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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"

11848 results found.

  1. Fermi trigger No 596387570: Global MASTER-Net observations report
  2. Fermi-LAT Gamma-ray Observations of IceCube-191122A
  3. LIGO/Virgo S191124be: Global MASTER-Net observations report
  4. GRB 191123A: Swift-XRT refined Analysis
  5. GRB 191123A: Swift detection of a burst with an optical counterpart
  6. GRB 191122A: Swift-BAT refined analysis
  7. GRB 191122A: Swift-XRT refined Analysis
  8. IceCube-191119A: No significant detection in HAWC
  9. LIGO/Virgo S191120aj: Global MASTER-Net observations report
  10. IceCube-191119A: Upper limits from a search for additional neutrino events in IceCube
  11. Fermi-LAT Gamma-ray Observations of IceCube-191119A
  12. IceCube-191119A - No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  13. Swift Trigger 937114 is not an astrophysical source
  14. Swift GRB191115A: Global MASTER-Net observations report
  15. LIGO/Virgo S191110af: Upper limits from Konus-Wind observations
  16. Konus-Wind observation of the recent SGR 1935+2154 activity
  17. LIGO/Virgo S191110af: Swift XRT observations, no secure afterglow found
  18. LIGO/Virgo S191110af: Upper limits from IceCube MeV neutrino searches
  19. LIGO/Virgo S191110af: No counterpart candidates in Fermi-LAT observations
  20. LIGO/Virgo S191110af: Upper limits from Fermi-GBM Observations
  21. LIGO/Virgo S191110af: Coverage and upper limits from MAXI/GSC observations
  22. LIGO/Virgo S191109d: No significant candidates in FRAM-TAROT-GRANDMA observations
  23. LIGO/Virgo S191110x: Global MASTER-Net observations report
  24. LIGO/Virgo S191109d: No counterpart candidates in Fermi-LAT observations
  25. LIGO/Virgo S191105e: No significant candidates in FRAM-TAROT-GRANDMA observations
  26. LIGO/Virgo S191109d: AstroSat CZTI upper limits
  27. LIGO/Virgo S191109d: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  28. LIGO/Virgo S191109d: Coverage and upper limits from MAXI/GSC observations
  29. ZTF19abvizsw: Upper limits from Konus-Wind observations
  30. LIGO/Virgo S191105e: AstroSat CZTI upper limits
  31. LIGO/Virgo S191105e: No counterpart candidates in Fermi-LAT observations
  32. LIGO/Virgo S191105e: Coverage and upper limits from MAXI/GSC observations
  33. GRB 191106A: Swift-XRT refined Analysis
  34. LIGO/Virgo S191105e: No counterpart candidates in HAWC observations
  35. GRB 191106A: MASTER optical observation
  36. GRB 191106A: Swift detection of a burst
  37. Fermi trigger No 594592184: Global MASTER-Net observations report
  38. Swift GRB191105.01: Global MASTER-Net observations report
  39. GRB 191101A: Swift-BAT refined analysis
  40. Fermi GBM GRB 191104C (trigger 594592184 / 191104854) is not a GRB
  41. GRB 191104C: Fermi GBM Final Real-time Localization
  42. Fermi GBM GRBs 191104 A, B, C and triggers 594534420/191104185 and 594563923/191104527 are not GRBs
  43. Fermi trigger No 594563923: Global MASTER-Net observations report
  44. Fermi trigger No 594557071: Global MASTER-Net observations report
  45. Fermi GBM triggers 594523229/191104056 and 594528816/191104120 are not GRBs
  46. Konus-Wind observation of GRB 191031D: correction to GCN 26126
  47. GRB 191101A: Swift-XRT refined Analysis
  48. GRB 191101A: VIRT Optical Upper Limits
  49. Swift GRB191101.88: Global MASTER-Net observations report
  50. Fermi trigger No 594227699: Global MASTER-Net observations report
  51. GRB 191101A: Swift detection of a burst
  52. GRB 191031C: Swift-BAT refined analysis
  53. Konus-Wind observation of GRB 191031D
  54. GRB 191031D: Swift-XRT refined Analysis
  55. GRB 191031C: Fermi GBM detection
  56. GRB 191031C: Swift detection of a burst
  57. Konus-Wind observation of GRB 191027A
  58. GRB 191029A: CORRECTED Swift-XRT refined analysis
  59. GRB 191019A: Zadko Telescope optical observations
  60. GRB 191029A: Swift-XRT refined Analysis
  61. GRB 191028B: MASTER optical observation
  62. GRB 191029A: Swift-XRT observations
  63. Konus-Wind observation of GRB 191025B
  64. GRB 191029A: Swift detection of a burst
  65. GRB 191024A: Swift-XRT refined Analysis
  66. GRB191024A: MASTER optical observation
  67. GRB 191019A: Swift-XRT updated analysis
  68. Swift GRB191020.81: Global MASTER-Net OT detection
  69. GRB 191019A: Swift-BAT refined analysis
  70. GRB 191019A: GROND observations
  71. Fermi trigger No 593176520: Global MASTER-Net observations report
  72. Alert from the HAWC Burst Monitor HAWC-191019A
  73. FACT follow-up of ANTARES-Fermi 191011A
  74. GRB 191019A: Swift-XRT observations
  75. GRB 191017B: Swift-XRT refined Analysis
  76. GRB 191017C: Fermi GBM Final Real-time Localization
  77. GRB 191017B: Swift detection of a burst
  78. GRB 191016A: AZT-20 (Assy observatory) optical photometry
  79. Fermi trigger No 592818648: Global MASTER-Net observations report
  80. GRB 191011A: Swift-BAT refined analysis
  81. GRB 191011A: Swift-XRT refined Analysis
  82. Swift GRB191011.19: Global MASTER-Net observations report
  83. GRB 191011A: Swift detection of a burst with an optical counterpart
  84. TESS Detection of the Optical Emission from the Possible Untriggered GRB Associated with ZTF19abvizsw
  85. Konus-Wind observation of GRB 191004B
  86. Konus-Wind observation of GRB 191004A
  87. GRB 191004A: Optical Detection with LCO
  88. LIGO/Virgo S190930s: no counterpart candidate in the SVOM/GWAC observations
  89. LIGO/Virgo S190930t: Swift XRT observations, no secure afterglow found
  90. GRB 191004B: Swift-XRT refined Analysis
  91. GRB 191004A: Swift-XRT refined Analysis
  92. FACT follow-up of IceCube-191001A
  93. LIGO/Virgo S190930t: AT2019rpn, AT2019rpj CrAO continued optical photometry
  94. IceCube-191001A: HAWC follow-up
  95. GRB 190919A: AstroSat CZTI detection
  96. Fermi-LAT Gamma-ray Observations of IceCube-191001A
  97. LIGO/Virgo S190930t: AT2019rpn, AT2019rpj CrAO optical photometry
  98. LIGO/Virgo S190930t: Candidates from ATLAS observations and constraints on AT2019rpr and AT2019rpn
  99. GRB 191001A: RATIR Optical and NIR Observations
  100. LIGO/Virgo S190930t: Lulin Follow-up Observations of AT2019rpn and AT2019rpj

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