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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"

11853 results found.

  1. Konus-Wind observation of GRB 200219A
  2. LIGO/Virgo S200219ac: Upper limits from Konus-Wind observations
  3. LIGO/Virgo S200213t: Upper limits from Konus-Wind observations
  4. LIGO/Virgo S200208q: Upper limits from Konus-Wind observations
  5. LIGO/Virgo S200225q: no counterpart candidate in SVOM/GWAC observations
  6. LIGO/Virgo S200224ca: No counterpart candidates in KAIT observations
  7. LIGO/Virgo S200224ca: GRAWITA-Campo Imperatore observations.
  8. Fermi trigger No 604231129: Global MASTER-Net observations report
  9. LIGO/Virgo S200225q: No counterpart candidates in Fermi-LAT observations
  10. LIGO/Virgo S200225q: No counterpart candidates in HAWC observations
  11. LIGO/Virgo S200225q: Global MASTER-Net observations report
  12. LIGO/Virgo S200224ca: No counterpart candidates in Fermi-LAT observations
  13. LIGO/Virgo S200225q: Coverage and upper limits from MAXI/GSC observations
  14. LIGO/Virgo S200224ca: Coverage and upper limits from MAXI/GSC observations
  15. GRB 200224A: Swift-XRT refined Analysis
  16. Fermi trigger No 604213554: Global MASTER-Net observations report
  17. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC-F30 observations
  18. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC observations
  19. LIGO/Virgo S200219ac : No significant candidates in TAROT - FRAM - GRANDMA observations.
  20. GRB 200219A: FRAM-Auger optical limit
  21. GRB 200219C: Mondy and TSHAO optical observations
  22. GRB 200219C: Nanshan/NEXT optical upper limit and possible host galaxy from PanSTARRS
  23. LIGO/Virgo S200219ac: No counterpart candidates in KAIT observations
  24. GRB 200219C: DDOTI Observations
  25. LIGO/Virgo S200213t: AT2020clw/ZTF20aanaoyz, AT2020crd/ZTF20aanakge and AT2020cly/ZTF20aanakes 10.4m GTC spectroscopy
  26. LIGO/Virgo S200213t: Swift UVOT and XRT observations of ZTF20aamvmzj (AT2020cja)
  27. GRB 200219C: Fermi-LAT detection
  28. GRB 200219A, Swift-BAT refined analysis
  29. Fermi trigger No 603849435: Global MASTER-Net observations report
  30. LIGO/Virgo S200219ac: No counterpart candidates in Fermi-LAT observations
  31. GRB 200219A: Swift-XRT refined Analysis correction
  32. LIGO/Virgo S200219ac: No counterpart candidates in HAWC observations
  33. LIGO/Virgo S200219ac: Coverage and upper limits from MAXI/GSC observations
  34. GRB 200219A: Swift detection of a short burst
  35. Swift GRB200219.32: Global MASTER-Net observations report
  36. GRB 200216B: Mondy and AbAO optical upper limits
  37. GRB 200216B: Swift-XRT refined Analysis
  38. LIGO/Virgo S200213t : No significant candidates in FRAM - OAJ - TAROT - GRANDMA observations
  39. LIGO/Virgo S200213t: AstroSat CZTI upper limits
  40. GRB 200216B: Swift detection of a burst
  41. Swift GRB200216.56: Global MASTER-Net observations report
  42. LIGO/Virgo S200213t: Updated coverage and candidate list for the Zwicky Transient Facility
  43. LIGO/Virgo S200213t: CLU/NED Galaxies in the 4-Update Localization Volume
  44. LIGO/Virgo S200213t: Possible host galaxies in the bilby skymap
  45. GRB 200215A: Liverpool Telescope upper limits
  46. Swift GRB200215.61: Global MASTER-Net observations report
  47. GRB 200215A: Swift detection of a burst
  48. LIGO/Virgo S200213t: MASTER possible Kilonova candidate in PGC315337
  49. LIGO/Virgo S200213t: No counterpart candidates from Nanshan-0.6m observations
  50. LIGO/Virgo S200213t: More Candidates from the Zwicky Transient Facility
  51. LIGO/Virgo S200213t: No counterpart candidates in KAIT observations
  52. LIGO/Virgo S200213t: AT2020ciz/ZTF20aamvnat, AT2020cjb/ZTF20aamvnth and 2020cjf/ZTF20aamvodd 10.4m GTC spectroscopy
  53. LIGO/Virgo S200213t: No counterpart candidates in Fermi-LAT observations
  54. LIGO/Virgo S200213t: No Counterparts in DDOTI/OAN Optical Observations
  55. LIGO/Virgo S200213t: AT2020ciy/ZTF20aamvqxl, AT2020cjg/ZTF20aamvoxx and AT2020cje/ZTF20aamvtip 10.4m GTC spectroscopy
  56. LIGO/Virgo S200213t: MANGROVE catalog galaxy ranking
  57. LIGO/Virgo S191213g: AT2019wxt Wendelstein optical observations
  58. LIGO/Virgo S200208q : No significant candidates in TAROT - FRAM - GRANDMA observations
  59. LIGO/Virgo S200213t: Coverage and upper limits from MAXI/GSC observations
  60. LIGO/Virgo trigger S200213t: Possible host galaxies
  61. LIGO/Virgo S200213t: NED Galaxies in the 90% Localization Volume
  62. ZTF20aajnksq: Upper limits from Konus-Wind observations
  63. GRB 200131A: Tautenburg observations
  64. Konus-Wind observation of GRB 200205B
  65. LIGO/Virgo S200208q: No counterpart candidates in KAIT observations
  66. LIGO/Virgo S200208q: No counterpart candidates in Fermi-LAT observations
  67. GRB 200120A: Fermi GBM observation
  68. LIGO/Virgo S200208q: Coverage and upper limits from MAXI/GSC observations
  69. LIGO/Virgo S200208q: No counterpart candidates in HAWC observations
  70. Fermi trigger No 602817262: Global MASTER-Net observations report
  71. GRB 200205B: Swift-BAT refined analysis
  72. Fermi trigger No 602731380: Global MASTER-Net observations report
  73. GRB 200205B: Swift-XRT refined Analysis
  74. GRB 200205B: LCO Optical Detection
  75. GRB 200205C: Fermi GBM Final Real-time Localization
  76. GRB 200205B: Swift detection of a burst with optical counterpart
  77. Swift GRB200205.81: Global MASTER-Net observations report
  78. MeerKAT observation of GRB 191221B
  79. GRB 200205A: MAXI/GSC detection
  80. MAXI GRB200205.29: Global MASTER-Net observations report
  81. Re-classification of Fermi GBM triggers 200203137, 200203156/GRB200203A and 200203861
  82. LIGO/Virgo S200129m: Upper limits from Konus-Wind observations
  83. LIGO/Virgo S200128d: Upper limits from Konus-Wind observations
  84. Konus-Wind observation of GRB 200131A
  85. GRB 200131A: VIRT optical transient detection
  86. GRB 200201A: Fermi GBM Final Real-time Localization
  87. Swift GRB200131.95: Global MASTER-Net observations report
  88. Konus-Wind observation of GRB 200125B
  89. Konus-Wind observation of GRB 200130B
  90. IPN triangulation of GRB 200130B
  91. LIGO/Virgo S200128d: no counterpart candidate in SVOM/GWAC observations
  92. LIGO/Virgo S200128d : No significant candidates in FRAM - TAROT - GRANDMA observations
  93. LIGO/Virgo S200129m: NED Galaxies in the 50% Localization Volume
  94. LIGO/Virgo S200129m: No counterpart candidates in Fermi-LAT observations
  95. Konus-Wind observation of GRB 200125A
  96. LIGO/Virgo S200128d: upper limits from AGILE/GRID observations
  97. LIGO/Virgo S200129m: Coverage and upper limits from MAXI/GSC observations
  98. LIGO/Virgo S200128d: No counterpart candidates in Fermi-LAT observations
  99. LIGO/Virgo S200128d: Upper limits from CALET observations
  100. LIGO/Virgo S200128d: No counterpart candidates in KAIT observations

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