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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"

43004 results found.

  1. GRB 050712: Swift detection of a weak burst
  2. GRB 050709: LCO40 Observations
  3. GRB050709, optical observations
  4. GRB050709: A Possible Short-Hard GRB Localized by HETE
  5. PROMPT Rc Observations of GRB 050709
  6. GRB 050525a: PROMPT VRcIc Detections
  7. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  8. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  9. GRB 050626: Swift XRT observations
  10. GRB 050701
  11. GRB 050701, optical observations
  12. GRB 050408: ARC 3.5-meter NIR Observations
  13. GRB 050701: Refined XRT analysis
  14. Swift UVOT observations of GRB 050701
  15. GRB050701: Swift-BAT Refined analysis
  16. GRB 050701: Swift XRT afterglow position
  17. Swift trigger 143708 is really GRB 050701
  18. GRB 050607, radio observations
  19. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  20. GRB 050626 - Correction to GCN 3552
  21. GRB 050626 - a long GRB detected with INTEGRAL
  22. GRB050525a: HST Observations
  23. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  24. H3804: A Possible New XRB Detected by HETE
  25. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  26. Konus-Wind observation of an intermediate burst from SGR 1806-20
  27. IBAS Alert #2512 is NOT a GRB
  28. XRF050509c: Radio Detection
  29. GRB 050416(a): Host Galaxy Redshift Determination
  30. GRB 050607: MDM Observation
  31. GRB 050607 optical decay
  32. GRB 050607: RTT150 optical observations
  33. GRB050607: refined analysis of prompt REM observations
  34. Swift/UVOT observations of GRB050607
  35. GRB 050607: PROMPT VRcIc Observations
  36. GRB 050607: RAPTOR-S Early Optical Limits
  37. GRB050607: KAIT optical limits
  38. GRB 050525a, Mid-Infrared Observations
  39. GRB 050607: Optical decay and spectral slope
  40. GRB 050607: MDM Observations
  41. GRB 050607 - XRT refined data analysis
  42. GRB050607 optical limit by "Pi of the Sky"
  43. GRB050607: P60 Observations
  44. GRB050607: prompt REM observations
  45. GRB 050603: prediction of t_break
  46. Limits on a SN in the field of GRB 050509b
  47. GRB 050603: Redshift
  48. GRB 050603 - XRT data analysis of the first day
  49. Konus-Wind observation of GRB 050603
  50. GRB 050603: Analysis of UVOT data
  51. GRB050603, submillimetre observations
  52. GRB 050603: Swift XRT Position
  53. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  54. GRB 050603: Afterglow Identification from LCO
  55. GRB 050603: INTEGRAL shows it is not a short GRB
  56. Swift/BAT Detection of GRB050603
  57. GRB 050408: jet break in the XRT light curve
  58. GRB 050525a, infrared observations
  59. GRB 050525a, SMARTS optical/IR afterglow observations
  60. GRB050528, XRT observations
  61. Swift-BAT GRB 050528: a soft burst
  62. Update on Swift-BAT GRB 050528 (Trigger 130679)
  63. GRB050528: BOOTES optical candidate (retraction)
  64. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  65. GRB050528: BOOTES optical candidate
  66. Possible GRB050528: no candidate from Liverpool Telescope
  67. Swift-BAT detection of possible GRB 050528
  68. GRB050525a: Radio Observations
  69. GRB 050509b: refined XRT/Chandra afterglow position analysis
  70. GRB 050525: RTT150, Optical observations
  71. GRB050525a: optical upper limits
  72. GRB 050525a: SARA Observations
  73. GRB 050525B: Swift-BAT observations
  74. GRB 050525: MITSuME Optical Observation in VRI
  75. GRB 050525a: MDM Observations
  76. GRB050525A,optical observation
  77. GRB 050525 : Lulin optical afterglow observations
  78. GRB050525: Super-LOTIS observations
  79. GRB 050525, spectral lag pseudo-redshift
  80. GRB 050525a: Gemini/GMOS Spectra
  81. GRB 050525: BART optical observation
  82. GRB 050525A: BOOTES simultaneous optical observations
  83. GRB 050525A: Swift-BAT refined analysis
  84. GRB050525: Optical observations
  85. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  86. Swift/UVOT UV and optical detections of GRB 050525
  87. Konus-Wind observation of GRB 050525
  88. GRB 050525: TAROT observations of the early afterglow
  89. INTEGRAL detection of GRB 050525
  90. GRB 050525, infrared observations
  91. GRB 050525: Optical observation
  92. GRB 050525: observatons of the optical afterglow
  93. GRB050525: ROTSE-III Refined Analysis
  94. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  95. XRF050522: NIR observations of XRT candidate
  96. XRF 050522: Swift XRT refined analysis
  97. Swift/UVOT observation of XRF 050522
  98. GRB 050509A: Further I-band imaging
  99. XRF 050522: Continued NIR P200 Monitoring
  100. RBO Observations of GRB050522

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