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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"

28051 results found.

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

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