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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"

36211 results found.

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

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