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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"

32725 results found.

  1. Swift-BAT detection of a bright GRB 050326
  2. GRB050319, optical observations
  3. GRB050319, color indices
  4. GRB050319: optical observation, March 20-22
  5. GRB050319: RTT150 Optical Observations
  6. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  7. GRB 050319: ROTSE-III Refined Analysis
  8. GRB 050318: Swift-BAT refined analysis
  9. GRB050319: VLA Observations
  10. GRB050319: radio observation
  11. GRB 050319 R band observations
  12. GRB 050319: Swift-UVOT detection of the afterglow
  13. GRB 050315: Variability Analysis of Swift BAT Time History
  14. GRB050319: Radio Observations
  15. GRB 050319: NIR afterglow candidate
  16. GRB 050319:Near IR afterglow
  17. GRB050319: BR optical photometry
  18. GRB 050318: SWIFT-UVOT refined analysis
  19. GRB 050318: Absorption redshift from Magellan
  20. GRB 050319: Optical observation
  21. GRB 050319: Swift-BAT refined analysis
  22. GRB050319,optical observation
  23. GRB 050318: Swift/UVOT detection of afterglow emission
  24. GRB 050318: Magellan optical afterglow identification
  25. GRB050318: Swift XRT position
  26. RXTE Observations of GRB050318
  27. GRB 050315, SMARTS optical afterglow decay
  28. GRB050223: analysis of the XMM-Newton observation
  29. GRB050316: MASTER before, simultanious and follow up optical
  30. GRB 050306: ROTSE-III early limits
  31. GRB 050315: Swift-BAT further refined analysis
  32. GRB 050315, SMARTS optical/IR afterglow observations
  33. GRB 050315 I-band observations
  34. GRB050315: Radio afterglow
  35. GRB 050315: Absorption redshift
  36. GRB 050315: Optical afterglow identification
  37. GRB050315: Swift-BAT Refined analysis
  38. Non-detection of GRB050315 in ATCA Radio Observations
  39. GRB 050315: Swift XRT Position
  40. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  41. GRB 050315: Early Observations with Swift/UVOT
  42. GRB050223: No XMM-Newton OM detection of afterglow emission
  43. GRB 050306: Radio Observations
  44. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  45. GRB 050306: optical afterglow
  46. Swift-BAT trigger 107873: No Swift XRT counterpart
  47. GRB 050306: Confirmation of X-ray afterglow
  48. GRB 050309, Early optical limits from RAPTOR
  49. GRB050309: Early optical limit from P60
  50. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  51. GRB 050306: CORRECTION to date of observation
  52. GRB 050306: R-band observations
  53. GRB 050306: No Swift UVOT Optical Counterpart Detected
  54. GRB 050306: REM optical-infrared observations
  55. GRB 050306: Possible X-ray Afterglow Position from the Swift
  56. GRB 050306,optical observation
  57. GRB050215B: Late-Time Swift UVOT Observations
  58. PROMPT VRcIc Observations of GRB 050223
  59. XRF/GRB 050215B: Radio Observations
  60. GRB 050219b: candidate NIR afterglow
  61. GRB 050223: optical observations
  62. GRB050223 XMM-Newton observation
  63. INTEGRAL detection of GRB 050223
  64. GRB050223: No Swift UVOT Detection of Afterglow Emission
  65. GRB050223: ROTSE-III Optical Observations
  66. GRB050219b: CORRECTION to time of UVOT observations
  67. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  68. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  69. GRB 050219b: CORRECTION to refined XRT position
  70. GRB 050219a: Optical observations from LCO
  71. GRB 050219b: Optical and near-IR observations from LCO
  72. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  73. GRB 050219b: CORRECTION: Swift XRT Position
  74. GRB 050219a, optical observations
  75. GRB 050219a: Refined XRT position
  76. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  77. GRB 050219: Swift-BAT detection of a burst
  78. GRB050215b: Swift UVOT Detection of Afterglow Emission
  79. GRB 050215B: Radio Observations
  80. GRB 050215b: XRT confirmation of IR afterglow candidate
  81. GRB050215b: P60 Optical Observations
  82. GRB 050215b: Swift XRT Source Variability
  83. GRB 050215B: candidate afterglow
  84. GRB 050215b : Lulin follow-up observation
  85. GRB 050215b, BOOTES-2 simultaneous optical observations
  86. GRB 050215B: UKIRT K-band imaging
  87. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  88. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  89. GRB 050215b, BOOTES-1B optical limit
  90. GRB050215A: ROTSE-III Optical Observations
  91. GRB050209: TAROT optical observations
  92. short/hard GRB 050202, optical observations
  93. GRB050209: REM optical observations
  94. GRB 050209 I-band observation
  95. GRB050209: P60 Optical Observations
  96. GRB050209 (=U11568): A Long GRB Detected by HETE
  97. GRB 050128: Radio observations
  98. Further analysis of the short Swift-BAT GRB 050202
  99. GRB 050202: Second epoch radio observations
  100. GRB 050129: Optical observations

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