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"

45813 results found.

  1. GRB 140629A: MITSuME Akeno Optical observation
  2. GRB 140629A: MASTER-Net preliminary light curve
  3. GRB 140629A: SAO RAS monitoring
  4. GRB 140629A: additional P60 observations
  5. Fermi 425667201: optical counterpart search
  6. GRB 140629A: Nishi-Harima NIR Observations
  7. Konus-Wind observation of GRB 140629A
  8. GRB 140629A: Swift/UVOT Detection
  9. GRB 140629A: TNG redshift confirmation
  10. GRB140629A: VATT optical observations
  11. GRB 140629A: P60 observations
  12. GRB 140629A: Swift-XRT refined Analysis
  13. GRB 140629A: BTA redshift
  14. GRB 140629A: MITSuME Ishigakijima Optical Observation
  15. GRB140629A: Kanata/HOWPol optical observation
  16. GRB 140629A: T100 observations
  17. GRB 140629A: NOT optical observations
  18. GRB 140629A: KWFC z-band photometry
  19. GRB 140629A : Virtual Telescope optical observations
  20. GRB 140629A: RTT150 optical observations
  21. GRB 140629A: Swift-BAT refined analysis
  22. GRB 140629A : Xinglong TNT optical observation
  23. GRB 140629A: Enhanced Swift-XRT position
  24. GRB 140629A: MASTER OT detection
  25. GRB 140629A: Swift detection of a burst with an optical counterpart
  26. GRB 140628A: GROND observation of the afterglow
  27. GRB 140628A: Swift-XRT refined Analysis
  28. GRB 140628A: Zadko observatory - Gingin optical observations
  29. GRB 140628A: Swift-BAT refined analysis
  30. GRB 140628A: Swift/UVOT Detection
  31. GRB 140628A: Swift/UVOT Detection
  32. GRB 140628A: Swift-XRT afterglow detection and enhanced position
  33. GRB 140626A: TAROT La Silla observatory optical observations
  34. GRB 140622A: TAROT La Silla observatory optical observations
  35. GRB 140628A: Swift detection of a burst
  36. GRB 140619B: Magellan near-infrared observations
  37. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  38. GRB 140623A: further Swift-XRT observations
  39. Swift Trigger 602668 is probably not an astrophysical source
  40. GRB 140626A: Swift-BAT refined analysis
  41. GRB 140626A: Swift-XRT refined Analysis
  42. GRB 140626A: Swift/UVOT Upper Limits
  43. GRB 140626A: Enhanced Swift-XRT position
  44. GRB 140626A: GROND Afterglow Candidate
  45. GRB 140619B: Suzaku WAM observation of the prompt emission
  46. GRB 140626A: Swift detection of a burst
  47. Further Swift/XRT observations of GRB140620A/iPTFcva
  48. GRB140606B/iPTF14bfu: Keck detection of an associated supernova
  49. GRB 140620A / iPTF14cva: TShAO optical observations
  50. GRB 140624A: Fermi GBM observation of a short burst
  51. GRB 140623A: Swift-XRT and UVOT observations
  52. GRB 140623A / iPTF14cyb: Fermi GBM detection
  53. GRB 140621A: Swift-XRT observations
  54. GRB 140622A: iTelescope.Net T11 Optical Observation
  55. GRB 140621A: Fermi GBM detection
  56. GRB 140622A: Swift/UVOT Upper Limits
  57. Konus-Wind observation of GRB 140621A
  58. IPN Triangulation of GRB 140621A
  59. Konus-Wind observation of GRB 140619A
  60. Fermi 425193729 / iPTF14cyb: Discovery of optical afterglow
  61. GRB 140622A: KAIT Optical Upper Limit
  62. GRB 140620A / iPTF14cva: Konkoly optical observations
  63. GRB 140622A: Swift-XRT refined Analysis
  64. GRB 140622A: An unusual short event, Swift-BAT refined analysis
  65. GRB 140622A: VLT/X-shooter redshift
  66. GRB 140622A: RATIR Optical and NIR Observations
  67. GRB 140622A: GROND Upper limits
  68. GRB 140622A: Enhanced Swift-XRT position
  69. GRB 140622A: Swift detection of a short burst
  70. GRB 140620A: Swift/UVOT Detection
  71. GRB 140606B / iPTF 14bfu: SAO RAS optical observations
  72. Correction to GCN 16429 (GRB 140619C)
  73. Konus-Wind observation of GRB 140619C
  74. GRB 140620A: Swift-XRT observations
  75. IPN Triangulation of GRB 140619C (long/very intense)
  76. GRB 140620A / iPTF14cva: Fermi GBM observations
  77. Fermi 424934131 / iPTF14cva: Discovery and Redshift of Optical Afterglow
  78. GRB 140619B: Swift-XRT observations
  79. GRB 140619A: Swift-BAT refined analysis
  80. GRB 140610A: TShAO optical upper limit
  81. GRB 140619B: Fermi-LAT Detection
  82. GRB 140619B: Fermi GBM detection of a short GRB
  83. GRB 140619A: Swift/UVOT Observations
  84. GRB 140619A: Swift-XRT refined Analysis
  85. GRB 140619A: Enhanced Swift-XRT position
  86. GRB 140619A: Swift detection of a burst with a possible optical counterpart
  87. Swift trigger 601928 is V490 Cep: BAT+XRT refined analysis.
  88. Swift-BAT trigger 601928: Detection of a possible outburst from V490 Cep
  89. GRB 140606B: Swift XRT final light curve
  90. GRB 140606A: BTA and OSN optical observations
  91. GRB 140614C: 1.23m CAHA (+EDIPO) observations
  92. GRB 140614B: MOSFIRE Ks-band nondetection
  93. GRB 140614C found in ground analysis of BAT data
  94. GRB 140614B: MITSuME Akeno upper limits
  95. GRB 140614B: Swift-XRT refined Analysis
  96. GRB 140614B: MITSuME Okayama upper limits
  97. GRB 140614B: Swift-BAT refined analysis
  98. GRB 140606B / iPTF 14bfu: Mondy optical observations
  99. GRB 140614A: Swift-BAT refined analysis
  100. GRB 140614A: X-shooter redshift

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