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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

30654 results found.

  1. Konus-Wind observation of GRB 050401
  2. GRB050401: Radio observation at 610 MHz with GMRT
  3. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  4. GRB 050401: VLT spectroscopic redshift
  5. GRB 050401 Optical Observations
  6. GRB050401: Maidanak optical observation
  7. GRB 050401 BAT refined analysis
  8. GRB050401: TNG R-band observation
  9. GRB 050402A: IR Analysis
  10. GRB050402: XDSS counterpart
  11. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  12. GRB 050401: Optical afterglow confirmed
  13. Swift-BAT detection of GRB 050401
  14. Retraction of three Swift GRB triggers
  15. GRB050331: No Afterglow Detected
  16. Swift-BAT detection of GRB 050331b
  17. GRB 050331: Swift UVOT Source
  18. Swift-BAT detection of GRB 050331
  19. Swift Data Publicly Available Starting April 5, 2005
  20. GRB050319: radio observation
  21. Konus-Wind observation of GRB 050326
  22. GRB050326: optical limit
  23. GRB 050326: Early observations with Swift-UVOT
  24. GRB 050326 XMM-Newton observation
  25. GRB 050326 : Planned XMM-Newton observation
  26. GRB 050326: Swift XRT Position
  27. GRB050326: optical limit 33min before GRB
  28. GRB 050326 BAT refined analysis
  29. GRB050326: delayed XRT observation
  30. Swift-BAT detection of a bright GRB 050326
  31. GRB050319, optical observations
  32. GRB050319, color indices
  33. GRB050319: optical observation, March 20-22
  34. GRB050319: RTT150 Optical Observations
  35. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  36. GRB 050319: ROTSE-III Refined Analysis
  37. GRB 050318: Swift-BAT refined analysis
  38. GRB050319: VLA Observations
  39. GRB050319: radio observation
  40. GRB 050319 R band observations
  41. GRB 050319: Swift-UVOT detection of the afterglow
  42. GRB 050315: Variability Analysis of Swift BAT Time History
  43. GRB050319: Radio Observations
  44. GRB 050319: NIR afterglow candidate
  45. GRB 050319:Near IR afterglow
  46. GRB050319: BR optical photometry
  47. GRB 050318: SWIFT-UVOT refined analysis
  48. GRB 050318: Absorption redshift from Magellan
  49. GRB 050319: Optical observation
  50. GRB 050319: Swift-BAT refined analysis
  51. GRB050319,optical observation
  52. GRB 050318: Swift/UVOT detection of afterglow emission
  53. GRB 050318: Magellan optical afterglow identification
  54. GRB050318: Swift XRT position
  55. RXTE Observations of GRB050318
  56. GRB 050315, SMARTS optical afterglow decay
  57. GRB050223: analysis of the XMM-Newton observation
  58. GRB050316: MASTER before, simultanious and follow up optical
  59. GRB 050306: ROTSE-III early limits
  60. GRB 050315: Swift-BAT further refined analysis
  61. GRB 050315, SMARTS optical/IR afterglow observations
  62. GRB 050315 I-band observations
  63. GRB050315: Radio afterglow
  64. GRB 050315: Absorption redshift
  65. GRB 050315: Optical afterglow identification
  66. GRB050315: Swift-BAT Refined analysis
  67. Non-detection of GRB050315 in ATCA Radio Observations
  68. GRB 050315: Swift XRT Position
  69. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  70. GRB 050315: Early Observations with Swift/UVOT
  71. GRB050223: No XMM-Newton OM detection of afterglow emission
  72. GRB 050306: Radio Observations
  73. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  74. GRB 050306: optical afterglow
  75. Swift-BAT trigger 107873: No Swift XRT counterpart
  76. GRB 050306: Confirmation of X-ray afterglow
  77. GRB 050309, Early optical limits from RAPTOR
  78. GRB050309: Early optical limit from P60
  79. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  80. GRB 050306: CORRECTION to date of observation
  81. GRB 050306: R-band observations
  82. GRB 050306: No Swift UVOT Optical Counterpart Detected
  83. GRB 050306: REM optical-infrared observations
  84. GRB 050306: Possible X-ray Afterglow Position from the Swift
  85. GRB 050306,optical observation
  86. GRB050215B: Late-Time Swift UVOT Observations
  87. PROMPT VRcIc Observations of GRB 050223
  88. XRF/GRB 050215B: Radio Observations
  89. GRB 050219b: candidate NIR afterglow
  90. GRB 050223: optical observations
  91. GRB050223 XMM-Newton observation
  92. INTEGRAL detection of GRB 050223
  93. GRB050223: No Swift UVOT Detection of Afterglow Emission
  94. GRB050223: ROTSE-III Optical Observations
  95. GRB050219b: CORRECTION to time of UVOT observations
  96. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  97. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  98. GRB 050219b: CORRECTION to refined XRT position
  99. GRB 050219a: Optical observations from LCO
  100. GRB 050219b: Optical and near-IR observations from LCO

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