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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"

38578 results found.

  1. GRB 050402: Early observations with Swift-UVOT
  2. Swift Trigger 113225: P60 Observations
  3. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  4. GRB 050401: Optical afterglow confirmed
  5. GRB 050401: Optical afterglow candidate
  6. Swift-BAT detection of GRB 050401
  7. GRB 050401: Prompt XRT position
  8. Retraction of three Swift GRB triggers
  9. GRB050331: No Afterglow Detected
  10. Swift-BAT detection of GRB 050331b
  11. GRB 050331: Swift UVOT Source
  12. Swift-BAT detection of GRB 050331
  13. GRB 050331: Swift XRT Position
  14. Swift Data Publicly Available Starting April 5, 2005
  15. GRB050319: radio observation
  16. Konus-Wind observation of GRB 050326
  17. GRB 050326: Early observations with Swift-UVOT
  18. GRB 050326 XMM-Newton observation
  19. GRB 050326 : Planned XMM-Newton observation
  20. GRB 050326: Swift XRT Position
  21. GRB050326: optical limit 33min before GRB
  22. GRB 050326 BAT refined analysis
  23. GRB050326: delayed XRT observation
  24. Swift-BAT detection of a bright GRB 050326
  25. GRB050319, optical observations
  26. GRB050319: optical observation, March 20-22
  27. GRB050319: RTT150 Optical Observations
  28. Swift-BAT detection of a bright outburst from SGR1806-20
  29. Swift-BAT trigger 112060 is not a real GRB
  30. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  31. GRB 050319: ROTSE-III Refined Analysis
  32. GRB 050318: Swift-BAT refined analysis
  33. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  34. GRB050319: VLA Observations
  35. GRB050319: radio observation
  36. GRB 050319 R band observations
  37. GRB 050319: Swift-UVOT detection of the afterglow
  38. GRB 050315: Variability Analysis of Swift BAT Time History
  39. GRB050319: Radio Observations
  40. GRB 050319: NIR afterglow candidate
  41. GRB 050319:Near IR afterglow
  42. GRB050319: BR optical photometry
  43. GRB 050318: SWIFT-UVOT refined analysis
  44. GRB 050318: Absorption redshift from Magellan
  45. GRB 050319 : Confirmation of optical afterglow decay
  46. GRB 050319: Swift-BAT refined analysis
  47. GRB050319,optical observation
  48. Swift Detection of GRB 050319
  49. GRB 050319: Detection of Possible Optical Counterpart
  50. GRB 050318: Swift/UVOT detection of afterglow emission
  51. GRB 050318: Magellan optical afterglow identification
  52. GRB050318: Swift XRT position
  53. Swift-BAT detection of GRB 050318
  54. GRB 050315, SMARTS optical afterglow decay
  55. GRB050223: analysis of the XMM-Newton observation
  56. GRB050316: MASTER before, simultanious and follow up optical
  57. GRB 050306: ROTSE-III early limits
  58. GRB050316: MASTER optical observations
  59. GRB 050315: Swift-BAT further refined analysis
  60. GRB 050315, SMARTS optical/IR afterglow observations
  61. GRB 050315 I-band observations
  62. GRB050315: Radio afterglow
  63. GRB 050315: Absorption redshift
  64. GRB 050315: Optical afterglow identification
  65. GRB050315: Swift-BAT Refined analysis
  66. Non-detection of GRB050315 in ATCA Radio Observations
  67. GRB 050315: Swift XRT Position
  68. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  69. GRB 050315: Early Observations with Swift/UVOT
  70. Swift-BAT detection of GRB 050315
  71. GRB050223: No XMM-Newton OM detection of afterglow emission
  72. GRB 050306: Radio Observations
  73. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  74. GRB050309: CONCAM pre-trigger and trigger coincident optical
  75. GRB 050306: optical afterglow
  76. GRB 050126: Redshift determination
  77. Swift-BAT trigger 107873: No Swift XRT counterpart
  78. GRB 050306: Confirmation of X-ray afterglow
  79. GRB 050309, Early optical limits from RAPTOR
  80. GRB050309: Early optical limit from P60
  81. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  82. GRB 050309 : Lulin R-band observation
  83. Swift 107873: P60 Optical Observations
  84. GRB 050306: CORRECTION to date of observation
  85. GRB 050306: R-band observations
  86. GRB 050306: No Swift UVOT Optical Counterpart Detected
  87. GRB 050306: REM optical-infrared observations
  88. GRB 050306: Possible X-ray Afterglow Position from the Swift
  89. GRB 050306,optical observation
  90. GRB 050306: Swift-BAT detection of a long burst
  91. Ongoing activity of SGR 1806-20 after the giant flare
  92. GRB050215B: Late-Time Swift UVOT Observations
  93. GRB 050126: Confirmation of the NIR afterglow candidate
  94. PROMPT VRcIc Observations of GRB 050223
  95. XRF/GRB 050215B: Radio Observations
  96. GRB 050219b: candidate NIR afterglow
  97. IBAS GRB Alert #2321
  98. Confirmed XRF nature for GRB050215b
  99. GRB 050223: optical observations
  100. GRB050223 XMM-Newton observation

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