Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

36153 results found.

  1. GRB 190701A: Prompt enhanced Swift-XRT position
  2. GRB 190701A: Swift detection of a burst
  3. GRB 190630B: KAIT Optical Afterglow Confirmation
  4. GRB 190630C: Enhanced Swift-XRT position
  5. LIGO/Virgo S190630ag: Upper limits from Fermi-GBM Observations
  6. GRB 190630C: Swift detection of a burst
  7. LIGO/Virgo S190630ag: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  8. GRB 190630B: Swift-XRT refined Analysis
  9. GRB 190630B, Swift-BAT refined analysis
  10. IceCube-190629A: Upper limits from Fermi-GBM Observations
  11. GRB 190627A: VLT/FORS2 spectroscopic redshift
  12. GRB Swift Trigger 912102: KAIT Optical Afterglow Candidate
  13. Swift Trigger 912102: possible GRB 190630B
  14. GRB 190630A: Fermi GBM Final Real-time Localization
  15. GRB 190627A: Koshka Zeiss-1000 optical counterpart observations
  16. GRB 190627A : Xinglong 2.16m optical observation
  17. GRB 190627A: Swift-XRT refined Analysis
  18. GRB 190627A: GMG observation at the second epoch
  19. GRB 190627A: NOT optical observations
  20. GRB 190627A: Optical imaging by D50 from Ondrejov
  21. GRB 190627A: NIR imaging from Liverpool Telescope
  22. GRB 190627A: Optical imaging and spectroscopy from Calar Alto
  23. GRB 190627A: NUTTelA-TAO optical counterpart observations
  24. GRB 190627A: Swift-BAT refined analysis (short-soft burst)
  25. GRB 190610A: Further Swift-XRT observations
  26. GRB 190628A: Fermi GBM Final Real-time Localization
  27. GRB 190627A: GMG observation
  28. GRB 190627A: MASTER optical counterpart observation
  29. GRB190627A: VIRT Afterglow observation
  30. GRB 190627A: Montarrenti Observatory optical detection
  31. GRB 190627A: NUTTelA-TAO optical observations
  32. GRB 190627A: Enhanced Swift-XRT position
  33. GRB 190627A: Swift/UVOT Detection
  34. GRB 190627A: Swift detection of a burst
  35. GRB 190626B: Fermi GBM Final Real-time Localization
  36. GRB 190619B: AstroSat CZTI detection
  37. GRB 190626A: Fermi GBM Final Real-time Localization
  38. Swift Trigger 911102: a possible GRB
  39. GRB 190623A: Fermi GBM Final Real-time Localization
  40. GRB 190622A: BALROG localization (Fermi Trigger 582886211 / GRB 190622368)
  41. GRB 190622A: Fermi GBM Final Real-time Localization
  42. GRB 190615B: AstroSat CZTI detection
  43. GRB 190620A: BALROG localization (Fermi Trigger 582725415 / GRB 190620507)
  44. GRB 190620A: Fermi GBM Final Real-time Localization
  45. IceCube-190619A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  46. Fermi GBM trigger 190619235/582615488 likely not a GRB
  47. GRB 190619B: BALROG localization (Fermi Trigger 582646590 / GRB 190619595)
  48. GRB 190619B: Fermi GBM Final Real-time Localization
  49. GRB 190613A: SEDM Observations
  50. GRB 190613B: JCMT SCUBA-2 sub-mm observations
  51. GRB 190619A: Fermi GBM Final Real-time Localization
  52. GRB 190613B: AstroSat CZTI detection
  53. GRB 190611B: AstroSat CZTI detection
  54. Konus-Wind observation of GRB 190613B
  55. GRB 190615B: Insight-HXMT/HE detection
  56. GRB 190615A: Insight-HXMT/HE detection
  57. GRB 190613B: Kitab observatory optical upper limit
  58. GRB 190615A: Fermi GBM Final Real-time Localization
  59. GRB 190613A: Kitab and AbAO optical upper limit
  60. GRB 190613B: SEDM Observations
  61. GRB 190613A: SEDM Observations
  62. GRB 190610A: Swift/UVOT Upper Limits
  63. GRB 190610A: Swift-XRT observations
  64. GRB 190613B: Optical observation from Asiago Schmidt
  65. GRB 190613B: GROND Detection of the Optical/NIR Afterglow
  66. GRB 190611B: CALET Gamma-Ray Burst Monitor detection
  67. GRB 190613B: Insight-HXMT/HE detection
  68. Konus-Wind observation of short/hard GRB 190610A
  69. Konus-Wind observation of GRB 190611B
  70. GRB 190613B: BOOTES-5/JGT early optical observations
  71. GRB 190613B: Optical observations from NOT
  72. GRB 190613B: Swift-XRT refined Analysis
  73. GRB 190613A: FRAM-ORM afterglow detection
  74. GRB 190610A: Swift ToO observations
  75. GRB 190613B: Swift-BAT refined analysis
  76. GRB 190613A, Swift-BAT refined analysis
  77. GRB 190613B: KAIT Optical Afterglow Confirmation
  78. GRB 190613B: Swift/UVOT Detection
  79. GRB 190613A: Fermi GBM detection
  80. GRB 190613A: Swift/UVOT Detection
  81. GRB 190613B: Fermi GBM observation
  82. GRB 190611B: BALROG localization (Fermi Trigger 581986074 / GRB 190611950)
  83. GRB 190613B: Enhanced Swift-XRT position
  84. IPN Triangulation of GRB 190611B
  85. GRB 190613A: Swift-XRT refined Analysis
  86. GRB 190613A: Enhanced Swift-XRT position
  87. GRB 190613B: BALROG localization (Fermi Trigger 582115625 / GRB 190613449)
  88. GRB 190613B: Swift detection of a burst with an optical counterpart
  89. GRB 190613B: Fermi GBM Final Real-time Localization
  90. GRB 190610A: CALET Gamma-Ray Burst Monitor detection
  91. GRB 190609A: AstroSat CZTI detection
  92. GRB 190613A: MASTER OT detection
  93. GRB 190613A: KAIT Optical Afterglow Confirmation
  94. GRB 190613A: BALROG localization (Fermi Trigger 582091643 / GRB 190613172)
  95. GRB 190613A: Fermi GBM Final Real-time Localization
  96. GRB 190613A: Swift detection of a burst with an optical counterpart
  97. GRB 190611B: Fermi GBM detection
  98. GRB 190611A: Swift-XRT refined Analysis
  99. GRB 190611A: Swift/UVOT Upper Limits
  100. GRB 190611A: Optical observations from VLT/FORS2

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