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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"

36216 results found.

  1. GRB 050331: Swift XRT Position
  2. GRB050319: radio observation
  3. Konus-Wind observation of GRB 050326
  4. GRB 050326: Early observations with Swift-UVOT
  5. GRB 050326 XMM-Newton observation
  6. GRB 050326 : Planned XMM-Newton observation
  7. GRB 050326: Swift XRT Position
  8. GRB050326: optical limit 33min before GRB
  9. GRB 050326 BAT refined analysis
  10. GRB050326: delayed XRT observation
  11. Swift-BAT detection of a bright GRB 050326
  12. GRB050319, color indices
  13. GRB050319: RTT150 Optical Observations
  14. Swift-BAT trigger 112060 is not a real GRB
  15. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  16. GRB 050319: ROTSE-III Refined Analysis
  17. GRB 050318: Swift-BAT refined analysis
  18. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  19. GRB050319: VLA Observations
  20. GRB 050319 R band observations
  21. GRB 050319: Swift-UVOT detection of the afterglow
  22. GRB 050315: Variability Analysis of Swift BAT Time History
  23. GRB050319: Radio Observations
  24. GRB 050319: NIR afterglow candidate
  25. GRB 050319:Near IR afterglow
  26. GRB 050318: SWIFT-UVOT refined analysis
  27. GRB 050318: Absorption redshift from Magellan
  28. GRB 050319: Optical observation
  29. GRB 050319 : Confirmation of optical afterglow decay
  30. GRB 050319: Swift-BAT refined analysis
  31. GRB050319,optical observation
  32. Swift Detection of GRB 050319
  33. GRB 050319: Detection of Possible Optical Counterpart
  34. GRB 050318: Swift/UVOT detection of afterglow emission
  35. GRB 050318: Magellan optical afterglow identification
  36. GRB050318: Swift XRT position
  37. RXTE Observations of GRB050318
  38. Swift-BAT detection of GRB 050318
  39. GRB 050315, SMARTS optical afterglow decay
  40. GRB050316: MASTER before, simultanious and follow up optical
  41. GRB 050306: ROTSE-III early limits
  42. GRB050316: MASTER optical observations
  43. GRB 050315: Swift-BAT further refined analysis
  44. GRB 050315, SMARTS optical/IR afterglow observations
  45. GRB 050315 I-band observations
  46. GRB050315: Radio afterglow
  47. GRB 050315: Absorption redshift
  48. GRB 050315: Optical afterglow identification
  49. GRB050315: Swift-BAT Refined analysis
  50. Non-detection of GRB050315 in ATCA Radio Observations
  51. GRB 050315: Swift XRT Position
  52. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  53. GRB 050315: Early Observations with Swift/UVOT
  54. Swift-BAT detection of GRB 050315
  55. GRB 050306: Radio Observations
  56. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  57. GRB050309: CONCAM pre-trigger and trigger coincident optical
  58. GRB 050306: optical afterglow
  59. GRB 050126: Redshift determination
  60. Swift-BAT trigger 107873: No Swift XRT counterpart
  61. GRB 050306: Confirmation of X-ray afterglow
  62. GRB 050309, Early optical limits from RAPTOR
  63. GRB 050306: further TAROT optical data
  64. GRB050309: Early optical limit from P60
  65. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  66. GRB 050309 : Lulin R-band observation
  67. Swift 107873: P60 Optical Observations
  68. GRB 050306: CORRECTION to date of observation
  69. GRB 050306: R-band observations
  70. GRB 050306: No Swift UVOT Optical Counterpart Detected
  71. GRB 050306: REM optical-infrared observations
  72. GRB 050306: Possible X-ray Afterglow Position from the Swift
  73. Swift trigger 107518: optical observation
  74. GRB 050306: TAROT optical observations
  75. GRB 050306,optical observation
  76. GRB 050306: Swift-BAT detection of a long burst
  77. GRB 050126: Confirmation of the NIR afterglow candidate
  78. PROMPT VRcIc Observations of GRB 050223
  79. XRF/GRB 050215B: Radio Observations
  80. XMM-Newton Images of GRB 050223
  81. GRB 050219b: candidate NIR afterglow
  82. IBAS GRB Alert #2321
  83. GRB 050223: optical observations
  84. INTEGRAL detection of GRB 050223
  85. GRB 050223 : Planned XMM-Newton observation
  86. GRB050223: ROTSE-III Optical Observations
  87. GRB 050223 Swift/BAT detection of a burst
  88. GRB 050223: Swift XRT Position
  89. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  90. GRB 050219b: CORRECTION to refined XRT position
  91. GRB 050219a: Optical observations from LCO
  92. GRB 050219b: Optical and near-IR observations from LCO
  93. GRB 050219b: Refined XRT position
  94. GRB 050219b: Swift-BAT detection of a burst
  95. GRB 050219b: CORRECTION: Swift XRT Position
  96. GRB 050219b: Swift XRT Position
  97. GRB 050219a, optical observations
  98. GRB 050219a: Refined XRT position
  99. GRB 050219: Swift-BAT detection of a burst
  100. GRB050215b: Swift UVOT Detection of Afterglow Emission

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