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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"

32541 results found.

  1. Retraction of three Swift GRB triggers
  2. GRB050331: No Afterglow Detected
  3. Swift-BAT detection of GRB 050331b
  4. GRB 050331: Swift UVOT Source
  5. Swift-BAT detection of GRB 050331
  6. Swift Data Publicly Available Starting April 5, 2005
  7. GRB050319: radio observation
  8. Konus-Wind observation of GRB 050326
  9. GRB050326: optical limit
  10. GRB 050326: Early observations with Swift-UVOT
  11. GRB 050326 XMM-Newton observation
  12. GRB 050326 : Planned XMM-Newton observation
  13. GRB 050326: Swift XRT Position
  14. GRB050326: optical limit 33min before GRB
  15. GRB 050326 BAT refined analysis
  16. GRB050326: delayed XRT observation
  17. Swift-BAT detection of a bright GRB 050326
  18. GRB050319, optical observations
  19. GRB050319, color indices
  20. GRB050319: optical observation, March 20-22
  21. GRB050319: RTT150 Optical Observations
  22. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  23. GRB 050319: ROTSE-III Refined Analysis
  24. GRB 050318: Swift-BAT refined analysis
  25. GRB050319: VLA Observations
  26. GRB050319: radio observation
  27. GRB 050319 R band observations
  28. GRB 050319: Swift-UVOT detection of the afterglow
  29. GRB 050315: Variability Analysis of Swift BAT Time History
  30. GRB050319: Radio Observations
  31. GRB 050319: NIR afterglow candidate
  32. GRB 050319:Near IR afterglow
  33. GRB050319: BR optical photometry
  34. GRB 050318: SWIFT-UVOT refined analysis
  35. GRB 050318: Absorption redshift from Magellan
  36. GRB 050319: Optical observation
  37. GRB 050319: Swift-BAT refined analysis
  38. GRB050319,optical observation
  39. GRB 050318: Swift/UVOT detection of afterglow emission
  40. GRB 050318: Magellan optical afterglow identification
  41. GRB050318: Swift XRT position
  42. RXTE Observations of GRB050318
  43. GRB 050315, SMARTS optical afterglow decay
  44. GRB050223: analysis of the XMM-Newton observation
  45. GRB050316: MASTER before, simultanious and follow up optical
  46. GRB 050306: ROTSE-III early limits
  47. GRB 050315: Swift-BAT further refined analysis
  48. GRB 050315, SMARTS optical/IR afterglow observations
  49. GRB 050315 I-band observations
  50. GRB050315: Radio afterglow
  51. GRB 050315: Absorption redshift
  52. GRB 050315: Optical afterglow identification
  53. GRB050315: Swift-BAT Refined analysis
  54. Non-detection of GRB050315 in ATCA Radio Observations
  55. GRB 050315: Swift XRT Position
  56. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  57. GRB 050315: Early Observations with Swift/UVOT
  58. GRB050223: No XMM-Newton OM detection of afterglow emission
  59. GRB 050306: Radio Observations
  60. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  61. GRB 050306: optical afterglow
  62. Swift-BAT trigger 107873: No Swift XRT counterpart
  63. GRB 050306: Confirmation of X-ray afterglow
  64. GRB 050309, Early optical limits from RAPTOR
  65. GRB050309: Early optical limit from P60
  66. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  67. GRB 050306: CORRECTION to date of observation
  68. GRB 050306: R-band observations
  69. GRB 050306: No Swift UVOT Optical Counterpart Detected
  70. GRB 050306: REM optical-infrared observations
  71. GRB 050306: Possible X-ray Afterglow Position from the Swift
  72. GRB 050306,optical observation
  73. GRB050215B: Late-Time Swift UVOT Observations
  74. PROMPT VRcIc Observations of GRB 050223
  75. XRF/GRB 050215B: Radio Observations
  76. GRB 050219b: candidate NIR afterglow
  77. GRB 050223: optical observations
  78. GRB050223 XMM-Newton observation
  79. INTEGRAL detection of GRB 050223
  80. GRB050223: No Swift UVOT Detection of Afterglow Emission
  81. GRB050223: ROTSE-III Optical Observations
  82. GRB050219b: CORRECTION to time of UVOT observations
  83. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  84. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  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. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  89. GRB 050219b: CORRECTION: Swift XRT Position
  90. GRB 050219a, optical observations
  91. GRB 050219a: Refined XRT position
  92. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  93. GRB 050219: Swift-BAT detection of a burst
  94. GRB050215b: Swift UVOT Detection of Afterglow Emission
  95. GRB 050215B: Radio Observations
  96. GRB 050215b: XRT confirmation of IR afterglow candidate
  97. GRB050215b: P60 Optical Observations
  98. GRB 050215b: Swift XRT Source Variability
  99. GRB 050215B: candidate afterglow
  100. GRB 050215b : Lulin follow-up observation

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