Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

36380 results found.

  1. GRB 051227: R-band object in the XRT error circle
  2. GRB 051227: Joint Swift-HETE Spectral Analysis
  3. GRB 051227: XRT refined analysis
  4. GRB 051227: Further analysis of the Swift-BAT burst
  5. GRB 051227: Refined analysis of the Swift-BAT burst
  6. GRB051227: SDSS pre-burst observations
  7. GRB 051227, optical observation
  8. GRB 051227: Swift detection of a burst
  9. IBAS_alert n. 2719 : not a real GRB
  10. Konus-Wind observation of GRB 051221A
  11. GRB051221A: Suzaku WAM observation of the prompt emission
  12. GRB 051221A: MDM Optical Observations
  13. GRB051016: analysis of the XMM-Newton observation
  14. GRB 051221A: Detection at 251nm with Swift UVOT
  15. GRB 051221A: Chandra Afterglow Position
  16. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  17. GRB 051221B: ROTSE-III Optical Limits
  18. GRB 051221B: TAROT optical limits
  19. GRB 051221A: WSRT Radio Observations
  20. GRB 051221: Redshift from Gemini
  21. GRB 051221: Continued fading of optical afterglow
  22. GRB 051221B: Refined analysis of the Swift-BAT burst
  23. Possible GRB 051221B: MDM Optical Detection
  24. GRB 051221A: RAPTOR Fading Counterpart Constraint
  25. GRB 051221B: BOOTES optical observations.
  26. Possible GRB 051221B: Swift XRT position
  27. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  28. Swift-BAT detection of a possible burst
  29. GRB 051221: Discovery of fading optical afterglow
  30. GRB 051221: Swift XRT refined analysis
  31. GRB 051221: Swift/UVOT upper limits
  32. GRB 051221: Possible nearby cluster
  33. GRB 051221: No variability in Gemini data
  34. GRB 051221: Correction to GCN #4368
  35. GRB 051221: Gemini observations
  36. GRB 051221: Improved astrometry of the IR counterpart
  37. GRB051221: K-band source
  38. GRB 051221: XRT position
  39. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  40. GRB 051221: IR Observations at GRB+1hr
  41. GRB 051221: Swift detection of a bright short burst
  42. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  43. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  44. GRB 051211B: optical afterglow
  45. Swift detection of an RS CVn flare star
  46. GRB051211A: possible optical candidate
  47. Swift Trigger 172767 is not a GRB
  48. GRB 051215: near-infrared observations
  49. GRB051215 - SDSS pre-burst observations
  50. GRB 051215: Swift detection of a possible burst
  51. GRB 051215: A short GRB in a cluster?
  52. GRB051105: optical observations
  53. GRB 051213: Swift-BAT refined analysis
  54. GRB 051211B, optical observation
  55. GRB 051213: Swift-BAT detection of a burst
  56. GRB 051211a: RTT150 optical observations
  57. GRB051211B, RBO optical observations
  58. GRB 051211A: Swift/UVOT upper limits
  59. GRB 051211B: Swift/UVOT upper limits - correction
  60. GRB 051211B: Swift/UVOT upper limits
  61. GRB 051211A,optical observation
  62. GRB 051211B: Swift XRT confirmation of the afterglow
  63. GRB051211B: Liverpool Telescope observation
  64. GRB 051211b: RTT150 optical observations
  65. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  66. GRB 051211B: Swift XRT Observations
  67. GRB 051210: Swift/UVOT upper limits
  68. GRB 051210: Magellan Imaging
  69. GRB 051211: TAROT optical limits
  70. GRB 051211B: a possible optical detection by TAROT
  71. GRB 051211B: a long GRB detected by INTEGRAL
  72. GRB 051211: Swift XRT upper limit
  73. GRB 051211:IAC80 optical observations
  74. HETE SXC localization of GRB 051211 (=H3979)
  75. GRB 051210: Optical imaging from Las Campanas
  76. GRB 051210: SALT detection limit
  77. GRB 051210: BAT further refined analysis of the short burst
  78. GRB 051210: Swift XRT refined analysis
  79. GRB 051210: FRAM early limit
  80. GRB 051210: Swift-BAT refined analysis of a short burst
  81. GRB 051210: A short GRB in a cluster?
  82. GRB 051210: Swift detection of a burst
  83. IPN observations of SGR1806-20
  84. An extraordinary long burst on December 3 from SGR1806-20
  85. IBAS Alert 2706 : not a real GRB
  86. GRB051117B: optical observation
  87. GRB051111: optical observaion
  88. Swift-BAT trigger 165579 is not a GRB
  89. GRB 051127: Swift-BAT detection of a possible burst
  90. GRB051117b: No Swift/UVOT Detection
  91. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  92. GRB 051117A: Swift/UVOT Detection of an Afterglow
  93. GRB051111: Suzaku WAM observation of the prompt emission
  94. GRB051008: Suzaku WAM observation of the prompt emission
  95. GRB 051109B: GAO 150cm telescope Optical limit
  96. GRB 051109A : GAO 150cm telescope Rc-band detection
  97. GRB 051021 Optical Observations
  98. GRB 051117B: MARGE Optical Limits
  99. GRB 051117A and B: Radio Observations
  100. GRB 051117B: R and I observations of possible host galaxy

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