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"

11622 results found.

  1. IPN triangulation of GRB 240603A
  2. GRB 240605B: Fermi GBM Final Real-time Localization
  3. GRB 240604A: Fermi GBM Final Localization
  4. GRB 240605A: Fermi GBM Final Real-time Localization
  5. Fermi GRB 240603C: Global MASTER-Net observations report
  6. GRB 240603A: Fermi GBM Final Localization
  7. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  8. GRB 240603C: Fermi GBM Final Real-time Localization
  9. Fermi GRB 240602A: Global MASTER-Net observations report
  10. GRB 240602A: Fermi GBM Final Real-time Localization
  11. GRB 240527B: Swift-XRT afterglow detection
  12. GRB 240527B: Fermi GBM Observation
  13. Fermi GRB 240527A: Global MASTER-Net observations report
  14. GRB 240527B: Fermi-LAT detection
  15. Fermi GRB 240527B: Global MASTER-Net observations report
  16. GRB 240527B: Fermi GBM Final Localization
  17. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  18. GRB 240527A: Fermi GBM Final Real-time Localization
  19. Fermi trigger No 738348224: Global MASTER-Net observations report
  20. Fermi trigger No 738330463: Global MASTER-Net observations report
  21. GRB 240521B: Fermi GBM Observation
  22. Fermi GBM Sub-Threshold Detection of GRB 240516B
  23. GRB 240513A: Swift-XRT afterglow detection
  24. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  25. Fermi trigger No 737996942: Global MASTER-Net observations report
  26. GRB 240516B: AstroSat CZTI detection
  27. GRB 240514B: VZLUSAT-2 detection
  28. GRB 240504A: VZLUSAT-2 detection
  29. GRB 240502A: VZLUSAT-2 detection
  30. GRB 240519A: GRBAlpha detection
  31. GRB 240519A: AstroSat CZTI detection
  32. Fermi trigger No 737788024: Global MASTER-Net observations report
  33. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  34. Fermi GRB 240517A: Global MASTER-Net observations report
  35. GRB 240516A ATCA radio observations
  36. IPN triangulation of GRB 240514B (short)
  37. GRB 240513A: Swift ToO observations
  38. GRB 240517A: Fermi GBM Final Real-time Localization
  39. Konus-Wind detection of GRB 240513A
  40. GRB 240516A: AstroSat CZTI detection
  41. Fermi trigger No 737559855: Global MASTER-Net observations report
  42. GRB 240516A: Fermi GBM Observation
  43. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  44. GRB 240516A: GOTO optical upper limit
  45. Fermi trigger No 737523389: Global MASTER-Net observations report
  46. GRB 240514B: AT2024ixa/GOTO24bph is not consistent with the Fermi localisation
  47. Fermi trigger No 737476171: Global MASTER-Net observations report
  48. GRB 240514B: GOTO candidate optical counterpart
  49. Fermi Gamma-ray Burst Monitor list of triggers that are not a GRB
  50. GRB 240514B: GRBAlpha detection
  51. GRB 240514B: Fermi GBM Detection
  52. GRB 240513A: Fermi GBM observation
  53. GRB 240513A: Swift-XRT observations
  54. GRB 240514C: Fermi GBM Final Real-time Localization
  55. Fermi GRB 240514B: Global MASTER-Net observations report
  56. Fermi Gamma-ray Burst Monitor triggers 737345659/240514093 and GRB240514A are not GRBs
  57. GRB 240514B: Fermi GBM Final Real-time Localization
  58. GRB 240514A: Fermi GBM Final Real-time Localization
  59. GRB 240513A: Tiled Swift observations
  60. GRB 240513A: Fermi-LAT detection
  61. GRB 240511A: Fermi GBM Observation
  62. Fermi GRB 240513B: Global MASTER-Net observations report
  63. Fermi trigger No 737277727: Global MASTER-Net observations report
  64. GRB 240513B: Fermi GBM Final Real-time Localization
  65. GRB 240513A: AstroSat CZTI detection
  66. Fermi trigger No 737258655: Global MASTER-Net observations report
  67. GRB 240511A: J-band observations with WINTER
  68. Fermi trigger No 737247400: Global MASTER-Net observations report
  69. Fermi trigger No 737244199: Global MASTER-Net observations report
  70. Fermi trigger No 737218721: Global MASTER-Net observations report
  71. Fermi trigger No 737196587: Global MASTER-Net observations report
  72. Fermi trigger No 737168073: Global MASTER-Net observations report
  73. GRB 240511A : MITSuME Akeno optical upper limits
  74. GRB 240511A: optical afterglow detection from the NOT
  75. Fermi Gamma-ray Burst Monitor trigger 737102480/240511279 is not a GRB
  76. Fermi Gamma-ray Burst Monitor trigger 737111207/240511380 is not a GRB
  77. Fermi GBM trigger 737105243/240511311 is not a GRB
  78. Fermi trigger No 737173236: Global MASTER-Net observations report
  79. Fermi GRB 240511A: Global MASTER-Net observations report
  80. Fermi trigger No 737105243: Global MASTER-Net observations report
  81. Fermi Gamma-ray Burst Monitor trigger 737133200/240511634 is not a GRB
  82. Fermi trigger No 737152719: Global MASTER-Net observations report
  83. GRB 240511A: Fermi GBM Final Real-time Localization
  84. Fermi trigger No 737102480: Global MASTER-Net observations report
  85. Fermi trigger No 737111207: Global MASTER-Net observations report
  86. Fermi Gamma-ray Burst Monitor trigger 737076431/240510977 is not a GRB
  87. Fermi trigger No 736967879: Global MASTER-Net observations report
  88. Fermi Gamma-ray Burst Monitor trigger 230925241/717313591 is not a GRB
  89. GRB 240504A: Fermi GBM Observation
  90. Fermi Gamma-ray Burst Monitor trigger 736837160/240508208 is not a GRB
  91. Fermi trigger No 736733320: Global MASTER-Net observations report
  92. IPN triangulation of GRB 240504A
  93. GRB 240504A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  94. Fermi GBM triggers 736668287/240506253 and 736669277/240506265 are not GRBs
  95. Fermi trigger No 736564880: Global MASTER-Net observations report
  96. IceCube-240424A: GRANDMA Optical Upper Limit of Fermi J2151.3+0220
  97. GRB 240502C: Zeiss-1000 at Koshka observatory observations of GOTO optical counterpart candidates
  98. Fermi trigger No 736461232: Global MASTER-Net observations report
  99. IPN triangulation of GRB 240501B and GRB 240501A - possible episodes of ultra long GRB
  100. Fermi GRB 240504A: Global MASTER-Net observations report

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