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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"

28053 results found.

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

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