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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"

37216 results found.

  1. GRB 050401: Prompt XRT position
  2. Retraction of three Swift GRB triggers
  3. GRB050331: No Afterglow Detected
  4. Swift-BAT detection of GRB 050331b
  5. GRB 050331: Swift UVOT Source
  6. Swift-BAT detection of GRB 050331
  7. GRB 050331: Swift XRT Position
  8. GRB050319: radio observation
  9. Konus-Wind observation of GRB 050326
  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, color indices
  19. GRB050319: optical observation, March 20-22
  20. GRB050319: RTT150 Optical Observations
  21. Swift-BAT trigger 112060 is not a real GRB
  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. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  26. GRB050319: VLA Observations
  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. GRB 050318: SWIFT-UVOT refined analysis
  34. GRB 050318: Absorption redshift from Magellan
  35. GRB 050319: Optical observation
  36. GRB 050319 : Confirmation of optical afterglow decay
  37. GRB 050319: Swift-BAT refined analysis
  38. GRB050319,optical observation
  39. Swift Detection of GRB 050319
  40. GRB 050319: Detection of Possible Optical Counterpart
  41. GRB 050318: Swift/UVOT detection of afterglow emission
  42. GRB 050318: Magellan optical afterglow identification
  43. GRB050318: Swift XRT position
  44. RXTE Observations of GRB050318
  45. Swift-BAT detection of GRB 050318
  46. GRB 050315, SMARTS optical afterglow decay
  47. GRB050223: analysis of the XMM-Newton observation
  48. GRB050316: MASTER before, simultanious and follow up optical
  49. GRB 050306: ROTSE-III early limits
  50. GRB050316: MASTER optical observations
  51. GRB 050315: Swift-BAT further refined analysis
  52. GRB 050315, SMARTS optical/IR afterglow observations
  53. GRB 050315 I-band observations
  54. GRB050315: Radio afterglow
  55. GRB 050315: Absorption redshift
  56. GRB 050315: Optical afterglow identification
  57. GRB050315: Swift-BAT Refined analysis
  58. Non-detection of GRB050315 in ATCA Radio Observations
  59. GRB 050315: Swift XRT Position
  60. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  61. GRB 050315: Early Observations with Swift/UVOT
  62. Swift-BAT detection of GRB 050315
  63. GRB 050306: Radio Observations
  64. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  65. GRB050309: CONCAM pre-trigger and trigger coincident optical
  66. GRB 050306: optical afterglow
  67. GRB 050126: Redshift determination
  68. Swift-BAT trigger 107873: No Swift XRT counterpart
  69. GRB 050306: Confirmation of X-ray afterglow
  70. GRB 050309, Early optical limits from RAPTOR
  71. GRB 050306: further TAROT optical data
  72. GRB050309: Early optical limit from P60
  73. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  74. GRB 050309 : Lulin R-band observation
  75. Swift 107873: P60 Optical Observations
  76. GRB 050306: CORRECTION to date of observation
  77. GRB 050306: R-band observations
  78. GRB 050306: No Swift UVOT Optical Counterpart Detected
  79. GRB 050306: REM optical-infrared observations
  80. GRB 050306: Possible X-ray Afterglow Position from the Swift
  81. Swift trigger 107518: optical observation
  82. GRB 050306: TAROT optical observations
  83. GRB 050306,optical observation
  84. GRB 050306: Swift-BAT detection of a long burst
  85. GRB 050126: Confirmation of the NIR afterglow candidate
  86. PROMPT VRcIc Observations of GRB 050223
  87. XRF/GRB 050215B: Radio Observations
  88. XMM-Newton Images of GRB 050223
  89. GRB 050219b: candidate NIR afterglow
  90. IBAS GRB Alert #2321
  91. GRB 050223: optical observations
  92. INTEGRAL detection of GRB 050223
  93. GRB 050223 : Planned XMM-Newton observation
  94. GRB050223: ROTSE-III Optical Observations
  95. GRB 050223 Swift/BAT detection of a burst
  96. GRB 050223: Swift XRT Position
  97. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  98. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  99. GRB 050219b: CORRECTION to refined XRT position
  100. GRB 050219a: Optical observations from LCO

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