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"

36212 results found.

  1. GRB 240516B: AstroSat CZTI detection
  2. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  3. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  4. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  5. GRB 240514B: VZLUSAT-2 detection
  6. GRB 240504A: VZLUSAT-2 detection
  7. GRB 240502A: VZLUSAT-2 detection
  8. GRB 240519A: GRBAlpha detection
  9. GRB 240516A: Swift/UVOT Upper Limits
  10. GRB 240519A: AstroSat CZTI detection
  11. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  12. GRB 240516A: Swift-BAT refined analysis
  13. Fermi GRB 240517A: Global MASTER-Net observations report
  14. GRB 240516A ATCA radio observations
  15. IPN triangulation of GRB 240514B (short)
  16. GRB 240513A: Swift ToO observations
  17. GRB 240517A: Fermi GBM Final Real-time Localization
  18. Konus-Wind detection of GRB 240513A
  19. GRB 240516A: AstroSat CZTI detection
  20. GRB 240516A: Swift-XRT refined Analysis
  21. GRB 240514E: A possible candidate BD-21 1074
  22. GRB 240516A: Fermi GBM Observation
  23. GRB 240511A: Observations from GTC/OSIRIS+
  24. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  25. GRB 240516A: GOTO optical upper limit
  26. LIGO/Virgo/KAGRA S240422ed: GRID non-detection and upper limits
  27. GRB 240516A: Swift detection of a burst
  28. GRB 240514B: AT2024ixa/GOTO24bph is not consistent with the Fermi localisation
  29. GRB 240511A: radio detection of afterglow candidate
  30. GRB 240514B: GOTO candidate optical counterpart
  31. Fermi Gamma-ray Burst Monitor list of triggers that are not a GRB
  32. GRB 240514E: MAXI/GSC detection of a probable afterglow
  33. GRB 240514B: GRBAlpha detection
  34. GRB 240514B: Fermi GBM Detection
  35. GRB 240513A: Fermi GBM observation
  36. GRB 240513A: Swift-XRT observations
  37. GRB 240514D: AstroSat CZTI detection
  38. GRB 240514C: Fermi GBM Final Real-time Localization
  39. Fermi GRB 240514B: Global MASTER-Net observations report
  40. GRB 240514B: Fermi GBM Final Real-time Localization
  41. LIGO/Virgo/KAGRA S240507p: Upper limits from Swift/BAT-GUANO
  42. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  43. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  44. GRB 240514A: Fermi GBM Final Real-time Localization
  45. GRB 240513A: Tiled Swift observations
  46. GRB 240513A: Fermi-LAT detection
  47. GRB 240511A: Fermi GBM Observation
  48. GRB 240511A: Swift-BAT refined analysis
  49. Fermi GRB 240513B: Global MASTER-Net observations report
  50. GRB 240513B: Fermi GBM Final Real-time Localization
  51. GRB 240513A: AstroSat CZTI detection
  52. GRB 240511A: J-band observations with WINTER
  53. GRB 240511A: Enhanced Swift-XRT position
  54. GRB 240511A : MITSuME Akeno optical upper limits
  55. GRB 240511A: Swift-XRT refined Analysis
  56. GRB 240511A: optical afterglow detection from the NOT
  57. Fermi Gamma-ray Burst Monitor trigger 737102480/240511279 is not a GRB
  58. Fermi Gamma-ray Burst Monitor trigger 737111207/240511380 is not a GRB
  59. Fermi GBM trigger 737105243/240511311 is not a GRB
  60. Fermi GRB 240511A: Global MASTER-Net observations report
  61. Swift GRB 240511A: Global MASTER-Net observations report
  62. Fermi Gamma-ray Burst Monitor trigger 737133200/240511634 is not a GRB
  63. GRB 240511A: Prompt enhanced Swift-XRT position
  64. GRB 240511A: Swift detection of a burst
  65. GRB 240511A: Fermi GBM Final Real-time Localization
  66. Fermi Gamma-ray Burst Monitor trigger 737076431/240510977 is not a GRB
  67. Fermi Gamma-ray Burst Monitor trigger 230925241/717313591 is not a GRB
  68. EP240506a: CrAO ZTSH optical upper limit
  69. GRB 240504A: Fermi GBM Observation
  70. Fermi Gamma-ray Burst Monitor trigger 736837160/240508208 is not a GRB
  71. IPN triangulation of GRB 240504A
  72. GRB 240502A: 1.3m DFOT Optical upper limit
  73. GRB 240504A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  74. GRB 240502C: Zeiss-1000 at Koshka observatory observations of GOTO optical counterpart candidates
  75. IPN triangulation of GRB 240501B and GRB 240501A - possible episodes of ultra long GRB
  76. Fermi GRB 240504A: Global MASTER-Net observations report
  77. GRB 240503A: AstroSat CZTI detection
  78. GRB 240504A: BALROG localization (Fermi Trigger 736492377 / GRB 240504217)
  79. GRB 240504A: Fermi GBM Final Real-time Localization
  80. LXT 240402A / GRB 240402B: VLT X-shooter redshift of host
  81. GRB 240502A: GOTO optical upper limit
  82. GRB 240502A: Fermi GBM Observation
  83. GRB 240415A 1.3m DFOT Optical upper limit
  84. GRB 240502C: GOTO possible optical counterpart candidates
  85. Fermi GRB 240502B: Global MASTER-Net observations report
  86. GRB 240502C: Fermi GBM Final Localization
  87. Fermi GRB 240502A: Global MASTER-Net observations report
  88. GRB 240501B: GRBAlpha detection
  89. GRB 240430A: GRBAlpha detection
  90. GRB 240502B: Fermi GBM Final Real-time Localization
  91. GRB 240502A long GRB detected by INTEGRAL
  92. GRB 240502A: Fermi GBM Final Real-time Localization
  93. Fermi GRB 240501A: Global MASTER-Net observations report
  94. GRB 240426A: VZLUSAT-2 detection
  95. GRB 240425A: VZLUSAT-2 detection
  96. GRB240430A: Fermi GBM Final Localization
  97. GRB 240501B: AstroSat CZTI detection
  98. GRB 240501A: Fermi GBM Final Real-time Localization
  99. GRB 240408B: VZLUSAT-2 detection
  100. GRB 240407A: VZLUSAT-2 detection

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