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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"

26362 results found.

  1. GRB050319, color indices
  2. GRB050319: optical observation, March 20-22
  3. GRB050319: RTT150 Optical Observations
  4. Swift-BAT trigger 112060 is not a real GRB
  5. GRB 050318: Swift-BAT refined analysis
  6. GRB050319: VLA Observations
  7. GRB050319: radio observation
  8. GRB 050319: Swift-UVOT detection of the afterglow
  9. GRB 050315: Variability Analysis of Swift BAT Time History
  10. GRB050319: Radio Observations
  11. GRB 050319: NIR afterglow candidate
  12. GRB 050319:Near IR afterglow
  13. GRB 050318: SWIFT-UVOT refined analysis
  14. GRB 050319 : Confirmation of optical afterglow decay
  15. GRB 050319: Swift-BAT refined analysis
  16. GRB050319,optical observation
  17. GRB 050318: Swift/UVOT detection of afterglow emission
  18. RXTE Observations of GRB050318
  19. GRB050223: analysis of the XMM-Newton observation
  20. GRB050316: MASTER before, simultanious and follow up optical
  21. GRB 050306: ROTSE-III early limits
  22. GRB050316: MASTER optical observations
  23. GRB 050315: Swift-BAT further refined analysis
  24. GRB 050315 I-band observations
  25. GRB050315: Radio afterglow
  26. GRB050315: Swift-BAT Refined analysis
  27. Non-detection of GRB050315 in ATCA Radio Observations
  28. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  29. GRB 050315: Early Observations with Swift/UVOT
  30. GRB 050306: Radio Observations
  31. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  32. GRB 050306: optical afterglow
  33. Swift-BAT trigger 107873: No Swift XRT counterpart
  34. GRB 050306: Confirmation of X-ray afterglow
  35. GRB 050306: further TAROT optical data
  36. GRB050309: Early optical limit from P60
  37. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  38. GRB 050309 : Lulin R-band observation
  39. Swift 107873: P60 Optical Observations
  40. GRB 050306: R-band observations
  41. GRB 050306: REM optical-infrared observations
  42. GRB 050306: Possible X-ray Afterglow Position from the Swift
  43. GRB 050306: TAROT optical observations
  44. GRB 050306,optical observation
  45. Ongoing activity of SGR 1806-20 after the giant flare
  46. GRB050215B: Late-Time Swift UVOT Observations
  47. PROMPT VRcIc Observations of GRB 050223
  48. XRF/GRB 050215B: Radio Observations
  49. XMM-Newton Images of GRB 050223
  50. GRB 050219b: candidate NIR afterglow
  51. Confirmed XRF nature for GRB050215b
  52. GRB050223 XMM-Newton observation
  53. INTEGRAL detection of GRB 050223
  54. GRB050223: ROTSE-III Optical Observations
  55. GRB 050223 Swift/BAT detection of a burst
  56. GRB 050223: Swift XRT Position
  57. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  58. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  59. GRB 050219a: Optical observations from LCO
  60. GRB 050219b: Optical and near-IR observations from LCO
  61. GRB 050219b: Swift-BAT detection of a burst
  62. GRB 050219b: CORRECTION: Swift XRT Position
  63. GRB 050219b: Swift XRT Position
  64. GRB 050219: Swift-BAT detection of a burst
  65. GRB 050215b: XRT confirmation of IR afterglow candidate
  66. GRB050215b: P60 Optical Observations
  67. GRB 050215b: Swift XRT Source Variability
  68. GRB 050215B: candidate afterglow
  69. GRB 050215b : Lulin follow-up observation
  70. GRB 050215b, BOOTES-2 simultaneous optical observations
  71. GRB050215A: ROTSE-III Optical Observations
  72. GRB050209: TAROT optical observations
  73. GRB 050209(=U11568): Duration and spectrum
  74. GRB050209: REM optical observations
  75. GRB 050209 I-band observation
  76. GRB 050209 Optical observations
  77. GRB050209: P60 Optical Observations
  78. GRB 050128: Radio observations
  79. Further analysis of the short Swift-BAT GRB 050202
  80. GRB 050202: Short burst detected by Swift-BAT
  81. GRB 050128 Optical observation with REM
  82. SGR1806-20: Swift-BAT detection of a large normal burst
  83. GRB 050128: near-infrared observations with REM
  84. GRB050128,optical observations
  85. GRB050128 Swift-BAT observations
  86. GRB 050128: Swift XRT prompt afterglow position
  87. GRB050126: MASTER optical limit for KECK OT
  88. GRB050126: Burst Parameters Measured by BAT
  89. GRB050126: MASTER optical observations
  90. GRB 050124 I-band observation
  91. GRB050124,optical observation
  92. GRB 050124 : Lulin R-band follow-up observation
  93. GRB050124: Updated Swift XRT Position and Fluxes
  94. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  95. GRB050124: Refined BAT position, spectral and fluence information
  96. GRB 050123 : I-band follow-up observation
  97. GRB050123,optical observation
  98. GRB 050123: KAIT observations
  99. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  100. GRB050117: Refined XRT position

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