Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

36240 results found.

  1. GRB 050717: LCO near-IR observations
  2. Swift/UVOT Observations of GRB 050717
  3. GRB 050717: Swift-BAT refined analysis
  4. GRB 050717: Refined XRT analysis.
  5. GRB050712: optical limits
  6. Swift detection of GRB 050717
  7. GRB 050716 - UKIRT identification of candidate afterglow
  8. Swift UVOT Observations of GRB 050716
  9. GRB 050716: Refined XRT analysis.
  10. GRB 050716: Lulin B and R band optical observations
  11. GRB050716, optical observation
  12. GRB 050716: Optical Observations
  13. GRB050716: Faulkes North Telescope observation
  14. Swift/BAT detection of GRB 050716
  15. GRB 050715: Swift-BAT detection
  16. Swift UVOT Observations of GRB 050714B
  17. Konus-Wind observation of GRB 050713A
  18. GRB 050714B: refined XRT analysis
  19. GRB 050713b: RTT150 optical observations
  20. GRB 050714B: candidate afterglow does not fade
  21. GRB050714B: Refined analysis of the Swift-BAT burst
  22. GRB 050714B: optical afterglow
  23. Swift detection of a long transient (GRB 050714B?)
  24. GRB 050709: optical afterglow candidate
  25. GRB 050714, R-band candidate
  26. GRB 050714: Swift XRT afterglow position
  27. GRB 050714, optical observations
  28. GRB 050714A: ROTSE-III Optical Limits
  29. GRB 050714 - A long GRB detected with INTEGRAL
  30. GRB 050713A: XRT refined analysis
  31. GRB 050709: Spectroscopy
  32. GRB 050713A: RAPTOR detection of early optical emission
  33. GRB050713B :Swift/UVOT observations
  34. GRB050712: TNG R-band observations
  35. GRB 050713B: Swift-BAT Refined Analysis
  36. Swift-BAT Trigger 145729 is not a GRB
  37. GRB 050713A: Swift/UVOT observation
  38. GRB 050713A : Swift-BAT Refined Analysis
  39. GRB 050713A : Lulin R-band observation
  40. GRB 050713A XMM-Newton observation
  41. GRB 050713b : Lulin R-band observations
  42. GRB050713B: Faulkes North Telescope observation
  43. RBO RI observations of GRB 050713A
  44. GRB 050713B
  45. GRB050709 : Chandra source optical counterpart
  46. GRB050713: Liverpool Telescope prompt observations
  47. GRB 050712, optical observations
  48. GRB 050713 : Planned XMM-Newton observation
  49. GRB050709: Candidate X-ray Afterglow from Chandra
  50. GRB 050713, R-band observations at NOT
  51. GRB 050713: ARC NIR Detections and Identification of Fading
  52. GRB050713: possible I-band afterglow
  53. GRB 050713: Swift detection of Bright Burst
  54. GRB 050713A: ROTSE-III Optical Limits
  55. GRB 050709: Swift UVOT and XRT observations
  56. GRB 050712: Swift-BAT Refined Analysis
  57. GRB 050712: Swift XRT afterglow position
  58. GRB 050712: Swift detection of a weak burst
  59. GRB 050709: LCO40 Observations
  60. GRB050709: A Possible Short-Hard GRB Localized by HETE
  61. PROMPT Rc Observations of GRB 050709
  62. GRB 050525a: PROMPT VRcIc Detections
  63. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  64. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  65. GRB 050626 optical observations
  66. GRB 050626: Swift XRT observations
  67. GRB 050701
  68. GRB 050701, optical observations
  69. GRB 050408: ARC 3.5-meter NIR Observations
  70. GRB 050701: Refined XRT analysis
  71. Swift UVOT observations of GRB 050701
  72. GRB 050701: Swift XRT afterglow position
  73. Swift trigger 143708 is really GRB 050701
  74. GRB 050607, radio observations
  75. GRB 050626 - Correction to GCN 3552
  76. GRB 050626 - a long GRB detected with INTEGRAL
  77. GRB 050525A: Swift Late-Time Decay Rate
  78. H3804: A Possible New XRB Detected by HETE
  79. XRF 050509c: Optical monitoring
  80. IBAS Alert #2512 is NOT a GRB
  81. GRB 050416(a): Host Galaxy Redshift Determination
  82. GRB 050607: MDM Observation
  83. GRB 050607 optical decay
  84. GRB 050607: RTT150 optical observations
  85. GRB 050607 : Lulin R-band observation
  86. GRB 050607: PROMPT VRcIc Observations
  87. GRB 050607: RAPTOR-S Early Optical Limits
  88. GRB 050525a, Mid-Infrared Observations
  89. GRB 050607: Optical decay and spectral slope
  90. GRB 050607: MDM Observations
  91. GRB050607,optical observation
  92. GRB 050607 - XRT refined data analysis
  93. Optical Afterglow of GRB 050607
  94. GRB050607 optical limit by "Pi of the Sky"
  95. GRB050607: Swift Detection of a long GRB
  96. GRB050607: P60 Observations
  97. GRB 050603: prediction of t_break
  98. Limits on a SN in the field of GRB 050509b
  99. GRB 050603: Redshift
  100. GRB 050603 - XRT data analysis of the first day

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