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"

27302 results found.

  1. Fermi trigger No 582012834 Global MASTER-Net observations report
  2. Fermi trigger No 581986074 Global MASTER-Net observations report
  3. GRB 190611B: Fermi GBM detection
  4. GRB 190611A: Swift-XRT refined Analysis
  5. GRB 190611A: Swift/UVOT Upper Limits
  6. GRB 190611A, Swift-BAT refined analysis
  7. Fermi trigger No 582004649 Global MASTER-Net observations report
  8. GRB 190612A: Fermi GBM Final Real-time Localization
  9. GRB 190611A: Swift detection of a burst
  10. GRB 190610A: Swift-BAT refined analysis
  11. GRB 190610A: Insight-HXMT/HE detection
  12. Fermi trigger No 581889628 Global MASTER-Net observations report
  13. GRB 190610C: Fermi GBM Final Real-time Localization
  14. Fermi trigger No 581882394 Global MASTER-Net observations report
  15. GRB190610B: BALROG localization (Fermi Trigger 581882394 / GRB 190610750)
  16. GRB 190610B: Fermi GBM Final Real-time Localization
  17. Fermi trigger No 581841498 Global MASTER-Net observations report
  18. GRB 190610A: Swift detection of a short burst
  19. GRB190609A: BALROG localization (Fermi Trigger 581758450 / GRB 190609315)
  20. GRB 190609A: Fermi GBM Final Real-time Localization
  21. Fermi trigger No 581719018 Global MASTER-Net observations report
  22. Fermi trigger No 581645543 Global MASTER-Net observations report
  23. GRB 190608A: Fermi GBM Final Real-time Localization
  24. GRB 190606A: Insight-HXMT/HE detection
  25. IPN Triangulation of GRB 190606A (short)
  26. GRB 190606A: Fermi GBM detection
  27. GRB 190604B: VLT Afterglow Detection
  28. GRB 190606A: Fermi-LAT detection
  29. GRB 190605B: Insight-HXMT/HE detection
  30. Fermi trigger No 581478912 / GRB 190606A: AGILE/MCAL observations
  31. GRB 190604A: Insight-HXMT/HE detection
  32. Fermi trigger No 581478912 Global MASTER-Net observations report
  33. Fermi trigger No 581469752 Global MASTER-Net observations report
  34. GRB 190605A: Fermi GBM Final Real-time Localization
  35. GRB 190604B: Swift-BAT refined analysis
  36. GRB 190604B: BOOTES-3 early optical limits
  37. GRB 190604B: Swift-XRT refined Analysis
  38. GRB190604B: Swift/UVOT detection
  39. GRB 190604B: Swift detection of a burst
  40. Fermi trigger No 581337762 Global MASTER-Net observations report
  41. GRB190604A: BALROG localization (Fermi Trigger 581337762 / GRB 190604446)
  42. GRB 190604A: Fermi GBM Final Real-time Localization
  43. GRB 190531B: CALET Gamma-Ray Burst Monitor detection
  44. LIGO/Virgo S190602aq: AstroSat CZTI upper limits
  45. LIGO/Virgo S190602aq: Upper limits from CALET observations
  46. LIGO/Virgo S190602aq: Upper limits from Insight-HXMT/HE observations
  47. Fermi trigger No 581281470 Global MASTER-Net observations report
  48. GRB 190603A: Fermi GBM Final Real-time Localization
  49. GRB 190531B: Swift/UVOT Upper Limits
  50. GRB 190530A: R-band observation from HCT
  51. LIGO/Virgo S190602aq: upper limit in INTEGRAL SPI-ACS prompt observations
  52. LIGO/Virgo S190602aq: No counterpart candidates in Fermi-LAT observations
  53. LIGO/Virgo S190602aq: No counterpart candidates in the Swift/BAT Observations
  54. LIGO/Virgo S190602aq: Upper limits from Fermi-GBM Observations
  55. LIGO/Virgo S190602aq Global MASTER-Net observations report
  56. LIGO/Virgo S190602aq: Coverage and upper limits from MAXI/GSC observations
  57. LIGO/Virgo S190602aq: No counterpart candidates in HAWC observations
  58. GRB 190530A: Insight-HXMT/HE detection
  59. GRB 190531B: Insight-HXMT/HE detection
  60. Fermi trigger No 581068049 Global MASTER-Net observations report
  61. GRB 190531B: MASTER optical observation
  62. GRB 190531B: Fermi GBM observations
  63. Fermi Fermi trigger No 581002688 Global MASTER-Net observations report
  64. GRB 190530A: Swift/UVOT Detection
  65. GRB 190531B: Fermi-LAT detection
  66. GRB 190531B: name correction re. GCN 24696
  67. Fermi Trigger 581026217 / GRB 190531840 / GRB190531A: BALROG localization
  68. GRB 190531B: Fermi GBM Final Real-time Localization
  69. GRB 190530A: Fermi GBM observation
  70. GRB 190531A: Fermi GBM Final Real-time Localization
  71. GRB 190530A: COATLI Optical Detection of the Fading Afterglow
  72. GRB 190530A: OAJ optical detection
  73. Fermi GRB190530.43 Global MASTER-Net observations report
  74. GRB 190530A: Fermi-LAT detection
  75. GRB 190530A: AGILE-MCAL detection
  76. Fermi Trigger 580904353 / GRB 190530430 / GRB190530A: BALROG localization
  77. GRB 190530A: Fermi GBM Final Real-time Localization
  78. LIGO/Virgo S190425z: No counterpart candidate in Zadko-GRANDMA observations.
  79. LIGO/Virgo S190518bb: AstroSat CZTI upper limits
  80. LIGO/Virgo S190521g: AstroSat CZTI upper limits
  81. LIGO/Virgo S190517h: AstroSat CZTI upper limits
  82. LIGO/Virgo S190519bj: AstroSat CZTI upper limits
  83. GRB 190525A: Insight-HXMT/HE detection
  84. Fermi GRB190525.67 Global MASTER-Net observations report
  85. Fermi GRB190525.03 Global MASTER-Net observations report
  86. GRB 190525A: Fermi GBM Final Real-time Localization
  87. LIGO/Virgo S190521r: No optical counterpart from SVOM/GWAC-F30 observations.
  88. LIGO/Virgo S190521r: No optical counterpart from SVOM/GWAC observations.
  89. LIGO/Virgo S190521g: No optical counterpart from SVOM/GWAC-F30 observations.
  90. LIGO/Virgo S190521g: No optical counterpart from SVOM/GWAC observations.
  91. LIGO/Virgo S190524q: Retraction of GW compact binary merger candidate
  92. LIGO/Virgo S190524q Global MASTER-Net observations report
  93. Konus-Wind observation of GRB 190519A
  94. LIGO/Virgo S190521g: Upper limits from Insight-HXMT/HE observations
  95. LIGO/Virgo S190521r: No transient candidates from CALET observations
  96. LIGO/Virgo S190521g: Upper limits from CALET observations
  97. LIGO/Virgo S190521g: Swift/BAT Counterpart Search
  98. LIGO/Virgo S190521r: Swift/BAT Counterpart Search
  99. LIGO/Virgo S190521r: Coverage and upper limits from Fermi-LAT observations
  100. LIGO/Virgo S190521r: Upper limits from Fermi-GBM 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