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"

14941 results found.

  1. IceCube-230707B - IceCube observation of a high-energy neutrino candidate track-like event
  2. GRB 230707B: Fermi GBM Final Real-time Localization
  3. IceCube-230707A - IceCube observation of a high-energy neutrino candidate track-like event
  4. GRB 230707A: Fermi GBM Detection
  5. GRB 230707A: Fermi GBM Final Real-time Localization
  6. GRB 230625A: Detection by GRID
  7. ZTF23aaoohpy/AT2023lcr: AMI-LA radio detection
  8. GRB 230626A: VZLUSAT-2 detection
  9. GRB 230328B: LBT detection of the likely host galaxy
  10. Konus-Wind detection of GRB 220623A
  11. GRB 230701B: AstroSat CZTI detection
  12. GRB 230628E: Swift/UVOT Detection
  13. GRB 230702A: Fermi GBM Final Real-time Localization
  14. GRB 230701A: Fermi GBM Final Real-time Localization
  15. IPN triangulation of GRB 230625B (ultra-long)
  16. AT2023lcr (ATLAS23msn/ZTF23aaoohpy): ALMA 100 GHz Detection
  17. GRB 230625B: CALET Gamma-Ray Burst Monitor detection
  18. GRB 230625B: AstroSat CZTI detection
  19. GRB230628E: VLT optical identification of afterglow candidate
  20. GRB 230628E: Swift detection of a burst
  21. GRB 230628D: Fermi GBM Final Real-time Localization
  22. GRB 230628C: Fermi GBM Final Real-time Localization
  23. GRB 230628B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  24. GRB 230623B: CALET Gamma-Ray Burst Monitor detection
  25. ZTF23aaoohpy /AT2023lcr: TNG NIR detection
  26. GRB 230628A: Fermi GBM Final Localization
  27. LIGO/Virgo/KAGRA S230627c: Additional observations from the Zwicky Transient Facility
  28. GRB 230626A: GRBAlpha detection
  29. LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations
  30. GRB230626A: Fermi GBM Detection
  31. Konus-Wind detection of GRB 230616A
  32. LIGO/Virgo/KAGRA S230627c: Zwicky Transient Facility observations and candidates
  33. GRB 230625B: Swift/BAT-GUANO detection of a long burst
  34. GRB 230625A: Fermi GBM Final Real-time Localization
  35. INTEGRAL upper limit on any GRB associated with ZTF23aaoohpy/AT2023lcr
  36. GRB 230623B: Swift/BAT-GUANO detection of a long burst outside the coded FOV 
  37. MAXI GRB 230623A: MASTER optical observations
  38. GRB 230623A: MAXI/GSC detection
  39. ZTF23aaoohpy/AT2023lcr: SAO RAS observations
  40. Fermi GBM-230619: AstroSat CZTI non-detection and upper limits for the sub-threshold candidate
  41. GRB 230622A: Swift detection of a burst
  42. GRB 230621A: Fermi GBM Final Localization Correction
  43. Fermi GBM-230619: A soft subthreshold candidate potentially associated with a subthreshold LIGO/Virgo compact binary merger candidate
  44. AT2023lcr: VLA radio detection
  45. ZTF23aaoohpy/AT2023lcr: Montarrenti Observatory optical observations
  46. ZTF23aaoohpy (AT2023lcr/ATLAS23msn): Upper limits from Konus-Wind observations
  47. ZTF23aaoohpy (AT2023lcr/ATLAS23msn): Swift/UVOT detection
  48. IPN triangulation of GRB 230616A (short)
  49. AT2023lcr: Neil Gehrels Swift Observatory X-ray detection
  50. ZTF23aaoohpy/AT2023lcr: Liverpool Telescope detection
  51. GRB 230618A: Osservatorio Astronomico Nastro verde upper limit
  52. ZTF23aaoohpy/AT2023lcr: GOTO early optical observations and constraint
  53. ZTF23aaoohpy/AT2023lcr: Zwicky Transient Facility discovery of a fast fading red transient
  54. LIGO/Virgo/KAGRA S230615az: GRANDMA observations of GOTO and GIT candidates
  55. GRB 230618B: Fermi GBM Final Real-time Localization
  56. GRB 230618A: Swift detection of a burst
  57. GRB 230617A: Fermi GBM Final Real-time Localization
  58. LIGO/Virgo/KAGRA S230615az: Non-Detections of GROWTH-India Candidates from GECKO Optical Observations
  59. GRB 230614C: GRBAlpha detection
  60. GRB 230616A: AstroSat CZTI detection
  61. GRB 230616A: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  62. GRB 230614C: AstroSat CZTI detection
  63. GRB 230614C: Fermi GBM Detection
  64. GRB 230614B: Swift/BAT-GUANO detection outside the coded FOV
  65. GRB 230614B: Fermi GBM Final Real-time Localization
  66. GRB 230614A: Fermi GBM Final Real-time Localization
  67. GRB 230608A: CALET Gamma-Ray Burst Monitor detection
  68. GRB 230608A: AstroSat CZTI detection
  69. GRB 230608A: AGILE detection
  70. ZTF and GIT Observations of the Candidate Optical Afterglow AT2023jxk
  71. GRB 230606A: BOOTES-5/JGT optical upper limit
  72. LIGO/Virgo/KAGRA S230602ap: Zwicky Transient Facility observations
  73. GRB 230604A: GRBAlpha detection
  74. GRB 230606A: Swift detection of a burst
  75. Super-Kamiokande: Neutrino search for SN2023ixf
  76. GRB 230604A: AstroSat CZTI detection of a short GRB
  77. IceCube-230603A - IceCube observation of a high-energy neutrino candidate track-like event
  78. GRB 230603A: Fermi GBM Final Real-time Localization
  79. GRB 230521A: VZLUSAT-2 detection
  80. GRB 230522A: GRBAlpha and VZLUSAT-2 joint detection
  81. GRB 230525A: CALET Gamma-Ray Burst Monitor detection
  82. LIGO/Virgo/KAGRA S230529ay: Zwicky Transient Facility observations
  83. LIGO/Virgo/KAGRA S230528a: Zwicky Transient Facility observations
  84. LIGO/Virgo/KAGRA S230527ch: Zwicky Transient Facility observations
  85. LIGO/Virgo/KAGRA S230529ay: AstroSat CZTI non-detection and upper limits
  86. LIGO/Virgo/KAGRA S230529ay: Upper limits from Fermi-GBM Observations
  87. GRB 230529A: Fermi GBM Final Real-time Localization
  88. GRB 230525A: Fermi GBM Detection
  89. GRB 230525A: Fermi GBM Final Localization
  90. GRB 230523B: GRBAlpha detection
  91. LIGO/Virgo/KAGRA S230524x: Retraction of GW compact binary merger candidate
  92. IceCube-230524A - IceCube observation of a high-energy neutrino candidate track-like event
  93. GRB 230524B: AstroSat CZTI detection
  94. GRB 230524A: AstroSat CZTI detection
  95. GRB 230524A: AGILE detection
  96. GRB 230524A: Fermi GBM Final Real-time Localization
  97. LIGO/Virgo/KAGRA S230521k: MASTER new OT discovery
  98. GRB 230523B: Name correction from GCN Circular 33859
  99. GRB 230523A: Swift/BAT-GUANO detection of a short hard burst
  100. LIGO/Virgo/KAGRA S230521k: Additional candidates from Zwicky Transient Facility

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