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"

16141 results found.

  1. GRB 140423A: Mondy optical observations
  2. GRB 140508A: Continued RATIR Optical and NIR Observations
  3. GRB 140508A: ​HCT spectroscopy
  4. GRB 140508A: Swift/UVOT Detection
  5. GRB 140508A: RATIR Optical and NIR Observations
  6. GRB 140508A: Optical Observations via Virtual Telescope
  7. GRB 140508A: Swift-XRT observations
  8. GRB 140509A: Swift detection of a burst with an optical counterpart
  9. GRB 140508A: NOT photometry and spectroscopy
  10. GRB 140508A: SAO RAS and MASTER photometric and spectroscopic observations
  11. GRB 140508A: 1.23m CAHA BVRI-band observations
  12. GRB 140508A: iPTF optical transient candidate
  13. GRB 140430A: MITSuME Akeno upper limits
  14. GRB 140502A: ISON-NM early optical limit
  15. GRB 140506A: VLT/X-shooter spectroscopy
  16. GRB 140506A: Swift detection of a burst with an optical counterpart
  17. GRB 140430A: iTelescope.Net T16 Optical Observation
  18. GRB 140502A: MITSuME Okayama upper limits
  19. GRB 140430A: BVR-band IAC80 observations
  20. GRB 140430A: Further VATT Optical Observations
  21. GRB 140430A: VATT Optical Observations
  22. GRB 140430A: VLT/X-shooter redshift
  23. GRB 140430A: NOT optical observations
  24. GRB 140430A : Liverpool Telescope optical afterglow observations
  25. GRB140430A: Swift detection of a burst with an optical counterpart
  26. GRB 140428A: Swift/UVOT Upper Limits
  27. GRB 140423A: RTT150 optical observations
  28. Trigger 597570: Swift detection of SGR 1806-20
  29. GRB 140428A: 1.5m OSN I-band detection
  30. GRB 140428A: Keck detection of a red optical afterglow candidate
  31. GRB 140423A: MITSuME Akeno upper limits
  32. GRB 140423A Third epoch pODI photometry
  33. GRB 140423A: Continued RATIR Optical and NIR Observations
  34. GRB 140423A: MITSuME Akeno Optical observation
  35. DG CVn: optical observations
  36. GRB 140423A: RATIR Optical and NIR Observations
  37. GRB 140423A: NOT Afterglow Observations
  38. GRB 140419A: Continued Mondy optical observations
  39. GRB 140423A pODI/WIYN afterglow photometry
  40. GRB 140423A, Optical Observations
  41. GRB 140423A: Kanata/HONIR Optical and NIR Observations
  42. GRB 140423A: MITSuME Okayama Optical Observation
  43. GRB 140423A: KAIT Optical Detection
  44. GRB 140423A: Nanshan optical upper limit
  45. GRB 140423A: P60 Observations
  46. GRB 140423A: KWFC z-band photometry
  47. GRB 140419A, LOAO R-band observations
  48. GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143
  49. GRB 140423A: ROTSE-III Detection of Optical Counterpart
  50. GRB 140423A optical observations with pODI/WIYN at KPNO
  51. GRB 140423A: optical afterglow candidate
  52. GRB 140419A: Mondy optical observations
  53. GRB 140419A: Continued RATIR Optical and NIR Observations
  54. GRB140419A: NOT optical observations
  55. GRB 140419A: KAIT Refined Analysis
  56. GRB 140419A: Continued RATIR Optical and NIR Observations
  57. GRB 140419A, Optical Observations
  58. GRB 140419A: MITSuME Ishigakijima Optical Observation
  59. GRB 140419A: MITSuME Okayama Optical Observation
  60. GRB 140419A: Swift UVOT refined analysis
  61. GRB 140419A: P60 Observations
  62. GRB 140419A: T24 optical observations
  63. GRB 140419A: CARMA early 3mm detection
  64. GRB 140419A: RATIR Optical and NIR Observations
  65. GRB 140419A: ROTSE-III Detection of Optical Counterpart
  66. GRB 140419A (Swift trigger 596426) : KAIT optical candidate
  67. GRB 140419A: Swift detection of a burst with optical afterglow
  68. GRB 140414A: Swift/UVOT Upper Limit
  69. GRB 140414A: TNG optical observations
  70. GRB 140413A: Swift/UVOT Observations of the Optical Afterglow
  71. GRB 140413A: TAROT La Silla observatory optical observations
  72. GRB 140408A: 1.5m OSN optical upper limit
  73. GRB 140408A: MITSuME Akeno Optical observation
  74. Fermi418277210: iPTF optical observations
  75. GRB 140408A: RATIR Optical Upper Limits
  76. GRB 140408A: Swift/UVOT Upper Limits
  77. GRB 140408A: MITSuME Okayama upper limits
  78. GRB 140402A: Deep limit on the optical afterglow from Magellan observations
  79. GRB 140402A: Swift/UVOT Upper Limits
  80. GRB 140331A: Continued RATIR Optical and NIR Observations
  81. GRB 140402A: MASTER optical observations
  82. GRB 140301A: Zadko observatory - Gingin optical observations
  83. GRB 140331A: Swift/UVOT Upper Limits
  84. GRB 140302A: TAROT La Silla observatory optical observations
  85. GRB 140323A: Zadko observatory - Gingin optical observations
  86. GRB 140331A: Zadko observatory - Gingin optical observations
  87. GRB 140129B: AAO optical upper limit
  88. GRB 140129A: Mondy optical observations
  89. GRB 140331A: MITSuME Okayama upper limits
  90. GRB 140331A: RATIR Optical and NIR Observations
  91. GRB 140320D: MASTER optical observations
  92. GRB 140226A/iPTF14yb: Mondy optical observations
  93. GRB 140320C: Mondy optical observations and afterglow confirmation
  94. GRB 140323A: BOOTES-3 optical upper limit.
  95. GRB 140323A: Swift/UVOT Upper Limits
  96. GRB 140320A: RATIR Optical and NIR Observations
  97. GRB 140320C: Mini-GWAC prompt observation
  98. GRB 140320C: Swift/UVOT Upper Limits
  99. GRB 140320B: Swift/UVOT Upper Limits
  100. GRB 140320A: Swift/UVOT Upper Limits

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