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"

12170 results found.

  1. GRB 050904: early Swift XRT analysis results
  2. GRB 050827: P200 NIR Observations
  3. GRB050824, HETE-2 Observation
  4. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  5. GRB050824, I-band imaging
  6. GRB 050822: refined XRT analysis
  7. GRB 050824: XRT refined analysis and possible afterglow detection
  8. GRB 050824: ROTSE-III Optical Limits
  9. GRB050820A: RTT150 optical observations
  10. GRB 050822: Swift-BAT refined analysis
  11. GRB050820A: RTT150 optical observations
  12. GRB 050820a - corrections to GCN 3846
  13. GRB 050822: ROTSE-III Prompt Optical Limits
  14. GRB050820B: BAT-Swift detection of a bright GRB
  15. GRB 050820: High Resolution Spectroscopy from Keck
  16. GRB 050820: Swift detection of a GRB
  17. Swift-BAT trigger 150993 is not a GRB
  18. GRB 050815: ROTSE-III Optical Limits
  19. GRB050814: Fading red source
  20. GRB050814: P60 Optical Afterglow Candidate
  21. GRB 050814: XRT refined analysis
  22. GRB050814: Refined analysis of the Swift-BAT burst
  23. GRB 050814: Swift XRT Afterglow Localization
  24. GRB050813: RTT150 optical observations
  25. GRB 050813: KAIT optical limit
  26. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  27. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  28. Detection of an intermediate burst from SGR 1806-20 on August 8
  29. GRB 050807: ROTSE-III Optical Limits
  30. GRB050803, optical observations
  31. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  32. GRB 050803: RTT150 optical observations
  33. GRB050803: CrAO optical observations, possible OT candidate
  34. GRB 050803: Swift-BAT refined analysis
  35. GRB050803: MASTER further analys
  36. GRB 050803: early Swift XRT analysis results
  37. GCN GRB observation 050713A
  38. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  39. GRB050802: CrAO optical observations
  40. GRB 050802: Swift Gamma-ray Burst
  41. GRB 050801: Swift-BAT refined analysis
  42. GRB 050730, corrected photometry and break?
  43. GRB050730: Refined BAT analysis of the Swift-BAT burst
  44. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  45. GRB050730: Liverpool Telescope optical observations
  46. GRB 050730, optical candidate
  47. GRB050730: Swift-BAT detection of a weak burst
  48. GRB050713b: Maidanak optical observations
  49. GRB 050724: Chandra Observations of the X-ray Afterglow
  50. GRB 050724, SMARTS optical/IR afterglow observations
  51. GRB 050726, SMARTS optical/IR observations
  52. GRB 050724: J-band observations
  53. GRB 050724: SWIFT XRT refined position
  54. GRB050721A: Swift-BAT detection of a weak burst
  55. GRB 050712, Tautenburg optical afterglow observations
  56. Konus-Wind observation of GRB 050717
  57. Swift detection of GRB 050717
  58. Konus-Wind observation of GRB 050713A
  59. GRB 050714, R-band candidate
  60. GRB 050714A: ROTSE-III Optical Limits
  61. GRB 050714 - A long GRB detected with INTEGRAL
  62. GRB 050712, optical observations
  63. GRB050709: Candidate X-ray Afterglow from Chandra
  64. GRB 050713: Swift detection of Bright Burst
  65. GRB 050713A: ROTSE-III Optical Limits
  66. GRB050709: Radio Observations
  67. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  68. GRB 050626 optical observations
  69. GRB 050626: Swift XRT observations
  70. GRB 050408: ARC 3.5-meter NIR Observations
  71. GRB050701: Swift-BAT Refined analysis
  72. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  73. GRB 050626 - a long GRB detected with INTEGRAL
  74. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  75. Konus-Wind observation of an intermediate burst from SGR 1806-20
  76. GRB 050607: Optical decay and spectral slope
  77. Optical Afterglow of GRB 050607
  78. Konus-Wind observation of GRB 050603
  79. GRB050528: updated Liverpool Telescope limits
  80. GRB 050525: RTT150, Optical observations
  81. GRB 050525: MITSuME Optical Observation in VRI
  82. GRB050525: Super-LOTIS observations
  83. GRB 050525A: Swift-BAT refined analysis
  84. GRB050525: Optical observations
  85. Konus-Wind observation of GRB 050525
  86. INTEGRAL detection of GRB 050525
  87. GRB 050525, infrared observations
  88. GRB 050525: Optical observation
  89. GRB050525: ROTSE-III Refined Analysis
  90. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  91. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  92. XRF050522: NIR observations of XRT candidate
  93. XRF 050522: Swift XRT refined analysis
  94. GRB 050509A: Further I-band imaging
  95. GRB050522,optical observation
  96. GRB050520,optical observation
  97. GRB050509b: optical observations
  98. XRF 050522: Swift XRT observation
  99. XRF050522: Optical Observations
  100. XRF 050522 detected with INTEGRAL

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