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"

36214 results found.

  1. GRB 050713b: RTT150 optical observations
  2. GRB 050714B: candidate afterglow does not fade
  3. GRB050714B: Refined analysis of the Swift-BAT burst
  4. GRB 050714B: optical afterglow
  5. Swift detection of a long transient (GRB 050714B?)
  6. GRB 050709: optical afterglow candidate
  7. GRB 050714, R-band candidate
  8. GRB 050714: Swift XRT afterglow position
  9. GRB 050714, optical observations
  10. GRB 050714A: ROTSE-III Optical Limits
  11. GRB 050714 - A long GRB detected with INTEGRAL
  12. GRB 050713A: XRT refined analysis
  13. GRB 050709: Spectroscopy
  14. GRB 050713A: RAPTOR detection of early optical emission
  15. GRB050713B :Swift/UVOT observations
  16. GRB050712: TNG R-band observations
  17. GRB 050713B: Swift-BAT Refined Analysis
  18. Swift-BAT Trigger 145729 is not a GRB
  19. GRB 050713A: Swift/UVOT observation
  20. GRB 050713A : Swift-BAT Refined Analysis
  21. GRB 050713A : Lulin R-band observation
  22. GRB 050713A XMM-Newton observation
  23. GRB 050713b : Lulin R-band observations
  24. GRB050713B: Faulkes North Telescope observation
  25. RBO RI observations of GRB 050713A
  26. GRB 050713B
  27. GRB050709 : Chandra source optical counterpart
  28. GRB050713: Liverpool Telescope prompt observations
  29. GRB 050712, optical observations
  30. GRB 050713 : Planned XMM-Newton observation
  31. GRB050709: Candidate X-ray Afterglow from Chandra
  32. GRB 050713, R-band observations at NOT
  33. GRB 050713: ARC NIR Detections and Identification of Fading
  34. GRB050713: possible I-band afterglow
  35. GRB 050713: Swift detection of Bright Burst
  36. GRB 050713A: ROTSE-III Optical Limits
  37. GRB 050709: Swift UVOT and XRT observations
  38. GRB 050712: Swift-BAT Refined Analysis
  39. GRB 050712: Swift XRT afterglow position
  40. GRB 050712: Swift detection of a weak burst
  41. GRB 050709: LCO40 Observations
  42. GRB050709: A Possible Short-Hard GRB Localized by HETE
  43. PROMPT Rc Observations of GRB 050709
  44. GRB 050525a: PROMPT VRcIc Detections
  45. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  46. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  47. GRB 050626 optical observations
  48. GRB 050626: Swift XRT observations
  49. GRB 050701
  50. GRB 050701, optical observations
  51. GRB 050408: ARC 3.5-meter NIR Observations
  52. GRB 050701: Refined XRT analysis
  53. Swift UVOT observations of GRB 050701
  54. GRB 050701: Swift XRT afterglow position
  55. Swift trigger 143708 is really GRB 050701
  56. GRB 050607, radio observations
  57. GRB 050626 - Correction to GCN 3552
  58. GRB 050626 - a long GRB detected with INTEGRAL
  59. GRB 050525A: Swift Late-Time Decay Rate
  60. H3804: A Possible New XRB Detected by HETE
  61. XRF 050509c: Optical monitoring
  62. IBAS Alert #2512 is NOT a GRB
  63. GRB 050416(a): Host Galaxy Redshift Determination
  64. GRB 050607: MDM Observation
  65. GRB 050607 optical decay
  66. GRB 050607: RTT150 optical observations
  67. GRB 050607 : Lulin R-band observation
  68. GRB 050607: PROMPT VRcIc Observations
  69. GRB 050607: RAPTOR-S Early Optical Limits
  70. GRB 050525a, Mid-Infrared Observations
  71. GRB 050607: Optical decay and spectral slope
  72. GRB 050607: MDM Observations
  73. GRB050607,optical observation
  74. GRB 050607 - XRT refined data analysis
  75. Optical Afterglow of GRB 050607
  76. GRB050607 optical limit by "Pi of the Sky"
  77. GRB050607: Swift Detection of a long GRB
  78. GRB050607: P60 Observations
  79. GRB 050603: prediction of t_break
  80. Limits on a SN in the field of GRB 050509b
  81. GRB 050603: Redshift
  82. GRB 050603 - XRT data analysis of the first day
  83. Konus-Wind observation of GRB 050603
  84. GRB 050603: Analysis of UVOT data
  85. GRB 050603: Swift XRT Position
  86. GRB050603: Radio Detection
  87. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  88. GRB 050603: Afterglow Identification from LCO
  89. GRB 050603: INTEGRAL shows it is not a short GRB
  90. GRB 050408: jet break in the XRT light curve
  91. GRB 050525a, infrared observations
  92. GRB 050525a, SMARTS optical/IR afterglow observations
  93. Correction to GCN Circ 3502 on GRB 050528
  94. GRB050528: updated Liverpool Telescope limits
  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