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"

28301 results found.

  1. IPN Triangulation of GRB 130307A
  2. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  3. GRB 130310A: optical observations
  4. GRB 130306A: Swift Detection of a Possible Afterglow
  5. GRB 130131B: host detection and redshift
  6. GRB 130310A: Fermi-LAT detection and localization
  7. GRB 130306A: MITSuME Ishigakijima upper limits
  8. GRB 130306A: Swift-BAT refined analysis
  9. GRB 130305A BAT refined circular
  10. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  11. GRB 130305A: Gemini-North upper limit
  12. GRB 130307A: Fermi GBM detection
  13. GRB 130305A: Swift/UVOT Upper Limit
  14. GRB 130305A: RATIR Observations
  15. GRB 100615A: HST host detection and X-shooter redshift
  16. GRB 130305A: Swift/XRT detection of the afterglow
  17. GRB 130305A: Fermi GBM observation
  18. GRB 130305A: Fermi LAT Detection
  19. GRB 121128A: optical upper limit in Maidanak observatory
  20. GRB 130216A: Swift/UVOT Upper Limit
  21. GRB 130219A: Suzaku WAM observation of the prompt emission
  22. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  23. Trigger 549841: Swift detection of SGR1806-20
  24. GRB 130216B: Suzaku WAM observation of the prompt emission
  25. GRB 130216A: possible radio counterpart is steady field source
  26. IPN Triangulation of GRB 130219A
  27. GRB 130215A: Suzaku WAM observation of the prompt emission
  28. GRB 130215A: PTF P48 optical detection
  29. GRB 130219A: Fermi GBM detection
  30. GRB 130216A: Further Swift-BAT refined analysis
  31. GRB 130216B: MASTER-Net early observation
  32. GRB 130216A: MASTER-Net early observations
  33. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  34. GRB 130216A: Fermi GBM observation
  35. GRB 130216B: Fermi GBM observation
  36. GRB 130216A: MITSuME Ishigakijima upper limits
  37. GRB 130216B BAT refined analysis
  38. GRB 130216B: P200 NIR Observations
  39. GRB 130216A: P200 NIR Observations
  40. GRB 130216A: Swift-BAT refined analysis
  41. GRB 130216A: TAROT La Silla observatory optical observations
  42. GRB 130215A: Additional P200 NIR observations
  43. GRB 120118B: host observations and redshift determination
  44. GRB 130215A: P200 NIR observations
  45. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  46. GRB 130215A: MITSuME Okayama Optical Observation
  47. GRB 130215A: Fermi GBM detection
  48. GRB 130215A: RAPTOR Measurements
  49. GRB 130215A: GMG optical observation
  50. GRB 130215A: Xinglong optical observations
  51. GRB 130215A: Swift-BAT refined analysis
  52. GRB 130215A: TAROT La Silla observatory optical observations
  53. GRB 130215A: RATIR Optical and NIR Observations
  54. GRB 130215A: REM NIR observations
  55. GRB 130215A: P60 Observations
  56. GRB 130215A: Redshift estimate
  57. Skynet Observations of GRB130215
  58. GRB 130215: ROTSE-III Detection of Optical Counterpart
  59. GRB 130215A: Swift detection of a burst
  60. GRB 130131B: CTIO 0.9-m optical upper-limits
  61. GRB 121128A: optical observations
  62. GRB 121123A: optical observations
  63. GRB 130211A: Swift/UVOT Upper Limits
  64. GRB 130211A: Swift-XRT refined Analysis
  65. GRB 130211A: Swift-BAT refined analysis
  66. GRB 130211A: GROND detection of the afterglow
  67. GRB 130211A: Swift detection of a burst
  68. GRB 130206A: GROND Observations
  69. GRB 130206A: Fermi LAT Observations
  70. GRB 130206A: Fermi GBM observation
  71. GRB 130206A: XRT and UVOT follow-up observations.
  72. GRB 130131B: optical upper limit in Mondy observatory
  73. GRB 130206A, Swift-BAT refined analysis
  74. GRB 130206A: Zadko observatory - Gingin optical observations
  75. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  76. GRB 130206A: Swift-XRT observations
  77. GRB 130131A: optical observation in Mondy observatory
  78. GRB 130131A: Swift/UVOT Upper Limits
  79. GRB 130131B: RATIR Upper Limits
  80. GRB 130131A: RATIR optical and infrared upper limits
  81. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  82. GRB 130131B: Swift-XRT refined Analysis
  83. GRB 130131A - UKIRT confirmation of afterglow
  84. GRB 130131B: VLT/X-shooter acquisition camera limits
  85. GRB 130131B: GROND Upper limits
  86. GRB 130131B: Swift/UVOT Upper Limits
  87. GRB 130131A: Swift-XRT refined Analysis
  88. GRB 130131B: MITSuME Okayama optical upper limits
  89. GRB 130131A: MITSuME Okayama optical upper limits
  90. GRB 130131B: Enhanced Swift-XRT position
  91. GRB 130131B: Swift-BAT refined analysis
  92. GRB 130131A: Swift-BAT refined analysis
  93. GRB 130131B: TAROT Calern observatory optical observations
  94. GRB 130131B: Zadko observatory - Gingin optical observations
  95. GRB 130131A: Enhanced Swift-XRT position
  96. GRB 130131B: Swift detection of a burst
  97. GRB 130131A - Faulkes Telescope North Observations
  98. GRB 130131A - UKIRT afterglow candidate
  99. GRB 130131A: Swift detection of a burst
  100. GRB 130127A: Fermi GBM detection

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