Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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"

41987 results found.

  1. Swift-BAT Trigger 145729 is not a GRB
  2. GRB 050713A: Swift/UVOT observation
  3. GRB 050713A : Swift-BAT Refined Analysis
  4. GRB050712: Swift UVOT Observation of Afterglow Emission
  5. GRB 050713A : Lulin R-band observation
  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. GRB 050713B
  11. GRB050709 : Chandra source optical counterpart
  12. GRB050713: Liverpool Telescope prompt observations
  13. GRB 050712, optical observations
  14. GRB050709: Candidate X-ray Afterglow from Chandra
  15. GRB 050713, R-band observations at NOT
  16. GRB 050713: ARC NIR Detections and Identification of Fading
  17. GRB050713: possible I-band afterglow
  18. GRB 050713: Swift detection of Bright Burst
  19. GRB 050713A: ROTSE-III Optical Limits
  20. GRB050712: XRT refined analysis
  21. GRB050709: Radio Observations
  22. GRB 050709: Swift UVOT and XRT observations
  23. GRB 050712: Swift-BAT Refined Analysis
  24. GRB050712: UVOT candidate optical counterpart
  25. GRB 050712: Swift XRT afterglow position
  26. GRB 050712: Swift detection of a weak burst
  27. GRB 050709: LCO40 Observations
  28. GRB050709, optical observations
  29. GRB050709: A Possible Short-Hard GRB Localized by HETE
  30. PROMPT Rc Observations of GRB 050709
  31. GRB 050525a: PROMPT VRcIc Detections
  32. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  33. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  34. GRB 050626 optical observations
  35. GRB 050626: Swift XRT observations
  36. GRB 050701
  37. GRB 050701, optical observations
  38. GRB 050408: ARC 3.5-meter NIR Observations
  39. GRB 050701: Refined XRT analysis
  40. Swift UVOT observations of GRB 050701
  41. GRB050701: Swift-BAT Refined analysis
  42. GRB 050701: Swift XRT afterglow position
  43. Swift trigger 143708 is really GRB 050701
  44. GRB 050607, radio observations
  45. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  46. GRB 050626 - Correction to GCN 3552
  47. GRB 050626 - a long GRB detected with INTEGRAL
  48. GRB 050525A: Swift Late-Time Decay Rate
  49. GRB050525a: HST Observations
  50. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  51. H3804: A Possible New XRB Detected by HETE
  52. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  53. XRF 050509c: Optical monitoring
  54. Konus-Wind observation of an intermediate burst from SGR 1806-20
  55. XRF050509c: Radio Detection
  56. GRB 050416(a): Host Galaxy Redshift Determination
  57. GRB 050607: MDM Observation
  58. GRB 050607 optical decay
  59. GRB 050607: RTT150 optical observations
  60. GRB050607: refined analysis of prompt REM observations
  61. Swift/UVOT observations of GRB050607
  62. GRB 050607 : Lulin R-band observation
  63. GRB 050607: PROMPT VRcIc Observations
  64. GRB 050607: RAPTOR-S Early Optical Limits
  65. GRB050607: KAIT optical limits
  66. GRB 050525a, Mid-Infrared Observations
  67. GRB 050607: Optical decay and spectral slope
  68. GRB 050607: MDM Observations
  69. GRB050607,optical observation
  70. GRB 050607 - XRT refined data analysis
  71. Optical Afterglow of GRB 050607
  72. GRB050607 optical limit by "Pi of the Sky"
  73. GRB050607: Swift Detection of a long GRB
  74. GRB050607: P60 Observations
  75. GRB050607: prompt REM observations
  76. GRB 050603: prediction of t_break
  77. Limits on a SN in the field of GRB 050509b
  78. GRB 050603: Redshift
  79. GRB 050603 - XRT data analysis of the first day
  80. Konus-Wind observation of GRB 050603
  81. GRB 050603: Analysis of UVOT data
  82. GRB050603: Fading Afterglow observed by Swift UVOT
  83. GRB050603, submillimetre observations
  84. GRB 050603: Swift XRT Position
  85. GRB050603: Radio Detection
  86. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  87. GRB 050603: Afterglow Identification from LCO
  88. GRB 050603: INTEGRAL shows it is not a short GRB
  89. Swift/BAT Detection of GRB050603
  90. GRB 050408: jet break in the XRT light curve
  91. GRB 050525a, infrared observations
  92. GRB 050525a, SMARTS optical/IR afterglow observations
  93. GRB050528, XRT observations
  94. Correction to GCN Circ 3502 on GRB 050528
  95. Swift-BAT GRB 050528: a soft burst
  96. Update on Swift-BAT GRB 050528 (Trigger 130679)
  97. GRB050528: BOOTES optical candidate (retraction)
  98. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  99. GRB050528: BOOTES optical candidate
  100. Possible GRB050528: no candidate from Liverpool Telescope

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov