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"

19260 results found.

  1. GRB 051008: Swift UVOT Candidate
  2. GRB 051006: P60 Observations
  3. GRB 051006: XRT refined analysis
  4. GRB 051006: optical observations at Sierra Nevada
  5. GRB051006: Refined analysis of the Swift-BAT burst
  6. GRB 050925: Second Epoch WSRT Radio Observations
  7. GRB 051001: I-band limit
  8. GRB 051001: Swift-BAT refined analysis
  9. GRB050925: Swift/XRT limits
  10. GRB/SGR 050925: IR Observations
  11. GRB 050922C: break in the lightcurve
  12. Refined analysis of the Swift-BAT soft short burst
  13. GRB050922C: TNG spectroscopic observations
  14. GRB050922B: refined XRT analysis
  15. GRB050922C: Optical Observations
  16. GRB 050922C: Swift XRT refined analysis
  17. HETE Fregate observations of GRB 050922C
  18. GRB 050922C: Swift-BAT refined analysis
  19. GRB 050922B: Swift-BAT refined analysis
  20. GRB 050922C: NOT optical observations
  21. GRB 050922C: Swift detection of a bright burst
  22. Possible GRB 050922 detected by INTEGRAL
  23. GRB050918: Possible Swift/XRT detected afterglow
  24. GRB050820B: analysis of the XMM-Newton observation
  25. GRB 050916: Swift-BAT refined analysis
  26. GRB050916 : Swift-XRT refined analysis
  27. GRB 050915B: Swift-BAT refined analysis
  28. GRB 050915a: IR Transient
  29. GRB 050915: Swift XRT refined analysis
  30. GRB 050915: Swift-BAT refined analysis
  31. GRB050911: Upper limit on X-ray afterglow
  32. Swift-BAT trigger 155072 ground analysis
  33. GRB 050908: DEIMOS spectrum and further analysis
  34. GRB 050911, optical content of Swift/XRT error box
  35. GRB 050911: Swift-BAT refined analysis
  36. GRB050911: Swift-BAT detection of a long burst
  37. GRB 050910a: TAROT early optical limits
  38. WIRO observations in I of GRB 050908
  39. GRB 050906: Possible X-ray Counterpart
  40. GRB050908 : Swift-XRT refined analysis
  41. GRB 050908: Swift-BAT refined analysis
  42. GRB 050908: Optical observations
  43. GRB 050908: Optical Observations
  44. GRB 050904 BAT refined analysis of complete data set
  45. GRB 050906: MARGE Optical Limits
  46. GRB 050906: Swift-BAT refined analysis
  47. GRB 050906: Swift XRT upper limit
  48. GRB 050906: Radio Observations
  49. GRB 050904: more VLT NIR observations
  50. GRB 050904: Afterglow Astrometry
  51. GRB 050904: NIR object inside the XRT error box
  52. GRB 050904: early Swift XRT analysis results
  53. GRB 050904: SOAR YJ and PROMPT Ic Observations
  54. GRB050904: Optical Observations
  55. GRB 050827 : OSN 1.5m optical observations
  56. GRB 050827: Optical Limit
  57. GRB 050827: XRT possible afterglow detection
  58. GRB 050826 : Lulin R band observation
  59. GRB 050827: Swift-BAT refined analysis
  60. GRB 050826: Optical Candidate
  61. GRB 050826: Swift XRT preliminary analysis results
  62. GRB 050826: BAT refined analysis
  63. GRB050824: MASTER final analysis of the OT observations
  64. Swift-BAT trigger 152038 is probably not a GRB
  65. GRB 050824: XRT refined analysis and possible afterglow detection
  66. GRB 050824: BAT refined analysis of a soft weak burst
  67. GRB050824: MASTER:OT decay
  68. GRB050824: MASTER observation OT
  69. GRB050805a: MASTER optical candidat
  70. GRB050820a: PROMPT RcIc Observations
  71. VLT/UVES spectroscopy of GRB050820
  72. GRB 050820A BAT observations of second, larger episode of emission
  73. GRB 050822: Swift-BAT refined analysis
  74. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  75. GRB 050820a: NIR Observations by WIRO
  76. GRB050820B: Refined analysis of the Swift-BAT burst
  77. GRB050820: refined XRT analysis
  78. GRB 050820 Swift-BAT refined analysis
  79. GRB 050820: P60 Temporal Decay Index
  80. GRB050819: refined XRT analysis
  81. GRB 050820: Swift detection of a GRB
  82. GRB050820: Optical afterglow from P60
  83. GRB 050819 Swift-BAT refined analysis
  84. GRB050817: Negative Optical Observations
  85. GRB050815: Optical afterglow detection by Swift UVOT
  86. GRB050815: XRT refined analysis
  87. GRB050815: Refined analysis of the Swift-BAT burst
  88. GRB 050814: XRT refined analysis
  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 050813: Magellan detection of a high redshift galaxy cluster
  93. GRB050813, SDSS pre-burst observations
  94. GRB 050813: Swift-BAT refined analysis
  95. GRB 050813: Photometry of object in XRT error circle
  96. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  97. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  98. Detection of an intermediate burst from SGR 1806-20 on August 8
  99. GRB 050730: WSRT Radio Observations
  100. GRB050805b: MASTER optical 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