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"

45760 results found.

  1. GRB 140709B: Fermi GBM detection
  2. GRB 140709B: Swift-BAT refined analysis
  3. GRB 140709A : Virtual Telescope optical observations
  4. GRB 140709B: Khureltogot optical upper limit
  5. GRB 140709B: OSN optical limit
  6. GRB 140709B: Enhanced Swift-XRT position
  7. GRB 140709A: Fermi GBM detection
  8. GRB 140709A: BOOTES-2 and OSN optical observations
  9. GRB 140709A, Swift-BAT refined analysis
  10. GRB 140709B: MASTER optical observation
  11. GRB 140709B: Swift detection of a burst
  12. GRB 140709A: Swift-XRT refined Analysis
  13. GRB 140709A: Swift/UVOT Upper Limits
  14. GRB 140709A - UVOT-enhanced XRT position
  15. GRB 140709A: RATIR Optical and NIR Observations
  16. GRB 140709A: Swift detection of a burst
  17. Fermi GBM trigger 140708682 is not a GRB
  18. GRB 140705A: Nishi-Harima NIR upper limits
  19. GRB 140703A: AMI 15 GHz detection
  20. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  21. GRB 140706A: Swift/UVOT Detection
  22. GRB 140703A: Swift/UVOT Upper Limits
  23. GRB 140706A: Swift-BAT refined analysis
  24. GRB 140706A: Swift-XRT refined Analysis
  25. GRB 140706A: Fermi GBM detection
  26. GRB 140703A: AAO optical observations
  27. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  28. GRB140706A: GROND detection of the Optical/NIR afterglow
  29. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  30. GRB 140706A: Enhanced Swift-XRT position
  31. GRB 140706A: Swift detection of a burst with an optical counterpart
  32. SGR 1935+2154: Swift-BAT observations of additional short soft events
  33. GRB 140705A / SGR 1935+2154: FTN observations
  34. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  35. GRB 140705A: KAIT Optical Upper Limit
  36. GRB 140705A: MITSuME Ishigakijima upper limits
  37. GRB 140705A: Swift-XRT refined Analysis
  38. GRB 140705A: MITSuME Okayama upper limits
  39. GRB 140705A: Swift/UVOT Upper Limits
  40. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  41. GRB 140705A: Enhanced Swift-XRT position
  42. GRB 140705A: Swift detection of a short burst
  43. GRB 140621A: Suzaku WAM observation of the prompt emission
  44. GRB 140629A: SAO RAS Rc band photometry
  45. GRB 140629A, Optical observations
  46. GRB 140703A: VLA K-band detection
  47. GRB 140703A: CARMA 3mm detection
  48. GRB 140703A: P60 observations of a red, slowly-fading afterglow
  49. GRB 140703A: RATIR Optical and NIR Observations
  50. GRB 140703A: Fermi GBM detection
  51. GRB 140703A: Monte Agliale Observatory optical observations
  52. GRB 140703A: Swift-XRT refined Analysis
  53. GRB 140703A: Swift-BAT refined analysis
  54. Correction to GCN 16507: GRB 140703A!
  55. GRB 140703A: MASTER optical observations
  56. GRB 140703A: Enhanced Swift-XRT position
  57. GRB140703A: 10.4m GTC redshift
  58. GRB 140703A: BOOTES-2 and OSN optical observations
  59. GRB 140703A: Swift detection of a burst
  60. GRB 140619C: Suzaku WAM observation of the prompt emission
  61. GRB 140629A: MITSuME Akeno Optical observation
  62. GRB 140629A: MASTER-Net preliminary light curve
  63. GRB 140629A: SAO RAS monitoring
  64. GRB 140629A: additional P60 observations
  65. Fermi 425667201: optical counterpart search
  66. GRB 140629A: Nishi-Harima NIR Observations
  67. Konus-Wind observation of GRB 140629A
  68. GRB 140629A: Swift/UVOT Detection
  69. GRB 140629A: TNG redshift confirmation
  70. GRB140629A: VATT optical observations
  71. GRB 140629A: P60 observations
  72. GRB 140629A: Swift-XRT refined Analysis
  73. GRB 140629A: BTA redshift
  74. GRB 140629A: MITSuME Ishigakijima Optical Observation
  75. GRB140629A: Kanata/HOWPol optical observation
  76. GRB 140629A: T100 observations
  77. GRB 140629A: NOT optical observations
  78. GRB 140629A: KWFC z-band photometry
  79. GRB 140629A : Virtual Telescope optical observations
  80. GRB 140629A: RTT150 optical observations
  81. GRB 140629A: Swift-BAT refined analysis
  82. GRB 140629A : Xinglong TNT optical observation
  83. GRB 140629A: Enhanced Swift-XRT position
  84. GRB 140629A: MASTER OT detection
  85. GRB 140629A: Swift detection of a burst with an optical counterpart
  86. GRB 140628A: GROND observation of the afterglow
  87. GRB 140628A: Swift-XRT refined Analysis
  88. GRB 140628A: Zadko observatory - Gingin optical observations
  89. GRB 140628A: Swift-BAT refined analysis
  90. GRB 140628A: Swift/UVOT Detection
  91. GRB 140628A: Swift/UVOT Detection
  92. GRB 140628A: Swift-XRT afterglow detection and enhanced position
  93. GRB 140626A: TAROT La Silla observatory optical observations
  94. GRB 140622A: TAROT La Silla observatory optical observations
  95. GRB 140628A: Swift detection of a burst
  96. GRB 140619B: Magellan near-infrared observations
  97. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  98. GRB 140623A: further Swift-XRT observations
  99. Swift Trigger 602668 is probably not an astrophysical source
  100. GRB 140626A: Swift-BAT refined analysis

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