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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"

28229 results found.

  1. GRB 050306: Confirmation of X-ray afterglow
  2. GRB 050306: further TAROT optical data
  3. GRB050309: Early optical limit from P60
  4. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  5. GRB 050309 : Lulin R-band observation
  6. Swift 107873: P60 Optical Observations
  7. GRB 050306: R-band observations
  8. GRB 050306: REM optical-infrared observations
  9. GRB 050306: Possible X-ray Afterglow Position from the Swift
  10. GRB 050306: TAROT optical observations
  11. GRB 050306,optical observation
  12. Ongoing activity of SGR 1806-20 after the giant flare
  13. GRB050215B: Late-Time Swift UVOT Observations
  14. PROMPT VRcIc Observations of GRB 050223
  15. XRF/GRB 050215B: Radio Observations
  16. XMM-Newton Images of GRB 050223
  17. GRB 050219b: candidate NIR afterglow
  18. Confirmed XRF nature for GRB050215b
  19. GRB050223 XMM-Newton observation
  20. INTEGRAL detection of GRB 050223
  21. GRB050223: ROTSE-III Optical Observations
  22. GRB 050223 Swift/BAT detection of a burst
  23. GRB 050223: Swift XRT Position
  24. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  25. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  26. GRB 050219a: Optical observations from LCO
  27. GRB 050219b: Optical and near-IR observations from LCO
  28. GRB 050219b: Swift-BAT detection of a burst
  29. GRB 050219b: CORRECTION: Swift XRT Position
  30. GRB 050219b: Swift XRT Position
  31. GRB 050219: Swift-BAT detection of a burst
  32. GRB 050215b: XRT confirmation of IR afterglow candidate
  33. GRB050215b: P60 Optical Observations
  34. GRB 050215b: Swift XRT Source Variability
  35. GRB 050215B: candidate afterglow
  36. GRB 050215b : Lulin follow-up observation
  37. GRB 050215b, BOOTES-2 simultaneous optical observations
  38. GRB050215A: ROTSE-III Optical Observations
  39. GRB050209: TAROT optical observations
  40. GRB 050209(=U11568): Duration and spectrum
  41. GRB050209: REM optical observations
  42. GRB 050209 I-band observation
  43. GRB 050209 Optical observations
  44. GRB050209: P60 Optical Observations
  45. GRB 050128: Radio observations
  46. Further analysis of the short Swift-BAT GRB 050202
  47. GRB 050202: Short burst detected by Swift-BAT
  48. GRB 050128 Optical observation with REM
  49. SGR1806-20: Swift-BAT detection of a large normal burst
  50. GRB 050128: near-infrared observations with REM
  51. GRB050128,optical observations
  52. GRB050128 Swift-BAT observations
  53. GRB 050128: Swift XRT prompt afterglow position
  54. GRB050126: MASTER optical limit for KECK OT
  55. GRB050126: Burst Parameters Measured by BAT
  56. GRB050126: MASTER optical observations
  57. GRB 050124 I-band observation
  58. GRB050124,optical observation
  59. GRB 050124 : Lulin R-band follow-up observation
  60. GRB050124: Updated Swift XRT Position and Fluxes
  61. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  62. GRB050124: Refined BAT position, spectral and fluence information
  63. GRB 050123 : I-band follow-up observation
  64. GRB050123,optical observation
  65. GRB 050123: KAIT observations
  66. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  67. GRB050117: Refined XRT position
  68. GRB050117: MASTER optical observations
  69. MASTER:GRB050117 SWIFT
  70. GRB050117: Swift XRT Position
  71. Triangulation of Short Hard GRB050112 (large error box)
  72. SGR 1806-20: Further VLA Observations
  73. SGR1806-20: Swift-BAT observations of two additional bursts
  74. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  75. Further VLA observations of SGR 1806-20
  76. SGR 1806-20 and extragalactic short-duration GRBs
  77. Further ATCA observations of SGR 1806-20
  78. Fourth Epoch VLA observations of SGR 1806-20
  79. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  80. ATCA observations of SGR 1806-20
  81. SGR 1806-20, RHESSI observations of the 041227 giant flare
  82. Third epoch observations of SGR 1806-20 with VLA
  83. Second Epoch VLA observations of SGR 1806-20
  84. Second-epoch VLA observations of SGR 1806-20
  85. SGR1806 VLA Observations
  86. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  87. GRB 041217: Optical observations
  88. GRB041228: Swift-BAT detection of a burst
  89. GRB041219; RXTE ASM Observations
  90. NIR Observations of GRB 041219
  91. GRB041226: Swift-BAT detection of a burst
  92. GRB041223: decay of the afterglow
  93. GRB 041224: near-infrared observations with REM
  94. GRB 041223 Fluence measured by Swift-BAT
  95. GRB041223: optical and NIR observations with REM
  96. Swift-BAT Time History of GRB041219
  97. GRB 041219: TAROT optical observations
  98. GRB 041218: TAROT optical observations
  99. GRB 041223: J-band observations of the afterglow
  100. GRB 041219c: PROMPT Observations

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