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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"

28050 results found.

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

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