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"

28100 results found.

  1. Swift-BAT trigger 155072 ground analysis
  2. Swift-BAT trigger 155072 is probably not a GRB
  3. GRB 050908: DEIMOS spectrum and further analysis
  4. GRB 050911, optical content of Swift/XRT error box
  5. GRB 050911: Swift-BAT refined analysis
  6. GRB 050911: z~0.16 cluster in the field
  7. GRB050911: Swift-BAT detection of a long burst
  8. GRB 050910a: TAROT early optical limits
  9. WIRO observations in I of GRB 050908
  10. GRB 050906: Possible X-ray Counterpart
  11. GRB050908: Swift/UVOT Early upper limits
  12. GRB050908 : Swift-XRT refined analysis
  13. GRB 050908: Swift-BAT refined analysis
  14. GRB 050908: Optical observations
  15. GRB 050908: Optical Observations
  16. GRB 050908: Swift detection of a burst
  17. GRB 050906: Optical observations at the Very Large Telescope
  18. GRB 050904 BAT refined analysis of complete data set
  19. GRB 050904: Subaru Optical Spectroscopy
  20. GRB 050906: MARGE Optical Limits
  21. GRB 050906: Swift-BAT refined analysis
  22. GRB 050906: Swift XRT upper limit
  23. GRB 050906: Radio Observations
  24. GRB 050904: Keck I-band Imaging
  25. GRB050906: P60 Observations
  26. GRB 050904: more VLT NIR observations
  27. GRB 050904: photometric redshift
  28. GRB 050904: Swift/UVOT observations
  29. GRB 050904: NIR object inside the XRT error box
  30. GRB 050904: early Swift XRT analysis results
  31. GRB 050904: SOAR YJ and PROMPT Ic Observations
  32. GRB050904: Optical Observations
  33. GRB050904: P60 Observations
  34. GRB 050904: TAROT optical limits
  35. GRB 050827 : OSN 1.5m optical observations
  36. GRB 050827: P200 NIR Observations
  37. GRB050827: Swift/UVOT upper limits
  38. GRB 050827: Optical Limit
  39. GRB 050827: XRT possible afterglow detection
  40. GRB 050826 : Lulin R band observation
  41. GRB050824: Maidanak optical limits
  42. GRB 050827: Swift-BAT refined analysis
  43. Subaru Observations of GRB050724
  44. GRB 050826: Optical Candidate
  45. GRB 050826: Swift XRT preliminary analysis results
  46. GRB 050826: BAT refined analysis
  47. GRB050826: Swift/UVOT early upper limits
  48. GRB050826: Swift-BAT detection of a long burst
  49. GRB050824: MASTER final analysis of the OT observations
  50. Swift-BAT trigger 152038 is probably not a GRB
  51. GRB 050824: XRT refined analysis and possible afterglow detection
  52. GRB 050824: BAT refined analysis of a soft weak burst
  53. GRB050824: MASTER:OT decay
  54. GRB050824: MASTER observation OT
  55. GRB050805a: MASTER optical candidat
  56. XRF050509c: Radio upper limits from GMRT
  57. GRB050822: Swift/UVOT upper limits
  58. GRB 050820A BAT observations of second, larger episode of emission
  59. GRB050813: Maidanak I-band observations
  60. GRB 050822: Swift-BAT refined analysis
  61. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  62. GRB050820B at FRAM
  63. Swift/UVOT UV Photometry of GRB 050820B
  64. GRB 050822: Swift detection of a long burst
  65. GRB050820a BVRcIc field photometry
  66. GRB050820B XMM-Newton observation
  67. GRB 050820a: NIR Observations by WIRO
  68. GRB 050820B: Swift XRT position
  69. GRB050820B: Refined analysis of the Swift-BAT burst
  70. GRB050820: refined XRT analysis
  71. GRB 050820 Swift-BAT refined analysis
  72. GRB050819: refined XRT analysis
  73. GRB 050820: Swift detection of a GRB
  74. GRB 050819 Swift-BAT refined analysis
  75. GRB050819: Swift-BAT detection of a weak burst
  76. GRB 050817: Optical observations
  77. GRB050817: Negative Optical Observations
  78. GRB 050814: continued fading
  79. GRB050815: Optical afterglow detection by Swift UVOT
  80. GRB050815: XRT refined analysis
  81. GRB050815: Refined analysis of the Swift-BAT burst
  82. GRB 050815: ROTSE-III Optical Limits
  83. GRB050815: Swift-BAT detection of a burst
  84. GRB050814: Fading red source
  85. GRB050814: P60 Optical Afterglow Candidate
  86. GRB 050813: Non-fading of afterglow candidate
  87. GRB 050814: XRT refined analysis
  88. GRB050814: SWIFT/UVOT observation
  89. GRB050814: Refined analysis of the Swift-BAT burst
  90. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  91. GRB 050814: Swift XRT Afterglow Localization
  92. GRB 050814: Swift detection of a burst
  93. GRB 050813: Magellan detection of a high redshift galaxy cluster
  94. GRB050813, SDSS pre-burst observations
  95. GRB 050813: Swift-BAT refined analysis
  96. GRB 050813: Photometry of object in XRT error circle
  97. GRB050813: SWIFT/UVOT observation
  98. GRB 050813: Swift XRT afterglow localization
  99. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  100. Detection of an intermediate burst from SGR 1806-20 on August 8

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