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"

22215 results found.

  1. GRB 050713b: RTT150 optical observations
  2. Swift detection of a long transient (GRB 050714B?)
  3. GRB 050714, optical observations
  4. GRB 050709: Spectroscopy
  5. GRB050713B :Swift/UVOT observations
  6. GRB050712: TNG R-band observations
  7. GRB050712: Swift UVOT Observation of Afterglow Emission
  8. GRB 050713A : Lulin R-band observation
  9. GRB 050713b : Lulin R-band observations
  10. GRB050713B: Faulkes North Telescope observation
  11. RBO RI observations of GRB 050713A
  12. GRB 050713B
  13. GRB050713: Liverpool Telescope prompt observations
  14. GRB 050712, optical observations
  15. GRB050709: Candidate X-ray Afterglow from Chandra
  16. GRB 050713, R-band observations at NOT
  17. GRB 050713: ARC NIR Detections and Identification of Fading
  18. GRB 050713: Swift detection of Bright Burst
  19. GRB050709: Radio Observations
  20. GRB 050709: Swift UVOT and XRT observations
  21. GRB 050712: Swift detection of a weak burst
  22. GRB 050709: LCO40 Observations
  23. GRB050709, optical observations
  24. PROMPT Rc Observations of GRB 050709
  25. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  26. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  27. GRB 050626 optical observations
  28. GRB 050626: Swift XRT observations
  29. GRB 050701, optical observations
  30. GRB 050408: ARC 3.5-meter NIR Observations
  31. Swift UVOT observations of GRB 050701
  32. GRB 050607, radio observations
  33. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  34. GRB 050525A: Swift Late-Time Decay Rate
  35. GRB050525a: HST Observations
  36. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  37. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  38. XRF 050509c: Optical monitoring
  39. XRF050509c: Radio Detection
  40. GRB 050416(a): Host Galaxy Redshift Determination
  41. GRB 050607: RTT150 optical observations
  42. GRB050607: refined analysis of prompt REM observations
  43. Swift/UVOT observations of GRB050607
  44. GRB 050607 : Lulin R-band observation
  45. GRB 050607: PROMPT VRcIc Observations
  46. GRB 050607: RAPTOR-S Early Optical Limits
  47. GRB 050525a, Mid-Infrared Observations
  48. GRB 050607: Optical decay and spectral slope
  49. GRB 050607: MDM Observations
  50. GRB 050607 - XRT refined data analysis
  51. Optical Afterglow of GRB 050607
  52. GRB050607: Swift Detection of a long GRB
  53. GRB050607: P60 Observations
  54. GRB050607: prompt REM observations
  55. GRB 050603: prediction of t_break
  56. GRB 050603 - XRT data analysis of the first day
  57. GRB 050603: Analysis of UVOT data
  58. GRB050603: Fading Afterglow observed by Swift UVOT
  59. GRB050603, submillimetre observations
  60. GRB 050603: Swift XRT Position
  61. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  62. Swift/BAT Detection of GRB050603
  63. GRB 050408: jet break in the XRT light curve
  64. GRB 050525a, infrared observations
  65. GRB 050525a, SMARTS optical/IR afterglow observations
  66. GRB050528, XRT observations
  67. GRB050528: updated Liverpool Telescope limits
  68. Possible GRB050528: no candidate from Liverpool Telescope
  69. GRB050525a: Radio Observations
  70. GRB 050525: RTT150, Optical observations
  71. GRB 050525a: SARA Observations
  72. GRB 050525B: Swift-BAT observations
  73. GRB 050525a: MDM Observations
  74. GRB 050525 : Lulin optical afterglow observations
  75. GRB050525: Super-LOTIS observations
  76. GRB050306: optical afterglow not confirmed
  77. GRB 050525A: BOOTES simultaneous optical observations
  78. GRB050525: Optical observations
  79. GRB 050525: TAROT observations of the early afterglow
  80. GRB 050525, infrared observations
  81. GRB 050525: observatons of the optical afterglow
  82. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  83. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  84. XRF050522: NIR observations of XRT candidate
  85. XRF 050522: Swift XRT refined analysis
  86. XRF050522: Radio Observations
  87. XRF 050522: Continued NIR P200 Monitoring
  88. RBO Observations of GRB050522
  89. GRB050509b: optical observations
  90. GRB050520: Radio Observations
  91. XRF 050522: Swift XRT observation
  92. XRF050522, BVRcIc field photometry
  93. XRF 050522 : Lulin observations
  94. XRF050522: Optical Observations
  95. XRF050522: Near-infrared Observations
  96. XRF 050522: KAIT observations
  97. GRB 050520: VLT/ULTRACAM observations
  98. Swift UVOT Observations of GRB 050520
  99. XRF 050509c: Swift XRT Upper Limit
  100. XRF050509c: Radio Observations

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