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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"

45708 results found.

  1. GRB 050331: Swift UVOT Source
  2. Swift-BAT detection of GRB 050331
  3. GRB 050331: Swift XRT Position
  4. Swift Data Publicly Available Starting April 5, 2005
  5. GRB050319: radio observation
  6. Konus-Wind observation of GRB 050326
  7. GRB050326: optical limit
  8. GRB 050326: Early observations with Swift-UVOT
  9. GRB 050326 XMM-Newton observation
  10. GRB 050326 : Planned XMM-Newton observation
  11. GRB 050326: Swift XRT Position
  12. GRB050326: optical limit 33min before GRB
  13. GRB 050326 BAT refined analysis
  14. GRB050326: delayed XRT observation
  15. Swift-BAT detection of a bright GRB 050326
  16. GRB050319, optical observations
  17. GRB050319, color indices
  18. GRB050319: optical observation, March 20-22
  19. Swift-BAT detection of a bright outburst from SGR1806-20
  20. Swift-BAT trigger 112060 is not a real GRB
  21. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  22. GRB 050319: ROTSE-III Refined Analysis
  23. GRB 050318: Swift-BAT refined analysis
  24. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  25. GRB050319: VLA Observations
  26. GRB050319: radio observation
  27. GRB 050319 R band observations
  28. GRB 050319: Swift-UVOT detection of the afterglow
  29. GRB 050315: Variability Analysis of Swift BAT Time History
  30. GRB050319: Radio Observations
  31. GRB 050319: NIR afterglow candidate
  32. GRB 050319:Near IR afterglow
  33. GRB050319: BR optical photometry
  34. GRB 050318: SWIFT-UVOT refined analysis
  35. GRB 050318: Absorption redshift from Magellan
  36. GRB 050319: Optical observation
  37. GRB 050319 : Confirmation of optical afterglow decay
  38. GRB 050319: Swift-BAT refined analysis
  39. GRB050319,optical observation
  40. Swift Detection of GRB 050319
  41. GRB 050319: Detection of Possible Optical Counterpart
  42. GRB 050318: Swift/UVOT detection of afterglow emission
  43. GRB 050318: Magellan optical afterglow identification
  44. GRB050318: Swift XRT position
  45. RXTE Observations of GRB050318
  46. Swift-BAT detection of GRB 050318
  47. GRB 050315, SMARTS optical afterglow decay
  48. GRB050223: analysis of the XMM-Newton observation
  49. GRB050316: MASTER before, simultanious and follow up optical
  50. GRB 050306: ROTSE-III early limits
  51. GRB050316: MASTER optical observations
  52. GRB 050315: Swift-BAT further refined analysis
  53. GRB 050315, SMARTS optical/IR afterglow observations
  54. GRB 050315 I-band observations
  55. GRB050315: Radio afterglow
  56. GRB 050315: Absorption redshift
  57. GRB 050315: Optical afterglow identification
  58. GRB050315: Swift-BAT Refined analysis
  59. Non-detection of GRB050315 in ATCA Radio Observations
  60. GRB 050315: Swift XRT Position
  61. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  62. GRB 050315: Early Observations with Swift/UVOT
  63. Swift-BAT detection of GRB 050315
  64. GRB050223: No XMM-Newton OM detection of afterglow emission
  65. GRB 050306: Radio Observations
  66. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  67. GRB050309: CONCAM pre-trigger and trigger coincident optical
  68. GRB 050306: optical afterglow
  69. GRB 050126: Redshift determination
  70. Swift-BAT trigger 107873: No Swift XRT counterpart
  71. GRB 050306: Confirmation of X-ray afterglow
  72. GRB 050309, Early optical limits from RAPTOR
  73. GRB 050306: further TAROT optical data
  74. GRB050309: Early optical limit from P60
  75. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  76. GRB 050309 : Lulin R-band observation
  77. Swift 107873: P60 Optical Observations
  78. GRB 050306: CORRECTION to date of observation
  79. GRB 050306: R-band observations
  80. GRB 050306: No Swift UVOT Optical Counterpart Detected
  81. GRB 050306: REM optical-infrared observations
  82. GRB 050306: Possible X-ray Afterglow Position from the Swift
  83. Swift trigger 107518: optical observation
  84. GRB 050306: TAROT optical observations
  85. GRB 050306,optical observation
  86. GRB 050306: Swift-BAT detection of a long burst
  87. Ongoing activity of SGR 1806-20 after the giant flare
  88. GRB050215B: Late-Time Swift UVOT Observations
  89. GRB 050126: Confirmation of the NIR afterglow candidate
  90. PROMPT VRcIc Observations of GRB 050223
  91. XRF/GRB 050215B: Radio Observations
  92. XMM-Newton Images of GRB 050223
  93. GRB 050219b: candidate NIR afterglow
  94. IBAS GRB Alert #2321
  95. Confirmed XRF nature for GRB050215b
  96. GRB 050223: optical observations
  97. GRB050223 XMM-Newton observation
  98. INTEGRAL detection of GRB 050223
  99. GRB 050223 : Planned XMM-Newton observation
  100. GRB050223: No Swift UVOT Detection of Afterglow Emission

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