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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"

32722 results found.

  1. GRB050319: optical observation, March 20-22
  2. GRB050319: RTT150 Optical Observations
  3. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  4. GRB 050319: ROTSE-III Refined Analysis
  5. GRB 050318: Swift-BAT refined analysis
  6. GRB050319: VLA Observations
  7. GRB050319: radio observation
  8. GRB 050319 R band observations
  9. GRB 050319: Swift-UVOT detection of the afterglow
  10. GRB 050315: Variability Analysis of Swift BAT Time History
  11. GRB050319: Radio Observations
  12. GRB 050319: NIR afterglow candidate
  13. GRB 050319:Near IR afterglow
  14. GRB050319: BR optical photometry
  15. GRB 050318: SWIFT-UVOT refined analysis
  16. GRB 050318: Absorption redshift from Magellan
  17. GRB 050319: Optical observation
  18. GRB 050319: Swift-BAT refined analysis
  19. GRB050319,optical observation
  20. GRB 050318: Swift/UVOT detection of afterglow emission
  21. GRB 050318: Magellan optical afterglow identification
  22. GRB050318: Swift XRT position
  23. RXTE Observations of GRB050318
  24. GRB 050315, SMARTS optical afterglow decay
  25. GRB050223: analysis of the XMM-Newton observation
  26. GRB050316: MASTER before, simultanious and follow up optical
  27. GRB 050306: ROTSE-III early limits
  28. GRB 050315: Swift-BAT further refined analysis
  29. GRB 050315, SMARTS optical/IR afterglow observations
  30. GRB 050315 I-band observations
  31. GRB050315: Radio afterglow
  32. GRB 050315: Absorption redshift
  33. GRB 050315: Optical afterglow identification
  34. GRB050315: Swift-BAT Refined analysis
  35. Non-detection of GRB050315 in ATCA Radio Observations
  36. GRB 050315: Swift XRT Position
  37. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  38. GRB 050315: Early Observations with Swift/UVOT
  39. GRB050223: No XMM-Newton OM detection of afterglow emission
  40. GRB 050306: Radio Observations
  41. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  42. GRB 050306: optical afterglow
  43. Swift-BAT trigger 107873: No Swift XRT counterpart
  44. GRB 050306: Confirmation of X-ray afterglow
  45. GRB 050309, Early optical limits from RAPTOR
  46. GRB050309: Early optical limit from P60
  47. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  48. GRB 050306: CORRECTION to date of observation
  49. GRB 050306: R-band observations
  50. GRB 050306: No Swift UVOT Optical Counterpart Detected
  51. GRB 050306: REM optical-infrared observations
  52. GRB 050306: Possible X-ray Afterglow Position from the Swift
  53. GRB 050306,optical observation
  54. GRB050215B: Late-Time Swift UVOT Observations
  55. PROMPT VRcIc Observations of GRB 050223
  56. XRF/GRB 050215B: Radio Observations
  57. GRB 050219b: candidate NIR afterglow
  58. GRB 050223: optical observations
  59. GRB050223 XMM-Newton observation
  60. INTEGRAL detection of GRB 050223
  61. GRB050223: No Swift UVOT Detection of Afterglow Emission
  62. GRB050223: ROTSE-III Optical Observations
  63. GRB050219b: CORRECTION to time of UVOT observations
  64. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  65. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  66. GRB 050219b: CORRECTION to refined XRT position
  67. GRB 050219a: Optical observations from LCO
  68. GRB 050219b: Optical and near-IR observations from LCO
  69. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  70. GRB 050219b: CORRECTION: Swift XRT Position
  71. GRB 050219a, optical observations
  72. GRB 050219a: Refined XRT position
  73. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  74. GRB 050219: Swift-BAT detection of a burst
  75. GRB050215b: Swift UVOT Detection of Afterglow Emission
  76. GRB 050215B: Radio Observations
  77. GRB 050215b: XRT confirmation of IR afterglow candidate
  78. GRB050215b: P60 Optical Observations
  79. GRB 050215b: Swift XRT Source Variability
  80. GRB 050215B: candidate afterglow
  81. GRB 050215b : Lulin follow-up observation
  82. GRB 050215b, BOOTES-2 simultaneous optical observations
  83. GRB 050215B: UKIRT K-band imaging
  84. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  85. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  86. GRB 050215b, BOOTES-1B optical limit
  87. GRB050215A: ROTSE-III Optical Observations
  88. GRB050209: TAROT optical observations
  89. short/hard GRB 050202, optical observations
  90. GRB050209: REM optical observations
  91. GRB 050209 I-band observation
  92. GRB050209: P60 Optical Observations
  93. GRB050209 (=U11568): A Long GRB Detected by HETE
  94. GRB 050128: Radio observations
  95. Further analysis of the short Swift-BAT GRB 050202
  96. GRB 050202: Second epoch radio observations
  97. GRB 050129: Optical observations
  98. GRB050202: Radio Observations
  99. GRB 050202: Optical observations with LCO40
  100. GRB 050128 Optical observation with REM

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