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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"

21831 results found.

  1. GRB 050408: SOAR UBVRc Observations
  2. GRB 050408: Properties of the Host Galaxy
  3. GRB 050408: Mercator Optical Observations
  4. GRB050408: Radio Observations
  5. GRB 050408, SMARTS optical/IR afterglow observations
  6. GRB 050408, optical observations
  7. GRB 050408: Moderate-resolution Gemini Spectroscopy
  8. GRB 050408 Optical Observations
  9. GRB 050408: Mercator Optical Observations
  10. GRB 050408: First Optical observations with TFOSC at the RTT150
  11. GRB 050408, optical observations
  12. GRB 050408 optical candidate
  13. GRB050408: MASTER optical observations
  14. GRB050401: Radio Detection
  15. GRB 050406: Magellan optical observations
  16. GRB 050406: Early observations with Swift-UVOT
  17. GRB050401: Radio observation at 610 MHz with GMRT
  18. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  19. GRB 050401 Optical Observations
  20. GRB050401: TNG R-band observation
  21. GRB 050402A: IR Observations
  22. GRB 050402: Early observations with Swift-UVOT
  23. Swift Trigger 113225: P60 Observations
  24. GRB 050401: Optical afterglow confirmed
  25. GRB 050401: Optical afterglow candidate
  26. GRB050331: No Afterglow Detected
  27. GRB 050331: Swift UVOT Source
  28. GRB050319: radio observation
  29. GRB 050326: Early observations with Swift-UVOT
  30. GRB 050326: Swift XRT Position
  31. GRB050326: delayed XRT observation
  32. GRB050319, optical observations
  33. GRB050319, color indices
  34. GRB050319: optical observation, March 20-22
  35. GRB050319: RTT150 Optical Observations
  36. GRB 050319: ROTSE-III Refined Analysis
  37. GRB050319: VLA Observations
  38. GRB 050319 R band observations
  39. GRB 050319: Swift-UVOT detection of the afterglow
  40. GRB050319: Radio Observations
  41. GRB 050319: NIR afterglow candidate
  42. GRB 050319:Near IR afterglow
  43. GRB 050319 : Confirmation of optical afterglow decay
  44. GRB 050319: Detection of Possible Optical Counterpart
  45. GRB 050318: Swift/UVOT detection of afterglow emission
  46. RXTE Observations of GRB050318
  47. GRB 050315, SMARTS optical afterglow decay
  48. GRB050316: MASTER before, simultanious and follow up optical
  49. GRB050316: MASTER optical observations
  50. GRB 050315, SMARTS optical/IR afterglow observations
  51. GRB 050315 I-band observations
  52. GRB050315: Radio afterglow
  53. Non-detection of GRB050315 in ATCA Radio Observations
  54. GRB 050315: Swift XRT Position
  55. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  56. GRB 050315: Early Observations with Swift/UVOT
  57. Swift-BAT detection of GRB 050315
  58. GRB050223: No XMM-Newton OM detection of afterglow emission
  59. GRB 050306: Radio Observations
  60. GRB 050306: optical afterglow
  61. GRB 050126: Redshift determination
  62. Swift-BAT trigger 107873: No Swift XRT counterpart
  63. GRB050309: Early optical limit from P60
  64. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  65. Swift 107873: P60 Optical Observations
  66. GRB 050306: CORRECTION to date of observation
  67. GRB 050306: R-band observations
  68. GRB 050306: No Swift UVOT Optical Counterpart Detected
  69. GRB 050306: REM optical-infrared observations
  70. GRB 050306: Possible X-ray Afterglow Position from the Swift
  71. GRB 050306: TAROT optical observations
  72. GRB050215B: Late-Time Swift UVOT Observations
  73. GRB 050126: Confirmation of the NIR afterglow candidate
  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: No Swift UVOT Detection of Afterglow Emission
  79. GRB050223: ROTSE-III Optical Observations
  80. GRB 050223: Swift XRT Position
  81. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  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 050219a: Optical observations from LCO
  86. GRB 050219b: Optical and near-IR observations from LCO
  87. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  88. GRB 050219b: CORRECTION: Swift XRT Position
  89. GRB 050219b: Swift XRT Position
  90. GRB 050219a, optical observations
  91. GRB 050219a: Refined XRT position
  92. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  93. GRB050215b: Swift UVOT Detection of Afterglow Emission
  94. GRB 050215B: Radio Observations
  95. GRB 050215b: XRT confirmation of IR afterglow candidate
  96. GRB050215b: P60 Optical Observations
  97. GRB 050215b: Swift XRT Source Variability
  98. GRB 050215b : Lulin follow-up observation
  99. GRB 050215b, BOOTES-2 simultaneous optical observations
  100. GRB 050215b: Swift XRT Observations

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