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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"

45547 results found.

  1. GRB 070330: TAROT La Silla observatory optical observations
  2. GRB 070330: Swift-XRT refined analysis
  3. GRB 070330 - Watcher Observations
  4. GRB 070330: Swift detection of a burst
  5. GRB 070328: pseudo-z~2.75 from spectral parameters of the prompt
  6. Konus-Wind observation of GRB 070328
  7. GRB 070328: Swift/UVOT Upper Limits
  8. long burst from SGR 1806-20 detected on March 26
  9. GRB 070328: Swift/XRT Refined Analysis
  10. GRB 070328 : Suzaku ToO follow up starts
  11. GRB 070328, Swift-BAT refined analysis
  12. GRB 070328: Swift detection of a burst
  13. GRB070220: optical observations
  14. GRB070208: optical observations
  15. GRB070223: confirmation of nIR and optical afterglow
  16. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  17. GRB 070311, deep optical photometry
  18. Short-Hard GRB 070209: PROMPT Observations
  19. GRB 070318: Gemini + Magellan spectra
  20. GRB 070318: absorption-line redshift
  21. GRB070318: Swift UVOT continuing observations
  22. GRB070318: Swift-XRT refined analysis
  23. GRB 070318: Swift/UVOT Continued Observations
  24. GRB 070318, Swift-BAT refined analysis
  25. IBAS Alert n. 4176: not a GRB
  26. GRB 070318: Swift detection of a burst with an optical afterglow
  27. GRB 070311: Late Central Engine Activity Optical Flare??
  28. GRB 070311: MDM Optical Monitoring
  29. VLA observation of GRB 070311
  30. GRB 070311: Tautenburg sees afterglow fading
  31. IBAS Alert n. 4169: not a GRB
  32. GRB 070311: Optical observation.
  33. GRB 070311: Optical Brightening
  34. GRB 070306: possible emission-line redshift
  35. GRB 070311: SARA upper limit
  36. GRB 070309: variability of the XRT afterglow candidate
  37. GRB 070311: MDM Optical Follow-up
  38. GRB 070311: RAPTOR Detection of Optical Emission
  39. GRB070311: FRAM early follow-up limit
  40. GRB 070311: P60 Observations
  41. GRB 070311: MDM Optical Detection
  42. GRB 070311: Swift/UVOT Upper Limits
  43. GRB 070311: MITSuME Okayama Optical Observation
  44. GRB 070311: Swift-XRT refined analysis
  45. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  46. GRB 070311: REM candidate afterglow
  47. GRB 070311: a long GRB detected by INTEGRAL
  48. GRB060901: Candidate optical afterglow
  49. GRB070309: Swift/XRT possible afterglow detection
  50. GRB 070125: Chandra X-ray Confirmation of Jet Break
  51. GRB 070309: Swift/UVOT Upper Limits
  52. GRB 070306, optical observation
  53. Swift UVOT Finding Charts for GRB 070309
  54. GRB 070309: A long GRB detected by INTEGRAL
  55. GRB 070125: X-ray light curve analysis
  56. VLA observation of GRB 070306
  57. IBAS Alert 4162: Not a GRB
  58. GRB 070306: NOT observations
  59. GRB 070306 Swift/UVOT refined analysis
  60. GRB070306: confirmation of near infrared afterglow
  61. GRB 070306: ART-3 early optical and near infrared constraints
  62. GRB 070306: IR observations and candidate afterglow
  63. GRB 070306, Swift-BAT refined analysis
  64. GRB 070306: XRT Team Refined Analysis
  65. GRB 070306: Optical and IR observations with KANATA
  66. GRB070306 - SDSS Pre-burst Observations
  67. GRB 070306: Swift detection of a burst
  68. GRB 070223: NIR observations at WHT
  69. GRB070227: Swift-XRT refined analysis
  70. GRB 060605 new redshift
  71. GRB 070125, deep late-time optical observation
  72. VLA observation of GRB 070224
  73. GRB 070227: optical observations
  74. GRB 070223: Optical Observations
  75. GRB 070227: optical observations
  76. GRB 070227: Swift/UVOT Upper Limits
  77. GRB 070227: TAROT La Silla observatory optical observations
  78. GRB 070227, Swift-BAT refined analysis
  79. GRB070227: possible X-ray afterglow detection
  80. GRB 070227: Swift detection of a burst in ground analysis
  81. GRB 920925C: optical afterglow candidate
  82. GRB 070224: Optical afterglow confirmation
  83. IBAS Alert n. 4144: not a GRB
  84. GRB 070224: Swift/UVOT Upper Limits
  85. GRB070224: Swift-XRT Astrometrically Corrected Position
  86. VLA observation of GRB 070223
  87. VLA observation of GRB 070220
  88. GRB070224: Magellan Imaging Observations
  89. GRB 070224: WHT K-band imaging
  90. GRB 070224: MDM Observations
  91. GRB070224: Gemini Imaging Observations
  92. GRB 070224: SARA upper limit
  93. GRB070224: Swift-XRT Refined Analysis
  94. GRB 070224: optical afterglow candidate
  95. GRB 070224, Swift-BAT refined analysis
  96. GRB 070224: MASTER-Net refind analysis
  97. GRB 070224: MASTER-VWF-Kislovodsk observations
  98. GRB 070224: Swift detection of a burst
  99. GRB 070223: Optical observations
  100. RHESSI Spectrum of GRB070220

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