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"

27408 results found.

  1. GRB 141212A: Swift/UVOT Upper Limits
  2. GRB 141212B: Swift/UVOT Upper Limits
  3. GRB 141212A: Gemini-N spectroscopy and photometry
  4. GRB 141212B: Swift-BAT refined analysis
  5. GRB 141212A: Swift-BAT refined analysis
  6. Swift detection of 4U 1700+24 (= V934 Her)
  7. GRB 141212A: Swift-XRT refined Analysis
  8. GRB 141212B: initial Swift/UVOT observations
  9. GRB 141212B: Swift/XRT preliminary localization
  10. GRB 141212A: MASTER early optical observations
  11. GRB 141212A: Skynet R-COP Observations
  12. GRB 141212B: Swift detection of a burst
  13. GRB 141212A: Swift detection of a short burst
  14. GRB141208.63: MASTER OT Detection During the Fermi Error Box inspection
  15. GRB141207A: Discovery Channel Telescope Optical Observations
  16. GRB 141207A: Fermi GBM detection
  17. Konus-Wind observation of GRB 141130A
  18. GRB 141207A: Fermi-LAT Detection
  19. GRB141121A: Discovery Channel Telescope Optical Observations
  20. GRB 141205A: Swift/UVOT Upper Limits
  21. GRB 141205A: Fermi GBM detection
  22. GRB 141205A: Nanshan optical upper limit
  23. GRB 141205A Swift-BAT refined analysis
  24. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  25. GRB 141205A Short hard GRB found in ground analysis of BAT data
  26. GRB 141202A: Swift XRT observations
  27. GRB 141202A: Fermi GBM Detection
  28. IPN Triangulation of GRB 141202A (short/hard)
  29. GRB 141121A: Continued RATIR Optical Observations
  30. GRB 141130A: Swift-BAT refined analysis
  31. GRB 141130A: Swift/UVOT Detection
  32. GRB 141130A: Swift-XRT refined Analysis
  33. GRB 141130A: Mondy optical observations
  34. GRB 141130A: Swift detection of a burst with an optical counterpart
  35. GRB 141121A: Continued RATIR Optical Observations
  36. GRB 141121A: Continued RATIR Optical Observations
  37. IPN Triangulation of GRB 141121A (initial episode)
  38. GRB 141121A: SPI-ACS/INTEGRAL observations
  39. GRB 141121A: RATIR Optical and NIR Observations
  40. Konus-Wind observation of GRB 141121A
  41. IPN Triangulation of GRB 141125A (short/hard)
  42. GRB 141121A: Continued RATIR Optical Observations
  43. GRB 141121A: Continued Mondy optical observations
  44. GRB 141121A: Continued RATIR Optical Observations
  45. GRB 141121A: RATIR Optical Observations - Steeper Fading
  46. GRB 141124A​: iPTF upper limits​
  47. GRB 141121A: RATIR Optical Observations - Fading Again
  48. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  49. GRB 141118A: Fermi GBM Detection
  50. GRB 141121A: LCO-FTN rebrightening confirmation
  51. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  52. GRB 141121A: Continued RATIR Optical Observations
  53. GRB 141121A: Swift-XRT refined Analysis
  54. GRB 141121A: Swift/UVOT Detections
  55. GRB 141121A: RATIR Optical Observations
  56. GRB 141121A: Swift-BAT refined analysis
  57. GRB 141121A: LCO-FTN observations
  58. GRB 141118A: iPTF Optical Observations
  59. GRB 141121A: GROND Afterglow candidate
  60. GRB 141121A: MAXI/GSC detection
  61. GRB 141121A: Swift detection of a burst
  62. IPN Triangulation of GRB 141118A
  63. GRB 141109A: further VLA observations
  64. GRB 141104A: further Swift-XRT observations and afterglow candidate
  65. Swift Trigger 618673: probable noise event
  66. Trigger 618634: Swift detection of Vela X-1
  67. GRB 141015A: TAROT La Silla observatory optical observations
  68. GRB 141022A: TAROT La Silla observatory optical observations
  69. GRB 141031A: TAROT La Silla observatory optical observations
  70. GRB 141109A: TAROT La Silla observatory optical observations
  71. Swift Trigger 618402: probable noise event
  72. Swift Trigger 618391 is not an astrophysical event
  73. GRB 141109A: Terskol photometry
  74. GRB 141109B: Swift/UVOT Upper Limits
  75. GRB 141109A: Swift/UVOT Detection
  76. Konus-Wind observation of GRB 141109A
  77. GRB 141109B: Swift-XRT refined Analysis
  78. Swift Trigger 618134 is not an astrophysical event
  79. GRB 141109A: Swift-XRT refined Analysis
  80. GRB 141109B: BOOTES-4 and TERSKOL optical upper limit
  81. GRB 141109B: Swift-BAT refined analysis
  82. GRB 141109A: Swift-BAT refined analysis
  83. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  84. GRB 141109A: GROND afterglow observation
  85. GRB 141109B: Swift detection of a burst
  86. GRB 141109A: Swift detection of a burst
  87. GRB 141104A: Swift-XRT observations
  88. GRB 141026A: Gemini-North optical and NIR imaging
  89. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  90. IPN Triangulation of GRB 141104A (long/very bright)
  91. GRB 141102A possible precursor was another, known source
  92. Konus-Wind observation of GRB 141102A
  93. GRB 141022A: Skynet PROMPT-CTIO Observations
  94. GRB 141102A: Fermi-LAT detection
  95. GRB 141102A: Fermi GBM detection
  96. GRB 141102A found in ground analysis of BAT data
  97. GRB 141031B: RATIR Optical and NIR Observation
  98. GRB 141031B: Swift/UVOT Upper Limits
  99. GRB 141031B: Swift-XRT refined Analysis
  100. GRB 141031B: Bassano Bresciano Observatory upper limit

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