Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
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"
  1. LIGO/Virgo S190718y: Coverage and upper limits from MAXI/GSC observations
  2. LIGO/Virgo S190718y: Upper limits from CALET observations
  3. GRB 190719A: Fermi GBM Final Real-time Localization
  4. GRB 190718A: Swift-BAT refined analysis
  5. LIGO/Virgo S190718y: No counterpart candidates in the Swift/BAT Observations
  6. LIGO/Virgo S190718y: Upper limits from Fermi-GBM Observations
  7. LIGO/Virgo S190630ag: Updated sky localization
  8. GRB 190718A: Swift-XRT refined Analysis
  9. LIGO/Virgo S190718y: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  10. LIGO/Virgo S190718y : no neutrino counterpart candidate in ANTARES search
  11. GRB 190718A: Swift/UVOT Upper Limits
  12. LIGO/Virgo S190718y Global MASTER-Net observations report
  13. LIGO/Virgo S190718y: Identification of a GW compact binary merger candidate
  14. LIGO/Virgo S190718y: Upper limits from IceCube neutrino searches
  15. GRB 190718A: FRAM-Auger optical limit
  16. GRB 190718A: Enhanced Swift-XRT position
  17. Swift GRB190718.2 Global MASTER-Net observations report
  18. GRB 190718A: Swift detection of a burst
  19. GRB 190613B: FRAM-Auger afterglow detection
  20. Fermi trigger No 585007213 Global MASTER-Net observations report
  21. GRB 190716A: BALROG localization (Fermi Trigger 585007213 / GRB 190716917)
  22. GRB 190716A: Fermi GBM Final Real-time Localization
  23. Fermi trigger No 584977168 Global MASTER-Net observations report
  24. GRB 190714A: an X-ray flare from 2E 1624.6+1504/UCAC4 525-061488
  25. Fermi trigger No 584929684 Global MASTER-Net observations report
  26. Fermi trigger No 584929684 Global MASTER-Net observations report
  27. GRB 190708B: confirmation of the X-ray afterglow
  28. IceCube-190712A: Upper limits from a search for additional neutrino events in IceCube
  29. Fermi trigger No 584804684 Global MASTER-Net observations report
  30. GRB 190714B: Fermi GBM Final Real-time Localization
  31. GRB 190714A: Tiled Swift observations
  32. GRB 190714A: MAXI/GSC detection
  33. Fermi trigger No 584710308 Global MASTER-Net observations report
  34. IceCube-190712A : Upper limits from Insight-HXMT/HE observations
  35. Fermi-LAT Gamma-ray Observations of IceCube-190712A
  36. IceCube-190712A: No neutrino counterpart candidates in ANTARES search
  37. Fermi trigger No 584637077 Global MASTER-Net observations report
  38. IceCube-190712A: Upper limits from Fermi-GBM Observations
  39. GRB 190706D: Insight-HXMT/HE detection
  40. GRB 190706C: Insight-HXMT/HE detection
  41. IceCube Alert 190712.05 Global MASTER-Net observations report
  42. IceCube-190712A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  43. IceCube-190712A - IceCube observation of a high-energy neutrino candidate event
  44. Fermi trigger No 584590606 Global MASTER-Net observations report
  45. GRB 190712A: Fermi GBM Final Real-time Localization
  46. Fermi trigger No 584583925 Global MASTER-Net observations report
  47. GRB 190708B: Swift-XRT observations
  48. LIGO/Virgo S190706ai: Upper limits from Insight-HXMT/HE observations
  49. Fermi trigger No 584465880 Global MASTER-Net observations report
  50. Fermi trigger No 584404689 Global MASTER-Net observations report
  51. LIGO/Virgo S190706ai: Updated sky localization
  52. LIGO/Virgo S190707q: Updated sky localization
  53. Konus-Wind observation of GRB 190706D
  54. LIGO/Virgo S190707q: MASTER OT seach result
  55. LIGO/Virgo S190707q: No counterpart candidates in the CNEOST
  56. LIGO/Virgo S190707q: No counterpart candidates in the Swift/BAT Observations
  57. Konus-Wind observation of GRB 190708B
  58. Konus-Wind observation of GRB 190706C
  59. GRB 190708B: Tiled Swift observations
  60. MAXI GRB190708.83 Global MASTER-Net observations report
  61. GRB 190706C: CALET Gamma-Ray Burst Monitor detection
  62. GRB 190708B: MAXI/GSC detection
  63. IPN triangulation of GRB 190706D (short)
  64. IPN triangulation of GRB 190706C (long/very bright)
  65. Fermi trigger No 584264100 Global MASTER-Net observations report
  66. LIGO/Virgo S190707q: Upper limits from CALET observations
  67. Konus-Wind observation of GRB 190704A
  68. LIGO/Virgo S190707q: No counterpart candidates in Fermi-LAT observations
  69. GRB 190708A: Fermi GBM Final Real-time Localization
  70. LIGO/Virgo S190707q: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observations
  71. LIGO/Virgo S190706ai: No counterpart candidates in KAIT observations
  72. LIGO/Virgo S190706ai: No transient candidates from CALET observations
  73. LIGO/Virgo S190707q: Upper limits from Fermi-GBM Observations
  74. LIGO/Virgo S190706ai: No counterpart candidates in the Swift/BAT Observations
  75. IPN triangulation of GRB 190704A (short)
  76. GRB 190706B: Swift/UVOT Detection
  77. LIGO/Virgo S190707q Global MASTER-Net observations report
  78. LIGO/Virgo S190706ai: No counterpart candidates in Fermi-LAT observations
  79. LIGO/Virgo S190701ah: No counterpart candidates in Fermi-LAT observations
  80. LIGO/Virgo S190707q: Upper limits from AGILE-GRID observations
  81. LIGO/Virgo S190707q: No counterpart candidates in AGILE-MCAL observations
  82. LIGO/Virgo S190707q: No counterpart candidates in HAWC observations
  83. LIGO/Virgo S190706ai: Upper limits from Fermi-GBM Observations
  84. LIGO/Virgo S190701ah: GRAWITA VST-ESO PARANAL observations
  85. LIGO/Virgo S190707q: Coverage and upper limits from MAXI/GSC observations
  86. LIGO/Virgo S190707q : No neutrino counterpart candidates in ANTARES search
  87. LIGO/Virgo S190707q: Identification of a GW compact binary merger candidate
  88. LIGO/Virgo S190707q: Upper limits from IceCube neutrino searches
  89. LIGO/Virgo S190706ai: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observations
  90. LIGO/Virgo S190706ai: No neutrino counterpart candidates in ANTARES search
  91. GRB 190707B: Fermi GBM Final Real-time Localization
  92. LIGO/Virgo S190706ai: Upper limits from AGILE-GRID observations
  93. GRB 190707A: BALROG localization (Fermi Trigger 584175010 / GRB 190707285)
  94. GRB 190707A: Fermi GBM Final Real-time Localization
  95. LIGO/Virgo S190706ai: No counterpart candidates in HAWC observations
  96. GRB 190706B: Swift-BAT refined analysis
  97. LIGO/Virgo S190706ai: Coverage and upper limits from MAXI/GSC observations
  98. LIGO/Virgo S190706ai: No counterpart candidates in AGILE-MCAL observations
  99. LIGO/Virgo S190706ai Global MASTER-Net observations report
  100. GRB 190706B: Swift-XRT refined Analysis

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