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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"

37715 results found.

  1. Retraction of three Swift GRB triggers
  2. GRB050331: No Afterglow Detected
  3. Swift-BAT detection of GRB 050331b
  4. GRB 050331: Swift UVOT Source
  5. Swift-BAT detection of GRB 050331
  6. GRB 050331: Swift XRT Position
  7. GRB050319: radio observation
  8. Konus-Wind observation of GRB 050326
  9. GRB 050326: Early observations with Swift-UVOT
  10. GRB 050326 XMM-Newton observation
  11. GRB 050326 : Planned XMM-Newton observation
  12. GRB 050326: Swift XRT Position
  13. GRB050326: optical limit 33min before GRB
  14. GRB 050326 BAT refined analysis
  15. GRB050326: delayed XRT observation
  16. Swift-BAT detection of a bright GRB 050326
  17. GRB050319, color indices
  18. GRB050319: RTT150 Optical Observations
  19. Swift-BAT trigger 112060 is not a real GRB
  20. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  21. GRB 050319: ROTSE-III Refined Analysis
  22. GRB 050318: Swift-BAT refined analysis
  23. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  24. GRB050319: VLA Observations
  25. GRB 050319 R band observations
  26. GRB 050319: Swift-UVOT detection of the afterglow
  27. GRB 050315: Variability Analysis of Swift BAT Time History
  28. GRB050319: Radio Observations
  29. GRB 050319: NIR afterglow candidate
  30. GRB 050319:Near IR afterglow
  31. GRB 050318: SWIFT-UVOT refined analysis
  32. GRB 050318: Absorption redshift from Magellan
  33. GRB 050319: Optical observation
  34. GRB 050319 : Confirmation of optical afterglow decay
  35. GRB 050319: Swift-BAT refined analysis
  36. GRB050319,optical observation
  37. Swift Detection of GRB 050319
  38. GRB 050319: Detection of Possible Optical Counterpart
  39. GRB 050318: Swift/UVOT detection of afterglow emission
  40. GRB 050318: Magellan optical afterglow identification
  41. GRB050318: Swift XRT position
  42. RXTE Observations of GRB050318
  43. Swift-BAT detection of GRB 050318
  44. GRB 050315, SMARTS optical afterglow decay
  45. GRB050316: MASTER before, simultanious and follow up optical
  46. GRB 050306: ROTSE-III early limits
  47. GRB050316: MASTER optical observations
  48. GRB 050315: Swift-BAT further refined analysis
  49. GRB 050315, SMARTS optical/IR afterglow observations
  50. GRB 050315 I-band observations
  51. GRB050315: Radio afterglow
  52. GRB 050315: Absorption redshift
  53. GRB 050315: Optical afterglow identification
  54. GRB050315: Swift-BAT Refined analysis
  55. Non-detection of GRB050315 in ATCA Radio Observations
  56. GRB 050315: Swift XRT Position
  57. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  58. GRB 050315: Early Observations with Swift/UVOT
  59. Swift-BAT detection of GRB 050315
  60. GRB 050306: Radio Observations
  61. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  62. GRB050309: CONCAM pre-trigger and trigger coincident optical
  63. GRB 050306: optical afterglow
  64. GRB 050126: Redshift determination
  65. Swift-BAT trigger 107873: No Swift XRT counterpart
  66. GRB 050306: Confirmation of X-ray afterglow
  67. GRB 050309, Early optical limits from RAPTOR
  68. GRB 050306: further TAROT optical data
  69. GRB050309: Early optical limit from P60
  70. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  71. GRB 050309 : Lulin R-band observation
  72. Swift 107873: P60 Optical Observations
  73. GRB 050306: CORRECTION to date of observation
  74. GRB 050306: R-band observations
  75. GRB 050306: No Swift UVOT Optical Counterpart Detected
  76. GRB 050306: REM optical-infrared observations
  77. GRB 050306: Possible X-ray Afterglow Position from the Swift
  78. Swift trigger 107518: optical observation
  79. GRB 050306: TAROT optical observations
  80. GRB 050306,optical observation
  81. GRB 050306: Swift-BAT detection of a long burst
  82. GRB 050126: Confirmation of the NIR afterglow candidate
  83. PROMPT VRcIc Observations of GRB 050223
  84. XRF/GRB 050215B: Radio Observations
  85. XMM-Newton Images of GRB 050223
  86. GRB 050219b: candidate NIR afterglow
  87. IBAS GRB Alert #2321
  88. GRB 050223: optical observations
  89. INTEGRAL detection of GRB 050223
  90. GRB 050223 : Planned XMM-Newton observation
  91. GRB050223: ROTSE-III Optical Observations
  92. GRB 050223 Swift/BAT detection of a burst
  93. GRB 050223: Swift XRT Position
  94. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  95. GRB 050219b: CORRECTION to refined XRT position
  96. GRB 050219a: Optical observations from LCO
  97. GRB 050219b: Optical and near-IR observations from LCO
  98. GRB 050219b: Refined XRT position
  99. GRB 050219b: Swift-BAT detection of a burst
  100. GRB 050219b: CORRECTION: Swift XRT Position

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