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"

36178 results found.

  1. GRB080207: RTT150 Optical Observations
  2. GRB 080207: REM NIR observations
  3. GRB 080207: TAROT Calern observatory optical observations
  4. GRB 080207: Swift-XRT Refined Analysis
  5. GRB 080207: Enhanced Swift-XRT position
  6. GRB 080207: Swift detection of a burst
  7. Konus-Wind observation of GRB 080204
  8. GRB 080205 optical upper limit
  9. GRB 080205: MASTER optical observation
  10. GRB 080205: optical observation
  11. VLA radio upper limit on GRB 080205
  12. INT+WFC R-band observations of GRB 080205
  13. GRB 080205, Swift-BAT refined analysis
  14. IPN localization of very hard GRB 080204
  15. GRB 080205: Swift XRT refined analysis
  16. GRB 080205: OA evolution from KAIT observations
  17. GRB 080205: Swift/UVOT observations
  18. GRB 080205: Enhanced Swift-XRT position
  19. GRB 080205: KAIT OA detection
  20. GRB 080205: Swift detection of a burst
  21. GRB 080130: Swift-BAT refined analysis
  22. GRB 080130: further Swift XRT observations confirm fading source
  23. GRB 080129: Swift/UVOT Refined Upper Limits
  24. GRB 080130: REM NIR observations
  25. GRB 080130(?): Swift XRT observation
  26. GRB 080130?: Detection of a possible burst by BATSS
  27. GRB 080129: Optical observations from OSN
  28. GRB 080129: Swift-XRT refined analysis
  29. GRB 080129: KAIT optical limits
  30. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  31. GRB 080129: optical limit by Pi of the Sky
  32. GRB 080129, Swift-BAT refined analysis
  33. GRB 080129: TAROT La Silla observatory optical observations
  34. GRB 080129: Gemini-South photometry
  35. GRB 080129: GROND detection in all bands, and fading
  36. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  37. GRB 080129: Enhanced Swift-XRT position
  38. GRB 080129: Gemini-South Imaging Observations
  39. GRB 080129: Swift XRT position
  40. GRB 080129 (?): UVOT Upper Limits
  41. GRB 080129 (?): Swift detection of a possible burst
  42. A new website of high-level data products for Swift GRBs
  43. GRB 080121: Upper limit on X-ray afterglow
  44. GRB 080123 : Suzaku WAM observation of the prompt emission
  45. Swift trigger(=301779) is not a GRB
  46. GRB 080122: pseudo-z= 1.93 from prompt emission spectrum
  47. Konus-Wind observation of GRB 080122
  48. GRB 080122 : Suzaku WAM observation of the prompt emission
  49. GRB 080121: Swift/UVOT upper limits
  50. SNe 2008D and 2007uy: Chandra Detections
  51. GRB 080121 position was incorrect
  52. GRB 080121: Enhanced Swift-XRT position
  53. IPN triangulation of GRB080122
  54. GRB 080121: Nearby SDSS galaxies
  55. GRB 080121: Swift-BAT detection of a very weak, short burst
  56. GRB 080123: Swift-XRT refined analysis
  57. GRB 080123: Swift/UVOT refined analysis
  58. X-ray transient in NGC 2770: RTT150 optical observations
  59. GRB 080123, Swift-BAT refined analysis
  60. GRB 080123: Enhanced Swift-XRT position
  61. GRB 080123: Swift detection of a short burst
  62. GRB 080120: GROND confirmation of the optical afterglow
  63. VLA radio upper limit on GRB 080120
  64. GRB 080120: Swift-XRT refined analysis
  65. GRB 080120: GROND detection
  66. GRB 080120 : Planned XMM-Newton observation
  67. GRB080120: Swift XRT position
  68. GRB 080120: a long GRB detected by INTEGRAL
  69. XRF 080109 / SN 2008D: spectroscopic evolution
  70. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  71. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  72. XRF 080109 in NGC2770: Detectable Superluminal Motion
  73. Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
  74. Transient in NGC 2770: spectroscopic evidence for a SN
  75. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  76. GRB 071227: Suzaku WAM observation of the prompt emission
  77. GRB 071227: optical afterglow
  78. Further Swift-BAT analysis of GRB 071227
  79. Konus-Wind observation of GRB 071227
  80. GRB 071227: Magellan redshift confirmation
  81. GRB 071227: Swift-XRT refined analysis
  82. GRB 071227: VLT probable redshift of the candidate host galaxy
  83. GRB 071227: Magellan observations
  84. GRB 071227: REM NIR and Optical observations
  85. Swift-BAT refined analysis of short GRB 071227
  86. GRB 071227: Swift detection of a burst
  87. GRB071020: optical observations
  88. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  89. Swift-BAT trigger 298308 is not a GRB
  90. GRB 071208?: Swift detection of a possible burst
  91. IBAS Alert #4772 in not a GRB
  92. GRB 071125: Suzaku WAM observation of the prompt emission
  93. GRB 070429B: Probable host galaxy and redshift
  94. GRB 071129, Swift-BAT refined analysis
  95. GRB 071129: Swift detection of a burst
  96. Konus-Wind and Konus-A observations of GRB 071125
  97. IPN triangulation of very bright GRB 071125
  98. GRB 071112C: Optical/NIR observations
  99. Disregard the "GRB 071126" position
  100. GRB 071126: Enhanced Swift-XRT position

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