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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"

36214 results found.

  1. Fermi GRB 230713A: Global MASTER-Net observations report
  2. GRB 230713A: Fermi GBM Final Real-time Localization
  3. GRB 230709B: CALET Gamma-Ray Burst Monitor detection
  4. GRB 230703A: CALET Gamma-Ray Burst Monitor detection
  5. GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  6. IceCube-230708A: Upper limits from Swift/BAT-GUANO
  7. GRB 230712B: Fermi GBM Final Localization
  8. GRB 230707A: Swift/BAT-GUANO position correction
  9. GRB 230712A: Fermi GBM Final Real-time Localization
  10. GRB 230709C: GRBAlpha detection
  11. GRB 230709B: GRBAlpha detection
  12. GRB 230709C: Fermi GBM Detection
  13. GRB 230709C: Fermi GBM Final Localization
  14. GRB 230707B: Fermi GBM Observation
  15. GRB 230710A: Fermi GBM Final Real-time Localization
  16. GRB 230709C: AstroSat CZTI detection
  17. GRB 230707B: CALET Gamma-Ray Burst Monitor detection
  18. GRB 230703A detected with multiple GRID detectors
  19. GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735)
  20. GRB 230709B: BALROG localization (Fermi Trigger 710614579 / GRB 230709706)
  21. IceCube-230708A: Upper limits from a search for additional neutrino events in IceCube
  22. IceCube-230707B: Upper limits from a search for additional neutrino events in IceCube
  23. IceCube-230707A: Upper limits from a search for additional neutrino events in IceCube
  24. Swift Trigger 1178410: possible GRB 230709A
  25. GRB 230628C: GRID Detection
  26. GRB 230707B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  27. GRB 230707A: Swift-XRT observations
  28. GRB 230707B: Fermi GBM Final Real-time Localization
  29. GRB 230707A: Fermi GBM Detection
  30. GRB 230707A: Swift ToO observations
  31. GRB 230707A: Swift/BAT-GUANO arcminute localization of a burst
  32. Fermi GRB 230707A: Global MASTER-Net observations report
  33. GRB 230707A: Fermi GBM Final Real-time Localization
  34. IBAS trigger number 10311: not a real GRB
  35. GRB 230625A: Detection by GRID
  36. LIGO/Virgo/KAGRA S230529ay: Updated Sky localization and EM Bright Classification
  37. GRB 230626A: VZLUSAT-2 detection
  38. LVK S230619bd/GBM-230619: Upper limits from a two-week IceCube neutrino search
  39. GRB 230328B: LBT detection of the likely host galaxy
  40. Konus-Wind detection of GRB 220623A
  41. GRB 230701B: AstroSat CZTI detection
  42. GRB 230628E: Swift/UVOT Detection
  43. GRB 230628E: Swift-BAT refined analysis
  44. GRB 230702A: Fermi GBM Final Real-time Localization
  45. GRB 230628E: ATCA rapid radio follow-up
  46. GRB 230701A: Fermi GBM Final Real-time Localization
  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. Fermi GRB 230628C: Global MASTER-Net observations report
  52. GRB 230625B: AstroSat CZTI detection
  53. GRB230628E: VLT optical identification of afterglow candidate
  54. GRB 230628E: Swift-XRT refined Analysis
  55. GRB 230628E: Enhanced Swift-XRT position (Correction to name in GCN 34115)
  56. GRB 230628A: Enhanced Swift-XRT position
  57. Fermi GRB 230628D: Global MASTER-Net observations report
  58. GRB 230628E: LCOGT Optical Upper Limit
  59. GRB 230628E: Swift detection of a burst
  60. GRB 230628D: BALROG localization (Fermi Trigger 709676556 / GRB 230628849)
  61. GRB 230628D: Fermi GBM Final Real-time Localization
  62. GRB 230628C: Fermi GBM Final Real-time Localization
  63. GRB 230628B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  64. GRB 230623B: CALET Gamma-Ray Burst Monitor detection
  65. GRB 230628A: Fermi GBM Final Localization
  66. GRB 230626A: GRBAlpha detection
  67. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  68. LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations
  69. GRB230626A: Fermi GBM Detection
  70. Konus-Wind detection of GRB 230616A
  71. GRB 230618A: Swift-BAT refined analysis
  72. GRB 230625B: Swift/BAT-GUANO detection of a long burst
  73. GRB 230622A: Swift-BAT refined analysis
  74. GRB 230623A: Swift-XRT observations
  75. GRB 230625A: Fermi GBM Final Real-time Localization
  76. INTEGRAL upper limit on any GRB associated with ZTF23aaoohpy/AT2023lcr
  77. ATLAS23msn/ZTF23aaoohpy/AT2023lcr: Zeiss-1000 of Koshka observatory optical observations
  78. GRB 230623B: Swift/BAT-GUANO detection of a long burst outside the coded FOV 
  79. GRB 230623A: Tiled Swift observations
  80. MAXI GRB 230623A: MASTER optical observations
  81. GRB 230623A: Tiled Swift observations
  82. GRB 230622A: ATCA rapid radio follow-up
  83. GRB 230622A: Swift-XRT refined Analysis
  84. GRB 230623A: MAXI/GSC detection
  85. Swift GRB 230622A: Global MASTER-Net observations report
  86. Fermi GBM-230619: AstroSat CZTI non-detection and upper limits for the sub-threshold candidate
  87. GRB 230622A: Swift detection of a burst
  88. GRB 230621A: Fermi GBM Final Localization Correction
  89. Fermi GBM-230619: A soft subthreshold candidate potentially associated with a subthreshold LIGO/Virgo compact binary merger candidate
  90. ZTF23aaoohpy/AT2023lcr: Montarrenti Observatory optical observations
  91. ZTF23aaoohpy (AT2023lcr/ATLAS23msn): Upper limits from Konus-Wind observations
  92. ZTF23aaoohpy/AT2023lc: Mondy optical observations
  93. IPN triangulation of GRB 230616A (short)
  94. AT2023lcr (ATLAS23msn/ZTF23aaoohpy): Kinder observations with Lulin observatory and a probable plateau in the g-band light curve
  95. ZTF23aaoohpy/AT2023lcr: Keck/LRIS spectroscopy and redshift
  96. ZTF23aaoohpy/AT2023lcr: Liverpool Telescope detection
  97. GRB 230618A: Osservatorio Astronomico Nastro verde upper limit
  98. GRB 230618A: Enhanced Swift-XRT position
  99. GRB 230618A: Swift/UVOT Upper Limits
  100. GRB 230618A: Swift-XRT refined Analysis

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