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"

37373 results found.

  1. IPN triangulation of GRB 230712C (short)
  2. IPN triangulation of GRB 230712A (short)
  3. GRB 230717A: Fermi GBM Final Real-time Localization
  4. GRB 230715A: Fermi GBM Final Real-time Localization
  5. Fermi GRB 230713A: Global MASTER-Net observations report
  6. GRB 230713A: Fermi GBM Final Real-time Localization
  7. GRB 230709B: CALET Gamma-Ray Burst Monitor detection
  8. GRB 230703A: CALET Gamma-Ray Burst Monitor detection
  9. GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  10. IceCube-230708A: Upper limits from Swift/BAT-GUANO
  11. GRB 230712B: Fermi GBM Final Localization
  12. GRB 230707A: Swift/BAT-GUANO position correction
  13. GRB 230712A: Fermi GBM Final Real-time Localization
  14. GRB 230709C: GRBAlpha detection
  15. GRB 230709B: GRBAlpha detection
  16. GRB 230709C: Fermi GBM Detection
  17. GRB 230709C: Fermi GBM Final Localization
  18. GRB 230707B: Fermi GBM Observation
  19. GRB 230710A: Fermi GBM Final Real-time Localization
  20. GRB 230709C: AstroSat CZTI detection
  21. GRB 230707B: CALET Gamma-Ray Burst Monitor detection
  22. GRB 230703A detected with multiple GRID detectors
  23. GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735)
  24. GRB 230709B: BALROG localization (Fermi Trigger 710614579 / GRB 230709706)
  25. Swift Trigger 1178410: possible GRB 230709A
  26. GRB 230628C: GRID Detection
  27. GRB 230707B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  28. GRB 230707A: Swift-XRT observations
  29. GRB 230707B: Fermi GBM Final Real-time Localization
  30. GRB 230707A: Fermi GBM Detection
  31. GRB 230707A: Swift ToO observations
  32. GRB 230707A: Swift/BAT-GUANO arcminute localization of a burst
  33. Fermi GRB 230707A: Global MASTER-Net observations report
  34. GRB 230707A: Fermi GBM Final Real-time Localization
  35. IBAS trigger number 10311: not a real GRB
  36. GRB 230625A: Detection by GRID
  37. GRB 230626A: VZLUSAT-2 detection
  38. GRB 230328B: LBT detection of the likely host galaxy
  39. Konus-Wind detection of GRB 220623A
  40. GRB 230701B: AstroSat CZTI detection
  41. GRB 230628E: Swift/UVOT Detection
  42. GRB 230628E: Swift-BAT refined analysis
  43. GRB 230702A: Fermi GBM Final Real-time Localization
  44. GRB 230628E: ATCA rapid radio follow-up
  45. GRB 230701A: Fermi GBM Final Real-time Localization
  46. LIGO/Virgo/KAGRA low-significance gravitational wave candidate S230701z: one counterpart neutrino candidate from IceCube neutrino searches
  47. LIGO/Virgo/KAGRA S230627c: Upper limits from Swift/BAT-GUANO
  48. IPN triangulation of GRB 230625B (ultra-long)
  49. GRB 230625B: CALET Gamma-Ray Burst Monitor detection
  50. GRB 230628E - VLT spectroscopic observations
  51. ZTF23aaoohpy/AT2023lcr: LBT observations
  52. Fermi GRB 230628C: Global MASTER-Net observations report
  53. GRB 230625B: AstroSat CZTI detection
  54. GRB230628E: VLT optical identification of afterglow candidate
  55. GRB 230628E: Swift-XRT refined Analysis
  56. GRB 230628E: Enhanced Swift-XRT position (Correction to name in GCN 34115)
  57. GRB 230628A: Enhanced Swift-XRT position
  58. Fermi GRB 230628D: Global MASTER-Net observations report
  59. GRB 230628E: LCOGT Optical Upper Limit
  60. GRB 230628E: Swift detection of a burst
  61. GRB 230628D: BALROG localization (Fermi Trigger 709676556 / GRB 230628849)
  62. GRB 230628D: Fermi GBM Final Real-time Localization
  63. LIGO/Virgo/KAGRA low-significance gravitational wave candidate S230628aj: one counterpart neutrino candidate from IceCube neutrino searches
  64. GRB 230628C: Fermi GBM Final Real-time Localization
  65. GRB 230628B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  66. GRB 230623B: CALET Gamma-Ray Burst Monitor detection
  67. GRB 230628A: Fermi GBM Final Localization
  68. GRB 230626A: GRBAlpha detection
  69. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  70. LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations
  71. GRB230626A: Fermi GBM Detection
  72. Konus-Wind detection of GRB 230616A
  73. LIGO/Virgo/KAGRA S230627c: Coverage and upper limits from MAXI/GSC observations
  74. GRB 230618A: Swift-BAT refined analysis
  75. GRB 230625B: Swift/BAT-GUANO detection of a long burst
  76. GRB 230622A: Swift-BAT refined analysis
  77. GRB 230623A: Swift-XRT observations
  78. GRB 230625A: Fermi GBM Final Real-time Localization
  79. INTEGRAL upper limit on any GRB associated with ZTF23aaoohpy/AT2023lcr
  80. ATLAS23msn/ZTF23aaoohpy/AT2023lcr: Zeiss-1000 of Koshka observatory optical observations
  81. GRB 230623B: Swift/BAT-GUANO detection of a long burst outside the coded FOV 
  82. GRB 230623A: Tiled Swift observations
  83. MAXI GRB 230623A: MASTER optical observations
  84. GRB 230623A: Tiled Swift observations
  85. GRB 230622A: ATCA rapid radio follow-up
  86. GRB 230622A: Swift-XRT refined Analysis
  87. GRB 230623A: MAXI/GSC detection
  88. Swift GRB 230622A: Global MASTER-Net observations report
  89. Fermi GBM-230619: AstroSat CZTI non-detection and upper limits for the sub-threshold candidate
  90. GRB 230622A: Swift detection of a burst
  91. GRB 230621A: Fermi GBM Final Localization Correction
  92. Fermi GBM-230619: A soft subthreshold candidate potentially associated with a subthreshold LIGO/Virgo compact binary merger candidate
  93. ZTF23aaoohpy/AT2023lcr: Montarrenti Observatory optical observations
  94. ZTF23aaoohpy (AT2023lcr/ATLAS23msn): Upper limits from Konus-Wind observations
  95. ZTF23aaoohpy/AT2023lc: Mondy optical observations
  96. IPN triangulation of GRB 230616A (short)
  97. LIGO/Virgo/KAGRA S230619bg: one counterpart neutrino candidate from IceCube neutrino searches
  98. AT2023lcr (ATLAS23msn/ZTF23aaoohpy): Kinder observations with Lulin observatory and a probable plateau in the g-band light curve
  99. ZTF23aaoohpy/AT2023lcr: Keck/LRIS spectroscopy and redshift
  100. ZTF23aaoohpy/AT2023lcr: Liverpool Telescope 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