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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"

42852 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. GRB050713B: Faulkes North Telescope observation
  8. RBO RI observations of GRB 050713A
  9. GRB 050713B
  10. GRB050713: Liverpool Telescope prompt observations
  11. GRB 050712, optical observations
  12. GRB050709: Candidate X-ray Afterglow from Chandra
  13. GRB 050713, R-band observations at NOT
  14. GRB050713: possible I-band afterglow
  15. GRB 050713: Swift detection of Bright Burst
  16. GRB050712: XRT refined analysis
  17. GRB050709: Radio Observations
  18. GRB 050709: Swift UVOT and XRT observations
  19. GRB 050712: Swift-BAT Refined Analysis
  20. GRB050712: UVOT candidate optical counterpart
  21. GRB 050712: Swift XRT afterglow position
  22. GRB 050712: Swift detection of a weak burst
  23. GRB 050709: LCO40 Observations
  24. GRB050709, optical observations
  25. GRB050709: A Possible Short-Hard GRB Localized by HETE
  26. PROMPT Rc Observations of GRB 050709
  27. GRB 050525a: PROMPT VRcIc Detections
  28. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  29. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  30. GRB 050626 optical observations
  31. GRB 050626: Swift XRT observations
  32. GRB 050701, optical observations
  33. GRB 050408: ARC 3.5-meter NIR Observations
  34. GRB 050701: Refined XRT analysis
  35. Swift UVOT observations of GRB 050701
  36. GRB050701: Swift-BAT Refined analysis
  37. GRB 050701: Swift XRT afterglow position
  38. Swift trigger 143708 is really GRB 050701
  39. GRB 050607, radio observations
  40. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  41. GRB 050626 - a long GRB detected with INTEGRAL
  42. GRB 050525A: Swift Late-Time Decay Rate
  43. GRB050525a: HST Observations
  44. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  45. H3804: A Possible New XRB Detected by HETE
  46. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  47. XRF 050509c: Optical monitoring
  48. Konus-Wind observation of an intermediate burst from SGR 1806-20
  49. IBAS Alert #2512 is NOT a GRB
  50. XRF050509c: Radio Detection
  51. GRB 050416(a): Host Galaxy Redshift Determination
  52. GRB 050607: MDM Observation
  53. GRB 050607 optical decay
  54. GRB 050607: RTT150 optical observations
  55. GRB050607: refined analysis of prompt REM observations
  56. Swift/UVOT observations of GRB050607
  57. GRB 050607: PROMPT VRcIc Observations
  58. GRB050607: KAIT optical limits
  59. GRB 050525a, Mid-Infrared Observations
  60. GRB 050607: Optical decay and spectral slope
  61. GRB 050607 - XRT refined data analysis
  62. Optical Afterglow of GRB 050607
  63. GRB050607: Swift Detection of a long GRB
  64. GRB050607: P60 Observations
  65. GRB050607: prompt REM observations
  66. GRB 050603: prediction of t_break
  67. Limits on a SN in the field of GRB 050509b
  68. GRB 050603: Redshift
  69. GRB 050603 - XRT data analysis of the first day
  70. Konus-Wind observation of GRB 050603
  71. GRB050603: Fading Afterglow observed by Swift UVOT
  72. GRB050603, submillimetre observations
  73. GRB 050603: Swift XRT Position
  74. GRB050603: Radio Detection
  75. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  76. GRB 050603: Afterglow Identification from LCO
  77. GRB 050603: INTEGRAL shows it is not a short GRB
  78. Swift/BAT Detection of GRB050603
  79. GRB 050408: jet break in the XRT light curve
  80. GRB 050525a, infrared observations
  81. GRB 050525a, SMARTS optical/IR afterglow observations
  82. GRB050528, XRT observations
  83. GRB050528: updated Liverpool Telescope limits
  84. Swift-BAT GRB 050528: a soft burst
  85. Update on Swift-BAT GRB 050528 (Trigger 130679)
  86. GRB050528: BOOTES optical candidate (retraction)
  87. GRB050528: BOOTES optical candidate
  88. Possible GRB050528: no candidate from Liverpool Telescope
  89. Swift-BAT detection of possible GRB 050528
  90. GRB050525a: Radio Observations
  91. GRB 050509b: refined XRT/Chandra afterglow position analysis
  92. GRB 050525: RTT150, Optical observations
  93. GRB050525a: optical upper limits
  94. GRB 050525a: SARA Observations
  95. GRB 050525B: Swift-BAT observations
  96. GRB 050525: MITSuME Optical Observation in VRI
  97. GRB 050525a: MDM Observations
  98. GRB050525A,optical observation
  99. GRB050525: Super-LOTIS observations
  100. GRB 050525, spectral lag pseudo-redshift

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