB050824, HETE-2 Observation
  28. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  29. GRB050824, I-band imaging
  30. GRB 050822: refined XRT analysis
  31. GRB 050824: XRT refined analysis and possible afterglow detection
  32. GRB 050824: ROTSE-III Optical Limits
  33. GRB050820A: RTT150 optical observations
  34. GRB 050822: Swift-BAT refined analysis
  35. GRB050820A: RTT150 optical observations
  36. GRB 050820a - corrections to GCN 3846
  37. GRB 050822: ROTSE-III Prompt Optical Limits
  38. GRB050820B: BAT-Swift detection of a bright GRB
  39. GRB 050820: High Resolution Spectroscopy from Keck
  40. GRB 050820: Swift detection of a GRB
  41. Swift-BAT trigger 150993 is not a GRB
  42. GRB 050815: ROTSE-III Optical Limits
  43. GRB050814: Fading red source
  44. GRB050814: P60 Optical Afterglow Candidate
  45. GRB 050814: XRT refined analysis
  46. GRB050814: Refined analysis of the Swift-BAT burst
  47. GRB 050814: Swift XRT Afterglow Localization
  48. GRB050813: RTT150 optical observations
  49. GRB 050813: KAIT optical limit
  50. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  51. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  52. Detection of an intermediate burst from SGR 1806-20 on August 8
  53. GRB 050807: ROTSE-III Optical Limits
  54. GRB050803, optical observations
  55. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  56. GRB 050803: RTT150 optical observations
  57. GRB050803: CrAO optical observations, possible OT candidate
  58. GRB 050803: Swift-BAT refined analysis
  59. GRB050803: MASTER further analys
  60. GRB 050803: early Swift XRT analysis results
  61. GCN GRB observation 050713A
  62. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  63. GRB050802: CrAO optical observations
  64. GRB 050802: Swift Gamma-ray Burst
  65. GRB 050801: Swift-BAT refined analysis
  66. GRB 050730, corrected photometry and break?
  67. GRB050730: Refined BAT analysis of the Swift-BAT burst
  68. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  69. GRB050730: Liverpool Telescope optical observations
  70. GRB 050730, optical candidate
  71. GRB050730: Swift-BAT detection of a weak burst
  72. GRB050713b: Maidanak optical observations
  73. GRB 050724: Chandra Observations of the X-ray Afterglow
  74. GRB 050724, SMARTS optical/IR afterglow observations
  75. GRB 050726, SMARTS optical/IR observations
  76. GRB 050724: J-band observations
  77. GRB 050724: SWIFT XRT refined position
  78. GRB050721A: Swift-BAT detection of a weak burst
  79. GRB 050712, Tautenburg optical afterglow observations
  80. Konus-Wind observation of GRB 050717
  81. Swift detection of GRB 050717
  82. Konus-Wind observation of GRB 050713A
  83. GRB 050714, R-band candidate
  84. GRB 050714A: ROTSE-III Optical Limits
  85. GRB 050714 - A long GRB detected with INTEGRAL
  86. GRB 050712, optical observations
  87. GRB050709: Candidate X-ray Afterglow from Chandra
  88. GRB 050713: Swift detection of Bright Burst
  89. GRB 050713A: ROTSE-III Optical Limits
  90. GRB050709: Radio Observations
  91. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  92. GRB 050626 optical observations
  93. GRB 050626: Swift XRT observations
  94. GRB 050408: ARC 3.5-meter NIR Observations
  95. GRB050701: Swift-BAT Refined analysis
  96. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  97. GRB 050626 - a long GRB detected with INTEGRAL
  98. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  99. Konus-Wind observation of an intermediate burst from SGR 1806-20
  100. GRB 050607: Optical decay and spectral slope

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