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"

39469 results found.

  1. GRB 140320B: P60 detection of a very red afterglow
  2. IPN Triangulation of very intense GRB 140320D
  3. GRB 140320C: Mini-GWAC prompt observation
  4. GRB 140320C: Swift/UVOT Upper Limits
  5. GRB 140320A: Swift-BAT refined analysis
  6. GRB 140320B: Swift/UVOT Upper Limits
  7. GRB 140320A: Swift/UVOT Upper Limits
  8. GRB 140320C: Swift-XRT observations
  9. GRB 140320A: Confirmation of a fading X-ray afterglow
  10. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  11. GRB 140320A: Fermi GBM detection
  12. GRB 140320B: Swift-XRT detection of the afterglow
  13. GRB 140320C: Mondy optical observations
  14. GRB 140320A: Enhanced Swift-XRT position
  15. GRB 140320A: Swift-XRT detection of an afterglow candidate
  16. GRB 140320C: MASTER optical observations
  17. GRB 140320C: FTN optical observations
  18. GRB 140320C: A long GRB detected by INTEGRAL
  19. GRB 140320B: Xinglong TNT upper limit
  20. GRB 140320B: ISON-NM optical observations
  21. GRB 140320B: A long GRB detected by INTEGRAL
  22. GRB 140320B: FTN optical afterglow candidate
  23. GRB 140320A: Fermi GBM observations suggest a short GRB
  24. GRB 140320A: Swift detection of a burst
  25. GRB 140318A: Continued RATIR Optical and NIR Observations
  26. GRB 140318A: Mondy optical limit
  27. GRB 140318A: Swift/UVOT Upper Limits
  28. GRB 140318A: Swift-BAT refined analysis
  29. GRB 140311B: Mondy optical limit
  30. GRB 140311A: Mondy optical limits
  31. GRB 140318A: Swift-XRT refined Analysis
  32. GRB 140318A: Liverpool Telescope optical observations
  33. GRB 140318A: Enhanced Swift-XRT position
  34. GRB 140318A: RATIR Optical and NIR Detections
  35. GRB140318A: Discovery Channel Telescope Optical Detection
  36. GRB 140318A: WHT spectroscopy
  37. GRB 140318A: NOT detection of the afterglow
  38. GRB 140318A: Swift detection of a burst
  39. GRB 140311A: VLA Detection
  40. GRB140308A: Suzaku WAM observation of the prompt emission
  41. GRB 140311C: MASTER optical observations
  42. GRB 140311C: Swift-XRT and UVOT observations
  43. GRB 140311C: MASTER before, during and after trigger optical observations
  44. GRB 140311A: further NOT observations
  45. GRB 140311B: Swift-BAT refined analysis
  46. GRB 140311A: RATIR Optical and NIR Detection
  47. GRB 140311C: Fermi GBM Detection
  48. GRB 140311A: Montarrenti Observatory optical upper limit
  49. GRB 140311B: Fermi GBM Detection
  50. GRB 140311A: Kottamia I-band observation
  51. GRB 140311A: Swift/UVOT Upper Limits
  52. GRB 140311B: Swift/UVOT Upper Limits
  53. GRB 140311B: RATIR Optical and NIR Observations
  54. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  55. GRB 140311A: Swift-XRT refined Analysis
  56. GRB 140311A: Gemini-North redshift
  57. GRB 140302A: GROND confirmation of the afterglow
  58. GRB 140311A: NOT redshift confirmation
  59. GRB 140311B: Swift-XRT refined Analysis
  60. GRB 140311A: Swift-BAT refined analysis
  61. GRB 140311A: Gemini-South redshift
  62. GRB 140311B: final MASTER OT light curve
  63. GRB 140311A: Enhanced Swift-XRT position
  64. GRB 140311B: Enhanced Swift-XRT position
  65. GRB 140311A: Recalibration of photometry of OT detected with Kottamia 188cm telescope
  66. GRB 140311A: Nanshan afterglow decay
  67. GRB 140311B: TAROT Calern observatory optical observations
  68. GRB 140311A: Optical follow-up observation with Kottamia 188cm telescope
  69. GRB 140311A: NOT observations of the optical afterglow
  70. GRB 140311A: Zadko observatory - Gingin optical observations
  71. GRB140311B: Swift/XRT position
  72. GRB 140311B: Swift-XRT observations
  73. GRB 140311B: Nanshan afterglow detection
  74. GRB 140311B: MASTER early optical observations
  75. GRB 140311A: Nanshan OT detection
  76. GRB 140311A: MASTER early optical observations
  77. GRB 140311B: Swift detection of a burst
  78. GRB 140311A: Swift detection of a probable burst
  79. Konus-Wind observation of GRB 140308A
  80. GRB 140304A: Suzaku WAM observation of the prompt emission
  81. IPN Triangulation of GRB 140308A
  82. GRB 140306A: Suzaku WAM observation of the prompt emission
  83. Konus-Wind observation of GRB 140306A
  84. IPN Triangulation of GRB 140306A
  85. GRB 140304A: Continued RATIR Optical and NIR Observations
  86. GRB 140304A: 10.4m GTC refined redshift z = 5.283
  87. GRB 140306A: Fermi GBM detection
  88. GRB 140305A: Swift-BAT refined analysis
  89. GRB 140304A: MASTER OT light curve
  90. GRB 140304A: CARMA 3mm detection
  91. GRB 140304A: VLA Detection
  92. GRB 140305A: Swift detection of a burst
  93. GRB 140304A: RATIR g-band Dropout
  94. GRB 140304A: Swift-BAT refined analysis
  95. GRB 140304A: Swift-XRT refined Analysis
  96. GRB 140304A: Enhanced Swift-XRT position
  97. GRB 140304A: Redshift from the NOT
  98. GRB 140304A: Fermi GBM detection
  99. GRB 140304A: 10.4m GTC redshift z = 5.39
  100. GRB 140304A: NOT observations and redshift estimate

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