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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"

5183 results found.

  1. LIGO/Virgo S200225q: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  2. LIGO/Virgo S200224ca: upper limits from AGILE/GRID observations
  3. GRB 200224A: LCO Upper Limits
  4. LIGO/Virgo S200224ca: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  5. LIGO/Virgo S200224ca: Coverage and upper limits from MAXI/GSC observations
  6. LIGO/Virgo S200224ca: upper limits from AGILE/MCAL observations
  7. LIGO/Virgo S200224ca: Global MASTER-Net observations report
  8. LIGO/Virgo S200224ca: Upper limits from IceCube neutrino searches
  9. LIGO/Virgo S200224ca: Identification of a GW compact binary merger candidate The LIGO Scientific Collaboration and the Virgo Collaboration
  10. Correction in name: GRB 200224B and GRB 200224C (not GRB 200224A)
  11. GRB 200224A: Swift-XRT refined Analysis
  12. GRB 200224C: Fermi GBM Final Real-time Localization
  13. GRB 200224A: Tautenburg observations
  14. Fermi trigger No 604213554: Global MASTER-Net observations report
  15. GRB 200224B: Fermi GBM Final Real-time Localization
  16. GRB 200224A: Swift detection of a burst
  17. Swift GRB200224.14: Global MASTER-Net observations report
  18. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC-F30 observations
  19. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC observations
  20. LIGO/Virgo S200219ac : No significant candidates in TAROT - FRAM - GRANDMA observations.
  21. LIGO/Virgo S200219ac: No counterpart candidates in KAIT observations
  22. GRB 200219C: Fermi GBM Final Real-time Localization
  23. GRB 200219A: Swift-XRT refined Analysis correction
  24. GRB 200216B: Swift-XRT refined Analysis
  25. LIGO/Virgo S200213t : No significant candidates in FRAM - OAJ - TAROT - GRANDMA observations
  26. GRB 200216A: Swift/BAT detection and arcminute localization from GUANO
  27. GRB 200215A: Swift-XRT refined Analysis
  28. GRB 200215A: Fermi GBM detection
  29. LIGO/Virgo S200213t: No neutrino candidates at Pierre Auger Observatory
  30. LIGO/Virgo S200213t: No counterpart candidates in KAIT observations
  31. LIGO/Virgo S200213t: No Counterparts in DDOTI/OAN Optical Observations
  32. LIGO/Virgo S200208q : No significant candidates in TAROT - FRAM - GRANDMA observations
  33. LIGO/Virgo trigger S200213t: Possible host galaxies
  34. LIGO/Virgo S200208q: No counterpart candidates in KAIT observations
  35. Fermi trigger No 602817262: Global MASTER-Net observations report
  36. GRB 200205B: Swift-XRT refined Analysis
  37. GRB 200205A: MAXI/GSC detection
  38. MAXI GRB200205.29: Global MASTER-Net observations report
  39. Swift GRB 200205A: Global MASTER-Net observations report
  40. Fermi trigger No 602455182: Global MASTER-Net observations report
  41. ZTF Discovery of ZTF20aajnksq: a Rapidly Fading Luminous Transient in the GRB 200128A Localiziation Region
  42. LIGO/Virgo S200128d: no counterpart candidate in SVOM/GWAC observations
  43. LIGO/Virgo S200128d : No significant candidates in FRAM - TAROT - GRANDMA observations
  44. LIGO/Virgo S200128d: No counterpart candidates in KAIT observations
  45. GRB 200127A: Swift-XRT refined Analysis
  46. Fermi trigger No 601841483: Global MASTER-Net observations report
  47. Fermi trigger No 601729856: Global MASTER-Net observations report
  48. Fermi trigger No 601677816: Global MASTER-Net observations report
  49. Correction to GRB 200125A: Swift-XRT refined analysis
  50. LIGO/Virgo S200114f : No significant candidates in TAROT - FRAM - GRANDMA observations
  51. Fermi trigger No 601363105: Global MASTER-Net observations report
  52. LIGO/Virgo S200115j: Further Swift-XRT sources
  53. GRB 200122A: Swift-XRT refined Analysis
  54. Fermi trigger No 601254300: Global MASTER-Net observations report
  55. LIGO/Virgo S200105ae: Upper limits from Konus-Wind observations
  56. LIGO/Virgo S200115j: No counterpart detection within possible host galaxies observed by the GRAWITA-Savelli telescope
  57. LIGO/Virgo S200115j : No significant candidates in TAROT - FRAM - GRANDMA observations
  58. GRB 200115A: AROMA-N Optical Observation
  59. GRB 200117A: Fermi GBM Final Real-time Localization
  60. IceCube Alert 200117.46: Global MASTER-Net observations report
  61. LIGO/Virgo S200115j: Swift-XRT sources
  62. LIGO/Virgo S200112r : No significant candidates in TAROT - FRAM - GRANDMA observations.
  63. LIGO/Virgo S200115j: No neutrino candidates at Pierre Auger Observatory
  64. LIGO/Virgo S200114f: Swift-XRT sources and observations
  65. LIGO/Virgo S200115j: no counterpart candidate in SVOM/GWAC observations
  66. Baksan Neutrino Observatory Alert 200116.22: Global MASTER-Net observations report
  67. LIGO/Virgo S200115j: INTEGRAL was inactive at the time of the event
  68. LIGO/Virgo trigger S200115j: Possible host galaxies
  69. LIGO/Virgo S200114f: SAGUARO previous detection of ZTF candidate ZTF20aafeaqk (AT2020vx)
  70. IceCube-200109A: Candidate Counterparts from the Zwicky Transient Facility
  71. LIGO/Virgo S200114f: Candidates from the Zwicky Transient Facility
  72. Fermi trigger No 600666048: Global MASTER-Net observations report
  73. GRB 200112A: Fermi GBM Final Real-time Localization
  74. LIGO/Virgo S200105ae : No significant candidates in TAROT - FRAM - GRANDMA observations.
  75. Fermi-LAT ANTARES coincidence /ANTARES alert 200108.39: MASTER alert and inspect observation
  76. GRB 200109A: Swift-XRT refined Analysis
  77. IceCube-200107A: No significant detection in HAWC
  78. IceCube-200107A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  79. LIGO/Virgo S200105ae: Upper limits from CALET observations.
  80. GRB 200107B: Swift detection of a burst
  81. LIGO/Virgo S200105ae: Further study ongoing for GW compact binary merger candidate
  82. LIGO/Virgo 200105ae: No counterpart candidates in Fermi-LAT observations
  83. LIGO/Virgo S200105ae: AstroSat CZTI upper limits
  84. LIGO/Virgo S200105ae: Coverage and upper limits from MAXI/GSC observations
  85. LIGO/Virgo S200105ae: no counterpart candidates in the Swift/BAT observations
  86. LIGO/Virgo S200105ae: not observable by AGILE-MCAL
  87. LIGO/Virgo S200105ae: Global MASTER-Net observations report
  88. LIGO/Virgo S200105ae: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  89. LIGO/Virgo S200105ae : no neutrino counterpart candidate in ANTARES search
  90. LIGO/Virgo S200105ae: A subthreshold GW compact binary merger candidate
  91. Fermi trigger No 599954133: Global MASTER-Net observations report
  92. IceCube Alert 200101.46: Global MASTER-Net observations report
  93. GRB 191228A: Swift-XRT refined Analysis
  94. GRB 191227A: Fermi GBM Final Real-time Localization
  95. LIGO/Virgo S191213g: AT2019wxt 10.4m GTC further spectroscopy
  96. LIGO/Virgo S191205ah: MASTER OT detection
  97. LIGO/Virgo S191222n : No significant candidates in FRAM-TAROT-GRANDMA observations
  98. LIGO/Virgo S191222n: no counterpart candidate in SVOM/GWAC observations
  99. LIGO/Virgo S191216ap: No significant candidates found in Pan-STARRS observations
  100. GRB 191221B: Swift-XRT refined Analysis

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