Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

28084 results found.

  1. GRB 140413A: GROND afterglow candidate
  2. GRB 140412A: Swift detection of a burst
  3. GRB 140408A: 1.5m OSN optical upper limit
  4. Swift Trigger 595345 is not an astrophysical source
  5. Swift-BAT trigger 595162 is noise
  6. GRB 140408A: MITSuME Akeno Optical observation
  7. Fermi418277210: iPTF optical observations
  8. GRB 140408A: RATIR Optical Upper Limits
  9. GRB 140408A: Swift-BAT refined analysis
  10. GRB 140408A: GROND Detection of an Afterglow Candidate
  11. GRB 140408A: Swift/UVOT Upper Limits
  12. GRB 140408A: Swift-XRT refined Analysis
  13. GRB 140408A: MITSuME Okayama upper limits
  14. GRB 140408A: Enhanced Swift-XRT position
  15. GRB 140408A: Swift detection of a burst
  16. GRB 140406A: Fermi GBM observation
  17. GRB 140402A: Deep limit on the optical afterglow from Magellan observations
  18. GRB 140331A: Continued RATIR Optical and NIR Observations
  19. GRB 140402A: Swift-XRT observations
  20. GRB 140402A: Marginal BAT detection
  21. Swift trigger 594286: Is likely a noise trigger
  22. GRB 140330A: Fermi GBM observation
  23. GRB 140331A: Swift-XRT refined Analysis
  24. GRB 140301A: Zadko observatory - Gingin optical observations
  25. GRB 140331A: Swift-BAT refined analysis
  26. GRB 140331A: Swift/UVOT Upper Limits
  27. GRB 140302A: TAROT La Silla observatory optical observations
  28. GRB 140323A: Zadko observatory - Gingin optical observations
  29. GRB 140330A: intense and persistent gamma-ray emission detected by AGILE
  30. GRB 140331A: Zadko observatory - Gingin optical observations
  31. GRB 140129B: AAO optical upper limit
  32. GRB 140129A: Mondy optical observations
  33. GRB 140331A: MITSuME Okayama upper limits
  34. GRB 140331A: Enhanced Swift-XRT position
  35. GRB 140331A: RATIR Optical and NIR Observations
  36. GRB 140331A: Swift detection of a burst
  37. GRB 140330A: Fermi-LAT Detection
  38. GRB 140329A: Fermi-LAT detection
  39. GRB 140329A: Fermi GBM observation of a bright burst
  40. GRB 140320D: Suzaku WAM observation of the prompt emission
  41. GRB 140323A : Suzaku WAM observation of the prompt emission
  42. GRB 140226A/iPTF14yb: Mondy optical observations
  43. GRB 140320C: Mondy optical observations and afterglow confirmation
  44. GRB 140323A: Fermi-LAT detection
  45. GRB 140323A: Swift-XRT refined Analysis
  46. GRB 140323A: Swift/UVOT Upper Limits
  47. GRB 140323A: Swift-BAT refined analysis
  48. GRB 140323A: Enhanced Swift-XRT position
  49. GRB 140323A: Swift detection of a burst
  50. GRB 140320A: RATIR Optical and NIR Observations
  51. IPN Triangulation of very intense GRB 140320D
  52. GRB 140320C: Mini-GWAC prompt observation
  53. GRB 140320C: Swift/UVOT Upper Limits
  54. GRB 140320A: Swift-BAT refined analysis
  55. GRB 140320B: Swift/UVOT Upper Limits
  56. GRB 140320A: Swift/UVOT Upper Limits
  57. GRB 140320C: Swift-XRT observations
  58. GRB 140320A: Confirmation of a fading X-ray afterglow
  59. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  60. GRB 140320A: Fermi GBM detection
  61. GRB 140320B: Swift-XRT detection of the afterglow
  62. GRB 140320C: Mondy optical observations
  63. GRB 140320A: Enhanced Swift-XRT position
  64. GRB 140320A: Swift-XRT detection of an afterglow candidate
  65. GRB 140320C: A long GRB detected by INTEGRAL
  66. GRB 140320B: ISON-NM optical observations
  67. GRB 140320B: A long GRB detected by INTEGRAL
  68. Swift Trigger 592558 is not an astrophysical source
  69. GRB 140318A: Continued RATIR Optical and NIR Observations
  70. GRB 140318A: Mondy optical limit
  71. GRB 140318A: Swift/UVOT Upper Limits
  72. GRB 140318A: Swift-BAT refined analysis
  73. GRB 140311B: Mondy optical limit
  74. GRB 140311A: Mondy optical limits
  75. GRB 140318A: Swift-XRT refined Analysis
  76. GRB 140318A: Enhanced Swift-XRT position
  77. GRB 140318A: RATIR Optical and NIR Detections
  78. GRB140318A: Discovery Channel Telescope Optical Detection
  79. GRB 140318A: NOT detection of the afterglow
  80. GRB 140318A: Swift detection of a burst
  81. GRB140308A: Suzaku WAM observation of the prompt emission
  82. GRB 140311C: MASTER optical observations
  83. GRB 140311C: Swift-XRT and UVOT observations
  84. GRB 140311C: MASTER before, during and after trigger optical observations
  85. GRB 140311A: RATIR Optical and NIR Detection
  86. GRB 140311C: Fermi GBM Detection
  87. GRB 140311A: Montarrenti Observatory optical upper limit
  88. GRB 140311A: Swift/UVOT Upper Limits
  89. GRB 140311B: Swift/UVOT Upper Limits
  90. Fermi416242156: possible iPTF counterpart
  91. GRB 140311B: RATIR Optical and NIR Observations
  92. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  93. GRB 140311A: Swift-XRT refined Analysis
  94. GRB 140302A: GROND confirmation of the afterglow
  95. GRB 140311B: Swift-XRT refined Analysis
  96. GRB 140311A: Swift-BAT refined analysis
  97. GRB 140311A: Enhanced Swift-XRT position
  98. GRB 140311B: Enhanced Swift-XRT position
  99. GRB 140311A: Recalibration of photometry of OT detected with Kottamia 188cm telescope
  100. GRB 140311B: TAROT Calern observatory optical observations

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