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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"

28052 results found.

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

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