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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"

32697 results found.

  1. GRB 050713B: Swift-BAT Refined Analysis
  2. Swift-BAT Trigger 145729 is not a GRB
  3. GRB 050713A: Swift/UVOT observation
  4. GRB 050713A : Swift-BAT Refined Analysis
  5. GRB050712: Swift UVOT Observation of Afterglow Emission
  6. GRB 050713A XMM-Newton observation
  7. GRB 050713b : Lulin R-band observations
  8. GRB050713B: Faulkes North Telescope observation
  9. RBO RI observations of GRB 050713A
  10. GRB050709 : Chandra source optical counterpart
  11. GRB050713: Liverpool Telescope prompt observations
  12. GRB 050712, optical observations
  13. GRB050709: Candidate X-ray Afterglow from Chandra
  14. GRB 050713: ARC NIR Detections and Identification of Fading
  15. GRB050713: possible I-band afterglow
  16. GRB 050713A: ROTSE-III Optical Limits
  17. GRB050712: XRT refined analysis
  18. GRB050709: Radio Observations
  19. GRB 050709: Swift UVOT and XRT observations
  20. GRB 050712: Swift-BAT Refined Analysis
  21. GRB050712: UVOT candidate optical counterpart
  22. GRB 050712: Swift XRT afterglow position
  23. GRB 050709: LCO40 Observations
  24. GRB050709, optical observations
  25. GRB050709: A Possible Short-Hard GRB Localized by HETE
  26. GRB 050525a: PROMPT VRcIc Detections
  27. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  28. GRB 050626 optical observations
  29. GRB 050701
  30. GRB 050701, optical observations
  31. GRB 050408: ARC 3.5-meter NIR Observations
  32. GRB 050701: Refined XRT analysis
  33. Swift UVOT observations of GRB 050701
  34. GRB050701: Swift-BAT Refined analysis
  35. GRB 050701: Swift XRT afterglow position
  36. GRB 050607, radio observations
  37. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  38. GRB 050626 - Correction to GCN 3552
  39. GRB 050626 - a long GRB detected with INTEGRAL
  40. GRB 050525A: Swift Late-Time Decay Rate
  41. GRB050525a: HST Observations
  42. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  43. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  44. XRF 050509c: Optical monitoring
  45. XRF050509c: Radio Detection
  46. GRB 050416(a): Host Galaxy Redshift Determination
  47. GRB 050607: MDM Observation
  48. GRB 050607: RTT150 optical observations
  49. GRB050607: refined analysis of prompt REM observations
  50. Swift/UVOT observations of GRB050607
  51. GRB 050607 : Lulin R-band observation
  52. GRB 050607: PROMPT VRcIc Observations
  53. GRB 050607: RAPTOR-S Early Optical Limits
  54. GRB050607: KAIT optical limits
  55. GRB 050525a, Mid-Infrared Observations
  56. GRB 050607: MDM Observations
  57. GRB050607,optical observation
  58. GRB 050607 - XRT refined data analysis
  59. GRB 050603: prediction of t_break
  60. Limits on a SN in the field of GRB 050509b
  61. GRB 050603: Redshift
  62. GRB 050603 - XRT data analysis of the first day
  63. Konus-Wind observation of GRB 050603
  64. GRB 050603: Analysis of UVOT data
  65. GRB050603: Fading Afterglow observed by Swift UVOT
  66. GRB050603, submillimetre observations
  67. GRB 050603: Swift XRT Position
  68. GRB050603: Radio Detection
  69. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  70. GRB 050603: Afterglow Identification from LCO
  71. GRB 050603: INTEGRAL shows it is not a short GRB
  72. GRB 050408: jet break in the XRT light curve
  73. GRB 050525a, infrared observations
  74. GRB 050525a, SMARTS optical/IR afterglow observations
  75. Correction to GCN Circ 3502 on GRB 050528
  76. Swift-BAT GRB 050528: a soft burst
  77. Update on Swift-BAT GRB 050528 (Trigger 130679)
  78. GRB050528: BOOTES optical candidate (retraction)
  79. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  80. GRB050525a: Radio Observations
  81. GRB 050509b: refined XRT/Chandra afterglow position analysis
  82. GRB050525a: optical upper limits
  83. GRB 050525a: SARA Observations
  84. GRB 050525B: Swift-BAT observations
  85. GRB 050525: MITSuME Optical Observation in VRI
  86. GRB 050525a: MDM Observations
  87. GRB050525A,optical observation
  88. GRB 050525 : Lulin optical afterglow observations
  89. GRB050525: Super-LOTIS observations
  90. GRB 050525, spectral lag pseudo-redshift
  91. GRB 050525a: Gemini/GMOS Spectra
  92. GRB050306: optical afterglow not confirmed
  93. GRB 050525: BART optical observation
  94. GRB 050525A: BOOTES simultaneous optical observations
  95. GRB 050525A: Swift-BAT refined analysis
  96. GRB050525: Optical observations
  97. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  98. Swift/UVOT UV and optical detections of GRB 050525
  99. Konus-Wind observation of GRB 050525
  100. GRB 050525: TAROT observations of the early afterglow

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