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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"

28043 results found.

  1. GRB050316: MASTER before, simultanious and follow up optical
  2. GRB 050306: ROTSE-III early limits
  3. GRB050316: MASTER optical observations
  4. GRB 050315: Swift-BAT further refined analysis
  5. GRB 050315 I-band observations
  6. GRB050315: Radio afterglow
  7. GRB050315: Swift-BAT Refined analysis
  8. Non-detection of GRB050315 in ATCA Radio Observations
  9. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  10. GRB 050315: Early Observations with Swift/UVOT
  11. GRB 050306: Radio Observations
  12. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  13. GRB 050306: optical afterglow
  14. Swift-BAT trigger 107873: No Swift XRT counterpart
  15. GRB 050306: Confirmation of X-ray afterglow
  16. GRB 050306: further TAROT optical data
  17. GRB050309: Early optical limit from P60
  18. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  19. GRB 050309 : Lulin R-band observation
  20. Swift 107873: P60 Optical Observations
  21. GRB 050306: R-band observations
  22. GRB 050306: REM optical-infrared observations
  23. GRB 050306: Possible X-ray Afterglow Position from the Swift
  24. GRB 050306: TAROT optical observations
  25. GRB 050306,optical observation
  26. Ongoing activity of SGR 1806-20 after the giant flare
  27. GRB050215B: Late-Time Swift UVOT Observations
  28. PROMPT VRcIc Observations of GRB 050223
  29. XRF/GRB 050215B: Radio Observations
  30. XMM-Newton Images of GRB 050223
  31. GRB 050219b: candidate NIR afterglow
  32. Confirmed XRF nature for GRB050215b
  33. GRB050223 XMM-Newton observation
  34. INTEGRAL detection of GRB 050223
  35. GRB050223: ROTSE-III Optical Observations
  36. GRB 050223 Swift/BAT detection of a burst
  37. GRB 050223: Swift XRT Position
  38. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  39. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  40. GRB 050219a: Optical observations from LCO
  41. GRB 050219b: Optical and near-IR observations from LCO
  42. GRB 050219b: Swift-BAT detection of a burst
  43. GRB 050219b: CORRECTION: Swift XRT Position
  44. GRB 050219b: Swift XRT Position
  45. GRB 050219: Swift-BAT detection of a burst
  46. GRB 050215b: XRT confirmation of IR afterglow candidate
  47. GRB050215b: P60 Optical Observations
  48. GRB 050215b: Swift XRT Source Variability
  49. GRB 050215B: candidate afterglow
  50. GRB 050215b : Lulin follow-up observation
  51. GRB 050215b, BOOTES-2 simultaneous optical observations
  52. GRB050215A: ROTSE-III Optical Observations
  53. GRB050209: TAROT optical observations
  54. GRB 050209(=U11568): Duration and spectrum
  55. GRB050209: REM optical observations
  56. GRB 050209 I-band observation
  57. GRB 050209 Optical observations
  58. GRB050209: P60 Optical Observations
  59. GRB 050128: Radio observations
  60. Further analysis of the short Swift-BAT GRB 050202
  61. GRB 050202: Short burst detected by Swift-BAT
  62. GRB 050128 Optical observation with REM
  63. SGR1806-20: Swift-BAT detection of a large normal burst
  64. GRB 050128: near-infrared observations with REM
  65. GRB050128,optical observations
  66. GRB050128 Swift-BAT observations
  67. GRB 050128: Swift XRT prompt afterglow position
  68. GRB050126: MASTER optical limit for KECK OT
  69. GRB050126: Burst Parameters Measured by BAT
  70. GRB050126: MASTER optical observations
  71. GRB 050124 I-band observation
  72. GRB050124,optical observation
  73. GRB 050124 : Lulin R-band follow-up observation
  74. GRB050124: Updated Swift XRT Position and Fluxes
  75. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  76. GRB050124: Refined BAT position, spectral and fluence information
  77. GRB 050123 : I-band follow-up observation
  78. GRB050123,optical observation
  79. GRB 050123: KAIT observations
  80. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  81. GRB050117: Refined XRT position
  82. GRB050117: MASTER optical observations
  83. MASTER:GRB050117 SWIFT
  84. GRB050117: Swift XRT Position
  85. Triangulation of Short Hard GRB050112 (large error box)
  86. SGR 1806-20: Further VLA Observations
  87. SGR1806-20: Swift-BAT observations of two additional bursts
  88. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  89. Further VLA observations of SGR 1806-20
  90. SGR 1806-20 and extragalactic short-duration GRBs
  91. Further ATCA observations of SGR 1806-20
  92. Fourth Epoch VLA observations of SGR 1806-20
  93. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  94. ATCA observations of SGR 1806-20
  95. SGR 1806-20, RHESSI observations of the 041227 giant flare
  96. Third epoch observations of SGR 1806-20 with VLA
  97. Second Epoch VLA observations of SGR 1806-20
  98. Second-epoch VLA observations of SGR 1806-20
  99. SGR1806 VLA Observations
  100. SGR1806-20: RXTE-PCA observation of the 041227 super-flare

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