Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

36398 results found.

  1. GRB 230707B: CALET Gamma-Ray Burst Monitor detection
  2. GRB 230703A detected with multiple GRID detectors
  3. GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735)
  4. GRB 230709B: BALROG localization (Fermi Trigger 710614579 / GRB 230709706)
  5. IceCube-230708A: Upper limits from a search for additional neutrino events in IceCube
  6. IceCube-230707B: Upper limits from a search for additional neutrino events in IceCube
  7. IceCube-230707A: Upper limits from a search for additional neutrino events in IceCube
  8. Swift Trigger 1178410: possible GRB 230709A
  9. GRB 230628C: GRID Detection
  10. GRB 230707B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  11. GRB 230707A: Swift-XRT observations
  12. GRB 230707B: Fermi GBM Final Real-time Localization
  13. GRB 230707A: Fermi GBM Detection
  14. GRB 230707A: Swift ToO observations
  15. GRB 230707A: Swift/BAT-GUANO arcminute localization of a burst
  16. Fermi GRB 230707A: Global MASTER-Net observations report
  17. GRB 230707A: Fermi GBM Final Real-time Localization
  18. IBAS trigger number 10311: not a real GRB
  19. GRB 230625A: Detection by GRID
  20. LIGO/Virgo/KAGRA S230529ay: Updated Sky localization and EM Bright Classification
  21. GRB 230626A: VZLUSAT-2 detection
  22. LVK S230619bd/GBM-230619: Upper limits from a two-week IceCube neutrino search
  23. GRB 230328B: LBT detection of the likely host galaxy
  24. Konus-Wind detection of GRB 220623A
  25. GRB 230701B: AstroSat CZTI detection
  26. GRB 230628E: Swift/UVOT Detection
  27. GRB 230628E: Swift-BAT refined analysis
  28. GRB 230702A: Fermi GBM Final Real-time Localization
  29. GRB 230628E: ATCA rapid radio follow-up
  30. GRB 230701A: Fermi GBM Final Real-time Localization
  31. LIGO/Virgo/KAGRA S230627c: Upper limits from Swift/BAT-GUANO
  32. IPN triangulation of GRB 230625B (ultra-long)
  33. GRB 230625B: CALET Gamma-Ray Burst Monitor detection
  34. GRB 230628E - VLT spectroscopic observations
  35. Fermi GRB 230628C: Global MASTER-Net observations report
  36. GRB 230625B: AstroSat CZTI detection
  37. GRB230628E: VLT optical identification of afterglow candidate
  38. GRB 230628E: Swift-XRT refined Analysis
  39. GRB 230628E: Enhanced Swift-XRT position (Correction to name in GCN 34115)
  40. GRB 230628A: Enhanced Swift-XRT position
  41. Fermi GRB 230628D: Global MASTER-Net observations report
  42. GRB 230628E: LCOGT Optical Upper Limit
  43. GRB 230628E: Swift detection of a burst
  44. GRB 230628D: BALROG localization (Fermi Trigger 709676556 / GRB 230628849)
  45. GRB 230628D: Fermi GBM Final Real-time Localization
  46. GRB 230628C: Fermi GBM Final Real-time Localization
  47. GRB 230628B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  48. GRB 230623B: CALET Gamma-Ray Burst Monitor detection
  49. GRB 230628A: Fermi GBM Final Localization
  50. GRB 230626A: GRBAlpha detection
  51. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  52. LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations
  53. GRB230626A: Fermi GBM Detection
  54. Konus-Wind detection of GRB 230616A
  55. GRB 230618A: Swift-BAT refined analysis
  56. GRB 230625B: Swift/BAT-GUANO detection of a long burst
  57. GRB 230622A: Swift-BAT refined analysis
  58. GRB 230623A: Swift-XRT observations
  59. GRB 230625A: Fermi GBM Final Real-time Localization
  60. INTEGRAL upper limit on any GRB associated with ZTF23aaoohpy/AT2023lcr
  61. ATLAS23msn/ZTF23aaoohpy/AT2023lcr: Zeiss-1000 of Koshka observatory optical observations
  62. GRB 230623B: Swift/BAT-GUANO detection of a long burst outside the coded FOV 
  63. GRB 230623A: Tiled Swift observations
  64. MAXI GRB 230623A: MASTER optical observations
  65. GRB 230623A: Tiled Swift observations
  66. GRB 230622A: ATCA rapid radio follow-up
  67. GRB 230622A: Swift-XRT refined Analysis
  68. GRB 230623A: MAXI/GSC detection
  69. Swift GRB 230622A: Global MASTER-Net observations report
  70. Fermi GBM-230619: AstroSat CZTI non-detection and upper limits for the sub-threshold candidate
  71. GRB 230622A: Swift detection of a burst
  72. GRB 230621A: Fermi GBM Final Localization Correction
  73. Fermi GBM-230619: A soft subthreshold candidate potentially associated with a subthreshold LIGO/Virgo compact binary merger candidate
  74. ZTF23aaoohpy/AT2023lcr: Montarrenti Observatory optical observations
  75. ZTF23aaoohpy (AT2023lcr/ATLAS23msn): Upper limits from Konus-Wind observations
  76. ZTF23aaoohpy/AT2023lc: Mondy optical observations
  77. IPN triangulation of GRB 230616A (short)
  78. AT2023lcr (ATLAS23msn/ZTF23aaoohpy): Kinder observations with Lulin observatory and a probable plateau in the g-band light curve
  79. ZTF23aaoohpy/AT2023lcr: Keck/LRIS spectroscopy and redshift
  80. ZTF23aaoohpy/AT2023lcr: Liverpool Telescope detection
  81. GRB 230618A: Osservatorio Astronomico Nastro verde upper limit
  82. GRB 230618A: Enhanced Swift-XRT position
  83. GRB 230618A: Swift/UVOT Upper Limits
  84. GRB 230618A: Swift-XRT refined Analysis
  85. GRB 230616A: Swift-XRT observations
  86. GRB 230618A: KAIT Optical Observations
  87. Swift GRB 230618A: Global MASTER-Net observations report
  88. GRB230618A: LCOGT Optical Observations
  89. GRB 230618B: Fermi GBM Final Real-time Localization
  90. GRB 230618A: Prompt enhanced Swift-XRT position
  91. GRB 230618A: Swift detection of a burst
  92. GRB 230616A: Swift ToO observations
  93. GRB 230617A: Fermi GBM Final Real-time Localization
  94. GRB 230614C: GRBAlpha detection
  95. GRB 230616A: AstroSat CZTI detection
  96. GRB 230616A: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  97. GRB 230614C: AstroSat CZTI detection
  98. GRB 230614B: Fermi GBM Observation
  99. GRB 230614C: Fermi GBM Detection
  100. GRB 230614B: Swift/BAT-GUANO detection outside the coded FOV

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