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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"

37606 results found.

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

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