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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"

32720 results found.

  1. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  2. GRB 050319: ROTSE-III Refined Analysis
  3. GRB 050318: Swift-BAT refined analysis
  4. GRB050319: VLA Observations
  5. GRB050319: radio observation
  6. GRB 050319 R band observations
  7. GRB 050319: Swift-UVOT detection of the afterglow
  8. GRB 050315: Variability Analysis of Swift BAT Time History
  9. GRB050319: Radio Observations
  10. GRB 050319: NIR afterglow candidate
  11. GRB 050319:Near IR afterglow
  12. GRB050319: BR optical photometry
  13. GRB 050318: SWIFT-UVOT refined analysis
  14. GRB 050318: Absorption redshift from Magellan
  15. GRB 050319: Optical observation
  16. GRB 050319: Swift-BAT refined analysis
  17. GRB050319,optical observation
  18. GRB 050318: Swift/UVOT detection of afterglow emission
  19. GRB 050318: Magellan optical afterglow identification
  20. GRB050318: Swift XRT position
  21. RXTE Observations of GRB050318
  22. GRB 050315, SMARTS optical afterglow decay
  23. GRB050223: analysis of the XMM-Newton observation
  24. GRB050316: MASTER before, simultanious and follow up optical
  25. GRB 050306: ROTSE-III early limits
  26. GRB 050315: Swift-BAT further refined analysis
  27. GRB 050315, SMARTS optical/IR afterglow observations
  28. GRB 050315 I-band observations
  29. GRB050315: Radio afterglow
  30. GRB 050315: Absorption redshift
  31. GRB 050315: Optical afterglow identification
  32. GRB050315: Swift-BAT Refined analysis
  33. Non-detection of GRB050315 in ATCA Radio Observations
  34. GRB 050315: Swift XRT Position
  35. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  36. GRB 050315: Early Observations with Swift/UVOT
  37. GRB050223: No XMM-Newton OM detection of afterglow emission
  38. GRB 050306: Radio Observations
  39. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  40. GRB 050306: optical afterglow
  41. Swift-BAT trigger 107873: No Swift XRT counterpart
  42. GRB 050306: Confirmation of X-ray afterglow
  43. GRB 050309, Early optical limits from RAPTOR
  44. GRB050309: Early optical limit from P60
  45. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  46. GRB 050306: CORRECTION to date of observation
  47. GRB 050306: R-band observations
  48. GRB 050306: No Swift UVOT Optical Counterpart Detected
  49. GRB 050306: REM optical-infrared observations
  50. GRB 050306: Possible X-ray Afterglow Position from the Swift
  51. GRB 050306,optical observation
  52. GRB050215B: Late-Time Swift UVOT Observations
  53. PROMPT VRcIc Observations of GRB 050223
  54. XRF/GRB 050215B: Radio Observations
  55. GRB 050219b: candidate NIR afterglow
  56. GRB 050223: optical observations
  57. GRB050223 XMM-Newton observation
  58. INTEGRAL detection of GRB 050223
  59. GRB050223: No Swift UVOT Detection of Afterglow Emission
  60. GRB050223: ROTSE-III Optical Observations
  61. GRB050219b: CORRECTION to time of UVOT observations
  62. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  63. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  64. GRB 050219b: CORRECTION to refined XRT position
  65. GRB 050219a: Optical observations from LCO
  66. GRB 050219b: Optical and near-IR observations from LCO
  67. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  68. GRB 050219b: CORRECTION: Swift XRT Position
  69. GRB 050219a, optical observations
  70. GRB 050219a: Refined XRT position
  71. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  72. GRB 050219: Swift-BAT detection of a burst
  73. GRB050215b: Swift UVOT Detection of Afterglow Emission
  74. GRB 050215B: Radio Observations
  75. GRB 050215b: XRT confirmation of IR afterglow candidate
  76. GRB050215b: P60 Optical Observations
  77. GRB 050215b: Swift XRT Source Variability
  78. GRB 050215B: candidate afterglow
  79. GRB 050215b : Lulin follow-up observation
  80. GRB 050215b, BOOTES-2 simultaneous optical observations
  81. GRB 050215B: UKIRT K-band imaging
  82. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  83. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  84. GRB 050215b, BOOTES-1B optical limit
  85. GRB050215A: ROTSE-III Optical Observations
  86. GRB050209: TAROT optical observations
  87. short/hard GRB 050202, optical observations
  88. GRB050209: REM optical observations
  89. GRB 050209 I-band observation
  90. GRB050209: P60 Optical Observations
  91. GRB050209 (=U11568): A Long GRB Detected by HETE
  92. GRB 050128: Radio observations
  93. Further analysis of the short Swift-BAT GRB 050202
  94. GRB 050202: Second epoch radio observations
  95. GRB 050129: Optical observations
  96. GRB050202: Radio Observations
  97. GRB 050202: Optical observations with LCO40
  98. GRB 050128 Optical observation with REM
  99. GRB050128: Faulkes Telescope South observations
  100. GRB 050124: Radio Observations

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