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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"

28233 results found.

  1. GRB 050306: Radio Observations
  2. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  3. GRB 050306: optical afterglow
  4. Swift-BAT trigger 107873: No Swift XRT counterpart
  5. GRB 050306: Confirmation of X-ray afterglow
  6. GRB 050306: further TAROT optical data
  7. GRB050309: Early optical limit from P60
  8. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  9. GRB 050309 : Lulin R-band observation
  10. Swift 107873: P60 Optical Observations
  11. GRB 050306: R-band observations
  12. GRB 050306: REM optical-infrared observations
  13. GRB 050306: Possible X-ray Afterglow Position from the Swift
  14. GRB 050306: TAROT optical observations
  15. GRB 050306,optical observation
  16. Ongoing activity of SGR 1806-20 after the giant flare
  17. GRB050215B: Late-Time Swift UVOT Observations
  18. PROMPT VRcIc Observations of GRB 050223
  19. XRF/GRB 050215B: Radio Observations
  20. XMM-Newton Images of GRB 050223
  21. GRB 050219b: candidate NIR afterglow
  22. Confirmed XRF nature for GRB050215b
  23. GRB050223 XMM-Newton observation
  24. INTEGRAL detection of GRB 050223
  25. GRB050223: ROTSE-III Optical Observations
  26. GRB 050223 Swift/BAT detection of a burst
  27. GRB 050223: Swift XRT Position
  28. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  29. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  30. GRB 050219a: Optical observations from LCO
  31. GRB 050219b: Optical and near-IR observations from LCO
  32. GRB 050219b: Swift-BAT detection of a burst
  33. GRB 050219b: CORRECTION: Swift XRT Position
  34. GRB 050219b: Swift XRT Position
  35. GRB 050219: Swift-BAT detection of a burst
  36. GRB 050215b: XRT confirmation of IR afterglow candidate
  37. GRB050215b: P60 Optical Observations
  38. GRB 050215b: Swift XRT Source Variability
  39. GRB 050215B: candidate afterglow
  40. GRB 050215b : Lulin follow-up observation
  41. GRB 050215b, BOOTES-2 simultaneous optical observations
  42. GRB050215A: ROTSE-III Optical Observations
  43. GRB050209: TAROT optical observations
  44. GRB 050209(=U11568): Duration and spectrum
  45. GRB050209: REM optical observations
  46. GRB 050209 I-band observation
  47. GRB 050209 Optical observations
  48. GRB050209: P60 Optical Observations
  49. GRB 050128: Radio observations
  50. Further analysis of the short Swift-BAT GRB 050202
  51. GRB 050202: Short burst detected by Swift-BAT
  52. GRB 050128 Optical observation with REM
  53. SGR1806-20: Swift-BAT detection of a large normal burst
  54. GRB 050128: near-infrared observations with REM
  55. GRB050128,optical observations
  56. GRB050128 Swift-BAT observations
  57. GRB 050128: Swift XRT prompt afterglow position
  58. GRB050126: MASTER optical limit for KECK OT
  59. GRB050126: Burst Parameters Measured by BAT
  60. GRB050126: MASTER optical observations
  61. GRB 050124 I-band observation
  62. GRB050124,optical observation
  63. GRB 050124 : Lulin R-band follow-up observation
  64. GRB050124: Updated Swift XRT Position and Fluxes
  65. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  66. GRB050124: Refined BAT position, spectral and fluence information
  67. GRB 050123 : I-band follow-up observation
  68. GRB050123,optical observation
  69. GRB 050123: KAIT observations
  70. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  71. GRB050117: Refined XRT position
  72. GRB050117: MASTER optical observations
  73. MASTER:GRB050117 SWIFT
  74. GRB050117: Swift XRT Position
  75. Triangulation of Short Hard GRB050112 (large error box)
  76. SGR 1806-20: Further VLA Observations
  77. SGR1806-20: Swift-BAT observations of two additional bursts
  78. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  79. Further VLA observations of SGR 1806-20
  80. SGR 1806-20 and extragalactic short-duration GRBs
  81. Further ATCA observations of SGR 1806-20
  82. Fourth Epoch VLA observations of SGR 1806-20
  83. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  84. ATCA observations of SGR 1806-20
  85. SGR 1806-20, RHESSI observations of the 041227 giant flare
  86. Third epoch observations of SGR 1806-20 with VLA
  87. Second Epoch VLA observations of SGR 1806-20
  88. Second-epoch VLA observations of SGR 1806-20
  89. SGR1806 VLA Observations
  90. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  91. GRB 041217: Optical observations
  92. GRB041228: Swift-BAT detection of a burst
  93. GRB041219; RXTE ASM Observations
  94. NIR Observations of GRB 041219
  95. GRB041226: Swift-BAT detection of a burst
  96. GRB041223: decay of the afterglow
  97. GRB 041224: near-infrared observations with REM
  98. GRB 041223 Fluence measured by Swift-BAT
  99. GRB041223: optical and NIR observations with REM
  100. Swift-BAT Time History of GRB041219

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