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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"

28056 results found.

  1. GRB050319: radio observation
  2. GRB 050319: Swift-UVOT detection of the afterglow
  3. GRB 050315: Variability Analysis of Swift BAT Time History
  4. GRB050319: Radio Observations
  5. GRB 050319: NIR afterglow candidate
  6. GRB 050319:Near IR afterglow
  7. GRB 050318: SWIFT-UVOT refined analysis
  8. GRB 050319 : Confirmation of optical afterglow decay
  9. GRB 050319: Swift-BAT refined analysis
  10. GRB050319,optical observation
  11. GRB 050318: Swift/UVOT detection of afterglow emission
  12. RXTE Observations of GRB050318
  13. GRB050223: analysis of the XMM-Newton observation
  14. GRB050316: MASTER before, simultanious and follow up optical
  15. GRB 050306: ROTSE-III early limits
  16. GRB050316: MASTER optical observations
  17. GRB 050315: Swift-BAT further refined analysis
  18. GRB 050315 I-band observations
  19. GRB050315: Radio afterglow
  20. GRB050315: Swift-BAT Refined analysis
  21. Non-detection of GRB050315 in ATCA Radio Observations
  22. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  23. GRB 050315: Early Observations with Swift/UVOT
  24. GRB 050306: Radio Observations
  25. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  26. GRB 050306: optical afterglow
  27. Swift-BAT trigger 107873: No Swift XRT counterpart
  28. GRB 050306: Confirmation of X-ray afterglow
  29. GRB 050306: further TAROT optical data
  30. GRB050309: Early optical limit from P60
  31. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  32. GRB 050309 : Lulin R-band observation
  33. Swift 107873: P60 Optical Observations
  34. GRB 050306: R-band observations
  35. GRB 050306: REM optical-infrared observations
  36. GRB 050306: Possible X-ray Afterglow Position from the Swift
  37. GRB 050306: TAROT optical observations
  38. GRB 050306,optical observation
  39. Ongoing activity of SGR 1806-20 after the giant flare
  40. GRB050215B: Late-Time Swift UVOT Observations
  41. PROMPT VRcIc Observations of GRB 050223
  42. XRF/GRB 050215B: Radio Observations
  43. XMM-Newton Images of GRB 050223
  44. GRB 050219b: candidate NIR afterglow
  45. Confirmed XRF nature for GRB050215b
  46. GRB050223 XMM-Newton observation
  47. INTEGRAL detection of GRB 050223
  48. GRB050223: ROTSE-III Optical Observations
  49. GRB 050223 Swift/BAT detection of a burst
  50. GRB 050223: Swift XRT Position
  51. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  52. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  53. GRB 050219a: Optical observations from LCO
  54. GRB 050219b: Optical and near-IR observations from LCO
  55. GRB 050219b: Swift-BAT detection of a burst
  56. GRB 050219b: CORRECTION: Swift XRT Position
  57. GRB 050219b: Swift XRT Position
  58. GRB 050219: Swift-BAT detection of a burst
  59. GRB 050215b: XRT confirmation of IR afterglow candidate
  60. GRB050215b: P60 Optical Observations
  61. GRB 050215b: Swift XRT Source Variability
  62. GRB 050215B: candidate afterglow
  63. GRB 050215b : Lulin follow-up observation
  64. GRB 050215b, BOOTES-2 simultaneous optical observations
  65. GRB050215A: ROTSE-III Optical Observations
  66. GRB050209: TAROT optical observations
  67. GRB 050209(=U11568): Duration and spectrum
  68. GRB050209: REM optical observations
  69. GRB 050209 I-band observation
  70. GRB 050209 Optical observations
  71. GRB050209: P60 Optical Observations
  72. GRB 050128: Radio observations
  73. Further analysis of the short Swift-BAT GRB 050202
  74. GRB 050202: Short burst detected by Swift-BAT
  75. GRB 050128 Optical observation with REM
  76. SGR1806-20: Swift-BAT detection of a large normal burst
  77. GRB 050128: near-infrared observations with REM
  78. GRB050128,optical observations
  79. GRB050128 Swift-BAT observations
  80. GRB 050128: Swift XRT prompt afterglow position
  81. GRB050126: MASTER optical limit for KECK OT
  82. GRB050126: Burst Parameters Measured by BAT
  83. GRB050126: MASTER optical observations
  84. GRB 050124 I-band observation
  85. GRB050124,optical observation
  86. GRB 050124 : Lulin R-band follow-up observation
  87. GRB050124: Updated Swift XRT Position and Fluxes
  88. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  89. GRB050124: Refined BAT position, spectral and fluence information
  90. GRB 050123 : I-band follow-up observation
  91. GRB050123,optical observation
  92. GRB 050123: KAIT observations
  93. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  94. GRB050117: Refined XRT position
  95. GRB050117: MASTER optical observations
  96. MASTER:GRB050117 SWIFT
  97. GRB050117: Swift XRT Position
  98. Triangulation of Short Hard GRB050112 (large error box)
  99. SGR 1806-20: Further VLA Observations
  100. SGR1806-20: Swift-BAT observations of two additional bursts

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