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"

39363 results found.

  1. GRB050713B :Swift/UVOT observations
  2. GRB050712: TNG R-band observations
  3. GRB 050713B: Swift-BAT Refined Analysis
  4. Swift-BAT Trigger 145729 is not a GRB
  5. GRB 050713A: Swift/UVOT observation
  6. GRB 050713A : Swift-BAT Refined Analysis
  7. GRB 050713A : Lulin R-band observation
  8. GRB 050713A XMM-Newton 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. GRB050709 : Chandra source optical counterpart
  14. GRB050713: Liverpool Telescope prompt observations
  15. GRB 050712, optical observations
  16. GRB 050713 : Planned XMM-Newton observation
  17. GRB050709: Candidate X-ray Afterglow from Chandra
  18. GRB 050713, R-band observations at NOT
  19. GRB 050713: ARC NIR Detections and Identification of Fading
  20. GRB050713: possible I-band afterglow
  21. GRB 050713: Swift detection of Bright Burst
  22. GRB 050713A: ROTSE-III Optical Limits
  23. GRB 050709: Swift UVOT and XRT observations
  24. GRB 050712: Swift-BAT Refined Analysis
  25. GRB 050712: Swift XRT afterglow position
  26. GRB 050712: Swift detection of a weak burst
  27. GRB 050709: LCO40 Observations
  28. GRB050709: A Possible Short-Hard GRB Localized by HETE
  29. PROMPT Rc Observations of GRB 050709
  30. GRB 050525a: PROMPT VRcIc Detections
  31. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  32. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  33. GRB 050626 optical observations
  34. GRB 050626: Swift XRT observations
  35. GRB 050701
  36. GRB 050701, optical observations
  37. GRB 050408: ARC 3.5-meter NIR Observations
  38. GRB 050701: Refined XRT analysis
  39. Swift UVOT observations of GRB 050701
  40. GRB 050701: Swift XRT afterglow position
  41. Swift trigger 143708 is really GRB 050701
  42. GRB 050607, radio observations
  43. GRB 050626 - Correction to GCN 3552
  44. GRB 050626 - a long GRB detected with INTEGRAL
  45. GRB 050525A: Swift Late-Time Decay Rate
  46. H3804: A Possible New XRB Detected by HETE
  47. XRF 050509c: Optical monitoring
  48. IBAS Alert #2512 is NOT a GRB
  49. GRB 050416(a): Host Galaxy Redshift Determination
  50. GRB 050607: MDM Observation
  51. GRB 050607 optical decay
  52. GRB 050607: RTT150 optical observations
  53. GRB 050607 : Lulin R-band observation
  54. GRB 050607: PROMPT VRcIc Observations
  55. GRB 050607: RAPTOR-S Early Optical Limits
  56. GRB 050525a, Mid-Infrared Observations
  57. GRB 050607: Optical decay and spectral slope
  58. GRB 050607: MDM Observations
  59. GRB050607,optical observation
  60. GRB 050607 - XRT refined data analysis
  61. Optical Afterglow of GRB 050607
  62. GRB050607 optical limit by "Pi of the Sky"
  63. GRB050607: Swift Detection of a long GRB
  64. GRB050607: P60 Observations
  65. GRB050607: prompt REM observations
  66. GRB 050603: prediction of t_break
  67. Limits on a SN in the field of GRB 050509b
  68. GRB 050603: Redshift
  69. GRB 050603 - XRT data analysis of the first day
  70. Konus-Wind observation of GRB 050603
  71. GRB 050603: Analysis of UVOT data
  72. GRB 050603: Swift XRT Position
  73. GRB050603: Radio Detection
  74. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  75. GRB 050603: Afterglow Identification from LCO
  76. GRB 050603: INTEGRAL shows it is not a short GRB
  77. Swift/BAT Detection of GRB050603
  78. GRB 050408: jet break in the XRT light curve
  79. GRB 050525a, infrared observations
  80. GRB 050525a, SMARTS optical/IR afterglow observations
  81. GRB050528, XRT observations
  82. Correction to GCN Circ 3502 on GRB 050528
  83. GRB050528: updated Liverpool Telescope limits
  84. Swift-BAT GRB 050528: a soft burst
  85. Update on Swift-BAT GRB 050528 (Trigger 130679)
  86. GRB050528: BOOTES optical candidate (retraction)
  87. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  88. GRB050528: BOOTES optical candidate
  89. Possible GRB050528: no candidate from Liverpool Telescope
  90. Swift-BAT detection of possible GRB 050528
  91. GRB050525a: Radio Observations
  92. GRB 050509b: refined XRT/Chandra afterglow position analysis
  93. GRB 050525: RTT150, Optical observations
  94. GRB050525a: optical upper limits
  95. GRB 050525a: SARA Observations
  96. GRB 050525B: Swift-BAT observations
  97. GRB 050525: MITSuME Optical Observation in VRI
  98. GRB 050525a: MDM Observations
  99. GRB050525A,optical observation
  100. GRB 050525 : Lulin optical afterglow 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