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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"

26038 results found.

  1. GRB 050318: Swift/UVOT detection of afterglow emission
  2. GRB 050318: Magellan optical afterglow identification
  3. GRB050318: Swift XRT position
  4. Swift-BAT detection of GRB 050318
  5. GRB 050315, SMARTS optical afterglow decay
  6. GRB050223: analysis of the XMM-Newton observation
  7. GRB 050306: ROTSE-III early limits
  8. GRB 050315: Swift-BAT further refined analysis
  9. GRB 050315, SMARTS optical/IR afterglow observations
  10. GRB 050315 I-band observations
  11. GRB050315: Radio afterglow
  12. GRB 050315: Absorption redshift
  13. GRB 050315: Optical afterglow identification
  14. GRB050315: Swift-BAT Refined analysis
  15. Non-detection of GRB050315 in ATCA Radio Observations
  16. GRB 050315: Swift XRT Position
  17. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  18. GRB 050315: Early Observations with Swift/UVOT
  19. Swift-BAT detection of GRB 050315
  20. GRB050223: No XMM-Newton OM detection of afterglow emission
  21. GRB 050306: Radio Observations
  22. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  23. GRB050309: CONCAM pre-trigger and trigger coincident optical
  24. GRB 050306: optical afterglow
  25. GRB 050126: Redshift determination
  26. Swift-BAT trigger 107873: No Swift XRT counterpart
  27. GRB 050306: Confirmation of X-ray afterglow
  28. GRB 050309, Early optical limits from RAPTOR
  29. GRB050309: Early optical limit from P60
  30. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  31. GRB 050309 : Lulin R-band observation
  32. Swift 107873: P60 Optical Observations
  33. GRB 050306: CORRECTION to date of observation
  34. GRB 050306: R-band observations
  35. GRB 050306: No Swift UVOT Optical Counterpart Detected
  36. GRB 050306: REM optical-infrared observations
  37. GRB 050306: Possible X-ray Afterglow Position from the Swift
  38. Swift trigger 107518: optical observation
  39. GRB 050306,optical observation
  40. GRB 050306: Swift-BAT detection of a long burst
  41. GRB050215B: Late-Time Swift UVOT Observations
  42. GRB 050126: Confirmation of the NIR afterglow candidate
  43. PROMPT VRcIc Observations of GRB 050223
  44. XRF/GRB 050215B: Radio Observations
  45. GRB 050219b: candidate NIR afterglow
  46. GRB 050223: optical observations
  47. GRB050223 XMM-Newton observation
  48. INTEGRAL detection of GRB 050223
  49. GRB050223: No Swift UVOT Detection of Afterglow Emission
  50. GRB050223: ROTSE-III Optical Observations
  51. GRB 050223 Swift/BAT detection of a burst
  52. GRB 050223: Swift XRT Position
  53. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  54. GRB050219b: CORRECTION to time of UVOT observations
  55. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  56. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  57. GRB 050219b: CORRECTION to refined XRT position
  58. GRB 050219a: Optical observations from LCO
  59. GRB 050219b: Optical and near-IR observations from LCO
  60. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  61. GRB 050219b: Refined XRT position
  62. GRB 050219b: Swift-BAT detection of a burst
  63. GRB 050219b: CORRECTION: Swift XRT Position
  64. GRB 050219b: Swift XRT Position
  65. GRB 050219a, optical observations
  66. GRB 050219a: Refined XRT position
  67. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  68. GRB 050219: Swift-BAT detection of a burst
  69. GRB050215b: Swift UVOT Detection of Afterglow Emission
  70. GRB 050219: Prompt X-ray position
  71. GRB 050215B: Radio Observations
  72. GRB 050215b: XRT confirmation of IR afterglow candidate
  73. GRB050215b: P60 Optical Observations
  74. GRB 050215b: Swift XRT Source Variability
  75. GRB 050215B: candidate afterglow
  76. GRB 050215b : Lulin follow-up observation
  77. GRB 050215b, BOOTES-2 simultaneous optical observations
  78. GRB 050215B: UKIRT K-band imaging
  79. GRB 050215b: Swift XRT Observations
  80. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  81. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  82. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  83. GRB050215B: ROTSE-III optical observations
  84. GRB050215A: ROTSE-III Optical Observations
  85. short/hard GRB 050202, optical observations
  86. GRB 050128: Radio observations
  87. Further analysis of the short Swift-BAT GRB 050202
  88. GRB 050202: Second epoch radio observations
  89. GRB050202: Radio Observations
  90. GRB 050202: Short burst detected by Swift-BAT
  91. GRB 050128 Optical observation with REM
  92. SGR1806-20: Swift-BAT detection of a large normal burst
  93. GRB050128: Faulkes Telescope South observations
  94. GRB 050124: Radio Observations
  95. GRB 050128: near-infrared observations with REM
  96. GRB050128,optical observations
  97. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  98. GRB050126: Updated Swift XRT Position
  99. GRB 050126: Radio Observations
  100. GRB050128 Swift-BAT observations

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