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"

24542 results found.

  1. GRB 230906A: Swift-XRT observations
  2. IPN triangulation of GRB 230906A (short)
  3. Fermi GRB 230906A: Global MASTER-Net observations report
  4. GRB 230812B: Chandra late-time detection of the X-ray afterglow
  5. GRB 230906A: Fermi GBM Final Localizationn
  6. GRB 230905B: GECAM-C detection of a long burst
  7. LIGO/Virgo/KAGRA S230904n: Updated Sky localization and EM Bright Classification
  8. GRB 230905A: Fermi GBM Final Real-time Localization
  9. GRB 230903A: Swift-BAT refined analysis
  10. GRB 230904C: Fermi GBM Final Localization
  11. Fermi trigger No 715552087: Global MASTER-Net observations report
  12. Fermi trigger No 715429986: Global MASTER-Net observations report
  13. Fermi GRB 230903A: Global MASTER-Net observations report
  14. GRB 230903A: Fermi GBM detection
  15. LIGO/Virgo/KAGRA S230904n: 1 counterpart neutrino candidate from IceCube neutrino searches
  16. GRB 230904B: BALROG localization (Fermi Trigger 715526984 / GRB 230904562)
  17. Fermi GRB 230904A: Global MASTER-Net observations report
  18. GRB 230904A: Fermi GBM Final Real-time Localization
  19. LIGO/Virgo/KAGRA S230904n: Identification of a GW compact binary merger candidate
  20. GRB 230903A: LCOGT Optical Upper Limits
  21. Swift GRB230903.72: Global MASTER-Net observations report
  22. GRB 230903A: Fermi GBM Final Real-time Localization
  23. Integral GRB230902.00: Global MASTER-Net observations report
  24. LIGO/Virgo/KAGRA S230831e: Updated Sky localization
  25. LIGO/Virgo/KAGRA S230831e: Identification of a GW compact binary merger candidate
  26. LIGO/Virgo/KAGRA S230820bq: Updated Sky localization
  27. LIGO/Virgo/KAGRA S230814ah: Updated Sky localization
  28. GRB 230827A: Fermi GBM Observation
  29. GRB 230826A: Swift-BAT refined analysis
  30. GRB 230828A: GRBAlpha detection
  31. GRB 230827A: VZLUSAT-2 detection
  32. GRB 230827A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  33. GRB 230826A: VZLUSAT-2 detection
  34. GRB 230827B: VZLUSAT-2 detection
  35. GRB 230827B / GRB 230827256: Fermi GBM Observation
  36. GRB 230827A: GRBAlpha detection
  37. GRB 230827A: BALROG localization (Fermi Trigger / GRB 230827762)
  38. Fermi trigger No 714809315: Global MASTER-Net observations report
  39. GRB 230827.256: AKO Optical follow-up of ZTF23abaanxz (AT 2023qxj)
  40. Fermi GRB 230827A: Global MASTER-Net observations report
  41. GRB 230827.256 : GIT optical follow-up of ZTF23abaanxz/AT2023qxj
  42. GRB 230827A: Fermi GBM Final Real-time Localization
  43. AT 2023qxj: ZTF discovery of the likely afterglow of Fermi GRB 230827256
  44. GRB 230826A: GRBAlpha detection
  45. GRB 230826A: Fermi GBM Observation
  46. Swift J1727.8-1613 (GRB 230824A): Leavitt Observatory optical observations
  47. Swift J1727.8-1613 (GRB 230824A): GAD Observatory La Spezia - optical observations
  48. GRB 230826A: Swift detection of a burst
  49. GRB 230826A: Fermi GBM Final Real-time Localization
  50. Swift GRB230826.81: Global MASTER-Net observations report
  51. Swift J1727.8-1613 (GRB 230824A): Bassano Bresciano Observatory optical observations
  52. LIGO/Virgo/KAGRA S230825k: Upper limits from Swift/BAT-GUANO
  53. Swift GRB230825.85: Global MASTER-Net observations report
  54. Swift J1727.8-1613 (GRB 230824A): Skynet Optical Observations
  55. Swift GRB230825.75: Global MASTER-Net observations report
  56. NICER detection of Swift J1727.8-1613 (GRB 230824A)
  57. LIGO/Virgo/KAGRA S230825k: Updated Sky localization
  58. LIGO/Virgo/KAGRA S230825k: Identification of a GW compact binary merger candidate
  59. Fermi trigger No 714618399: Global MASTER-Net observations report
  60. GRB 230824A: AKO Optical Afterglow Candidate
  61. Trigger 1186982: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  62. Integral GRB230824.72: Global MASTER-Net observations report
  63. GRB 230824A: Swift detection of a burst
  64. Swift GRB230824.58: Global MASTER-Net observations report
  65. LIGO/Virgo/KAGRA S230824r: Updated Sky localization
  66. LIGO/Virgo/KAGRA S230824r: Identification of a GW compact binary merger candidate
  67. Swift GRB230824.10: Global MASTER-Net observations report
  68. GRB 230822A: Fermi GBM Observation
  69. LIGO/Virgo/KAGRA S230822bm: Upper limits from Swift/BAT-GUANO
  70. GRB 230822A: Swift/BAT-GUANO detection of a burst
  71. IceCube-230823A: Event likely due to background
  72. IceCube-230823A - IceCube observation of a high-energy neutrino candidate track-like event
  73. GRB 230812B: AstroSat LAXPC detection
  74. GRB 230818B: VZLUSAT-2 detection
  75. GRID detection of GRB 230818A
  76. LIGO/Virgo/KAGRA S230822bm: Updated Sky localization
  77. GRB 230822A: Fermi GBM Final Real-time Localization
  78. LIGO/Virgo/KAGRA S230822bm: Identification of a GW compact binary merger candidate
  79. Swift GRB230821.64: Global MASTER-Net observations report
  80. GRB 230818A: Swift-BAT refined analysis
  81. Konus-Wind detection of GRB 230818A
  82. GRB 230812B : GRANDMA/Kilonova-Catcher optical afterglow detection and upper limits
  83. Swift GRB230820.81: Global MASTER-Net observations report
  84. Swift GRB230820.80: Global MASTER-Net observations report
  85. LIGO/Virgo/KAGRA S230820bq: Identification of a GW compact binary merger candidate
  86. Swift GRB230820.82: Global MASTER-Net observations report
  87. GRB 230818A: Fermi GBM Observation
  88. LIGO/Virgo/KAGRA S230819ax: Updated Sky localization
  89. LIGO/Virgo/KAGRA S230819ax: Identification of a GW compact binary merger candidate
  90. Fermi GRB 230818A: Global MASTER-Net observations report
  91. Fermi trigger No 713974668: Global MASTER-Net observations report
  92. GRB 230818A: Swift detection of a burst
  93. GRB 230818A: Fermi GBM Final Real-time Localization
  94. Swift GRB230818.98: Global MASTER-Net observations report
  95. Swift GRB230818.98: Global MASTER-Net OT detection
  96. GRB 230816A: Swift-BAT refined analysis
  97. GRB 230816A: SVOM/C-GFT optical detection
  98. Fermi GRB 230817A: Global MASTER-Net observations report
  99. GRB 230817A: BALROG localization (Fermi Trigger 713966581 / GRB 230817502)
  100. GRB 230817A: Fermi GBM Final Real-time Localization

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