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"

11564 results found.

  1. GRB 240513A: Tiled Swift observations
  2. GRB 240513A: Fermi-LAT detection
  3. GRB 240511A: Fermi GBM Observation
  4. Fermi GRB 240513B: Global MASTER-Net observations report
  5. Fermi trigger No 737277727: Global MASTER-Net observations report
  6. GRB 240513B: Fermi GBM Final Real-time Localization
  7. GRB 240513A: AstroSat CZTI detection
  8. Fermi trigger No 737258655: Global MASTER-Net observations report
  9. GRB 240511A: J-band observations with WINTER
  10. Fermi trigger No 737247400: Global MASTER-Net observations report
  11. Fermi trigger No 737244199: Global MASTER-Net observations report
  12. Fermi trigger No 737218721: Global MASTER-Net observations report
  13. Fermi trigger No 737196587: Global MASTER-Net observations report
  14. Fermi trigger No 737168073: Global MASTER-Net observations report
  15. GRB 240511A : MITSuME Akeno optical upper limits
  16. GRB 240511A: optical afterglow detection from the NOT
  17. Fermi Gamma-ray Burst Monitor trigger 737102480/240511279 is not a GRB
  18. Fermi Gamma-ray Burst Monitor trigger 737111207/240511380 is not a GRB
  19. Fermi GBM trigger 737105243/240511311 is not a GRB
  20. Fermi trigger No 737173236: Global MASTER-Net observations report
  21. Fermi GRB 240511A: Global MASTER-Net observations report
  22. Fermi trigger No 737105243: Global MASTER-Net observations report
  23. Fermi Gamma-ray Burst Monitor trigger 737133200/240511634 is not a GRB
  24. Fermi trigger No 737152719: Global MASTER-Net observations report
  25. GRB 240511A: Fermi GBM Final Real-time Localization
  26. Fermi trigger No 737102480: Global MASTER-Net observations report
  27. Fermi trigger No 737111207: Global MASTER-Net observations report
  28. Fermi Gamma-ray Burst Monitor trigger 737076431/240510977 is not a GRB
  29. Fermi trigger No 736967879: Global MASTER-Net observations report
  30. Fermi Gamma-ray Burst Monitor trigger 230925241/717313591 is not a GRB
  31. GRB 240504A: Fermi GBM Observation
  32. Fermi Gamma-ray Burst Monitor trigger 736837160/240508208 is not a GRB
  33. Fermi trigger No 736733320: Global MASTER-Net observations report
  34. IPN triangulation of GRB 240504A
  35. GRB 240504A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  36. Fermi GBM triggers 736668287/240506253 and 736669277/240506265 are not GRBs
  37. Fermi trigger No 736564880: Global MASTER-Net observations report
  38. IceCube-240424A: GRANDMA Optical Upper Limit of Fermi J2151.3+0220
  39. GRB 240502C: Zeiss-1000 at Koshka observatory observations of GOTO optical counterpart candidates
  40. Fermi trigger No 736461232: Global MASTER-Net observations report
  41. IPN triangulation of GRB 240501B and GRB 240501A - possible episodes of ultra long GRB
  42. Fermi GRB 240504A: Global MASTER-Net observations report
  43. Fermi trigger No 736472503: Global MASTER-Net observations report
  44. GRB 240504A: BALROG localization (Fermi Trigger 736492377 / GRB 240504217)
  45. GRB 240504A: Fermi GBM Final Real-time Localization
  46. Fermi trigger No 736387941: Global MASTER-Net observations report
  47. GRB 240502A: GOTO optical upper limit
  48. Fermi trigger No 736379109: Global MASTER-Net observations report
  49. GRB 240502A: Fermi GBM Observation
  50. GRB 240502C: GOTO possible optical counterpart candidates
  51. Fermi GRB 240502B: Global MASTER-Net observations report
  52. GRB 240502C: Fermi GBM Final Localization
  53. Fermi GRB 240502A: Global MASTER-Net observations report
  54. GRB 240430A: GRBAlpha detection
  55. GRB 240502B: Fermi GBM Final Real-time Localization
  56. GRB 240502A: Fermi GBM Final Real-time Localization
  57. Fermi GRB 240501A: Global MASTER-Net observations report
  58. Fermi trigger No 736197684: Global MASTER-Net observations report
  59. GRB 240425A: VZLUSAT-2 detection
  60. GRB240430A: Fermi GBM Final Localization
  61. GRB 240501A: Fermi GBM Final Real-time Localization
  62. GRB 240407A: VZLUSAT-2 detection
  63. GRB 240425A: GRBAlpha detection
  64. Fermi-LAT gamma-ray observations of IceCube-240424A
  65. GRB 240429A: Fermi GBM Final Real-time Localization
  66. Fermi GRB 240428A: Global MASTER-Net observations report
  67. GRB 240428A: Fermi GBM Final Real-time Localization
  68. GRB 240425A: Fermi GBM Final Real-time Localization
  69. Fermi trigger No 735697285: Global MASTER-Net observations report
  70. GRB 240422A: Glowbug gamma-ray detection
  71. IceCube-240424A - IceCube observation of a high-energy neutrino candidate track-like event
  72. GRB 240421B: GRBAlpha detection
  73. LIGO/Virgo/KAGRA S240422ed: Upper limits from Fermi-GBM Observations
  74. Fermi trigger No 735470374: Global MASTER-Net observations report
  75. GRB 240421A: Glowbug gamma-ray detection
  76. GRB 240414A: radio detection with the VLA
  77. Fermi-LAT gamma-ray observations of IceCube-240419A
  78. Fermi GRB 240422A: Global MASTER-Net observations report
  79. GRB 240421B: AstroSat CZTI detection
  80. GRB 240422A: Fermi GBM Final Real-time Localization
  81. Fermi GRB 240421B: Global MASTER-Net observations report
  82. GRB 240421B: Fermi GBM Observation
  83. Fermi GRB 240421A: Global MASTER-Net observations report
  84. GRB 240421A: Fermi GBM Final Real-time Localization
  85. Fermi trigger No 735280430: Global MASTER-Net observations report
  86. IceCube-240419A - IceCube observation of a high-energy neutrino candidate track-like event
  87. IceCube-240419A - IceCube observation of a high-energy neutrino candidate track-like event
  88. Fermi trigger No 735089036: Global MASTER-Net observations report
  89. GRB 240411A: GOTO early optical upper limits
  90. Fermi GRB 240417A: Global MASTER-Net observations report
  91. Improved IPN triangulation of GRB 240411A
  92. GRB 240417A: Fermi GBM Final Real-time Localization
  93. GRB 240415A: Glowbug gamma-ray detection
  94. GRB 240414A: Glowbug gamma-ray detection
  95. GRB 240411A: Glowbug gamma-ray detection
  96. GRB 240415A: Fermi GBM Observation
  97. GRB 240415A: Earliest optical followup with the Kinder observations
  98. GRB 240415A: OHP/T193 optical observations
  99. GRB 240415A: optical afterglow detection from the INAF Asiago Observatory
  100. GRB 240415A: SAO RAS 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