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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"

43717 results found.

  1. GRB 050326 BAT refined analysis
  2. GRB050326: delayed XRT observation
  3. Swift-BAT detection of a bright GRB 050326
  4. GRB050319, optical observations
  5. GRB050319, color indices
  6. GRB050319: optical observation, March 20-22
  7. GRB050319: RTT150 Optical Observations
  8. Swift-BAT detection of a bright outburst from SGR1806-20
  9. Swift-BAT trigger 112060 is not a real GRB
  10. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  11. GRB 050319: ROTSE-III Refined Analysis
  12. GRB 050318: Swift-BAT refined analysis
  13. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  14. GRB050319: VLA Observations
  15. GRB 050319 R band observations
  16. GRB 050319: Swift-UVOT detection of the afterglow
  17. GRB 050315: Variability Analysis of Swift BAT Time History
  18. GRB050319: Radio Observations
  19. GRB 050319: NIR afterglow candidate
  20. GRB 050319:Near IR afterglow
  21. GRB050319: BR optical photometry
  22. GRB 050318: SWIFT-UVOT refined analysis
  23. GRB 050318: Absorption redshift from Magellan
  24. GRB 050319: Swift-BAT refined analysis
  25. GRB050319,optical observation
  26. Swift Detection of GRB 050319
  27. GRB 050319: Detection of Possible Optical Counterpart
  28. GRB 050318: Swift/UVOT detection of afterglow emission
  29. GRB 050318: Magellan optical afterglow identification
  30. GRB050318: Swift XRT position
  31. RXTE Observations of GRB050318
  32. Swift-BAT detection of GRB 050318
  33. GRB 050315, SMARTS optical afterglow decay
  34. GRB050223: analysis of the XMM-Newton observation
  35. GRB050316: MASTER before, simultanious and follow up optical
  36. GRB 050306: ROTSE-III early limits
  37. GRB 050315: Swift-BAT further refined analysis
  38. GRB 050315 I-band observations
  39. GRB050315: Radio afterglow
  40. GRB 050315: Absorption redshift
  41. GRB 050315: Optical afterglow identification
  42. GRB050315: Swift-BAT Refined analysis
  43. Non-detection of GRB050315 in ATCA Radio Observations
  44. GRB 050315: Swift XRT Position
  45. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  46. GRB 050315: Early Observations with Swift/UVOT
  47. Swift-BAT detection of GRB 050315
  48. GRB050223: No XMM-Newton OM detection of afterglow emission
  49. GRB 050306: Radio Observations
  50. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  51. GRB050309: CONCAM pre-trigger and trigger coincident optical
  52. GRB 050306: optical afterglow
  53. GRB 050126: Redshift determination
  54. Swift-BAT trigger 107873: No Swift XRT counterpart
  55. GRB 050306: Confirmation of X-ray afterglow
  56. GRB 050309, Early optical limits from RAPTOR
  57. GRB 050306: further TAROT optical data
  58. GRB050309: Early optical limit from P60
  59. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  60. GRB 050309 : Lulin R-band observation
  61. Swift 107873: P60 Optical Observations
  62. GRB 050306: CORRECTION to date of observation
  63. GRB 050306: R-band observations
  64. GRB 050306: No Swift UVOT Optical Counterpart Detected
  65. GRB 050306: REM optical-infrared observations
  66. GRB 050306: Possible X-ray Afterglow Position from the Swift
  67. Swift trigger 107518: optical observation
  68. GRB 050306: TAROT optical observations
  69. GRB 050306,optical observation
  70. GRB 050306: Swift-BAT detection of a long burst
  71. Ongoing activity of SGR 1806-20 after the giant flare
  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. XMM-Newton Images of GRB 050223
  77. GRB 050219b: candidate NIR afterglow
  78. IBAS GRB Alert #2321
  79. Confirmed XRF nature for GRB050215b
  80. GRB 050223: optical observations
  81. GRB050223 XMM-Newton observation
  82. INTEGRAL detection of GRB 050223
  83. GRB050223: No Swift UVOT Detection of Afterglow Emission
  84. GRB050223: ROTSE-III Optical Observations
  85. GRB 050223 Swift/BAT detection of a burst
  86. GRB 050223: Swift XRT Position
  87. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  88. GRB050219b: CORRECTION to time of UVOT observations
  89. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  90. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  91. GRB 050219b: CORRECTION to refined XRT position
  92. GRB 050219a: Optical observations from LCO
  93. GRB 050219b: Optical and near-IR observations from LCO
  94. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  95. GRB 050219b: Refined XRT position
  96. GRB 050219b: Swift-BAT detection of a burst
  97. GRB 050219b: CORRECTION: Swift XRT Position
  98. GRB 050219b: Swift XRT Position
  99. GRB 050219a, optical observations
  100. GRB 050219a: Refined XRT position

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