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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"

24537 results found.

  1. GRB 231215B: Fermi GBM Final Real-time Localization
  2. GRB 231215A: Swift detection of a burst
  3. GRB 231214A: Fermi-LAT detection
  4. GRB 231214B: Swift/BAT-GUANO detection of a burst
  5. Fermi trigger No 724278269: Global MASTER-Net observations report
  6. Fermi trigger No 724233240: Global MASTER-Net observations report
  7. Swift GRB231214.85: Global MASTER-Net observations report
  8. GRB 231214A: Swift detection of a burst
  9. GRB 231214A: Fermi GBM Final Real-time Localization
  10. GRB 231210B: REM optical/NIR upper limits
  11. IceCube-231211A: Upper limits from a search for additional neutrino events in IceCube
  12. LIGO/Virgo/KAGRA S231213ap: Updated Sky localization
  13. LIGO/Virgo/KAGRA S231213ap: Identification of a GW compact binary merger candidate
  14. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 2047+098, located inside the IceCube-231211A error region
  15. IceCube-231211A - IceCube observation of a high-energy neutrino candidate track-like event
  16. LIGO/Virgo/KAGRA S231206cc: Upper limits from Swift/BAT-GUANO
  17. LIGO/Virgo/KAGRA S231206ca: Upper limits from Swift/BAT-GUANO
  18. GRB 231212A: GECAM-C detection of a likely short burst
  19. Fermi trigger No 724035412: Global MASTER-Net observations report
  20. GRB 231210B: Swift-BAT refined analysis
  21. IceCube Alert 231211.03: Global MASTER-Net observations report
  22. IceCube-231202A: No candidates from the Zwicky Transient Facility
  23. GRB 231210B: VLT/X-shooter redshift
  24. GRB 231210B: detection of the optical counterpart with the LCOGT 40cm telescope at Sutherland Observatory
  25. Fermi trigger No 723906955: Global MASTER-Net observations report
  26. GRB 231210B: Swift detection of a burst with optical counterpart
  27. Swift GRB231210.90: Global MASTER-Net OT detection
  28. Swift GRB231210.90: Global MASTER-Net observations report
  29. IPN triangulation of GRB 231129C
  30. GRB 231210A: Fermi GBM Final Real-time Localization
  31. GRB 231208A: GRBAlpha detection
  32. GRB 231208A: Glowbug gamma-ray detection
  33. LIGO/Virgo/KAGRA S231206ca: Updated Sky localization
  34. IPN triangulation of GRB 231205A
  35. GRB 231205B: Swift-BAT refined analysis
  36. GRB 231205B: 1.3m DFOT Optical upper limit
  37. LIGO/Virgo/KAGRA S231206cc: Updated Sky localization and Source Classification
  38. LIGO/Virgo/KAGRA S231206cc: Identification of a GW compact binary merger candidate
  39. LIGO/Virgo/KAGRA S231206ca: Identification of a GW compact binary merger candidate
  40. GRB231115A: TURBO Pre-Burst Optical Upper Limits
  41. Fermi trigger No 723581802: Global MASTER-Net observations report
  42. GRB 231206B: Fermi GBM Final Real-time Localization
  43. GRB 231205B: Ondrejov D50 optical upper limit
  44. Fermi-LAT gamma-ray observations of IceCube-231202A
  45. GRB 231205B: REM optical/NIR upper limits
  46. GRB 231129C: ASIM MXGS observation and localization
  47. GRB 231205B: NUTTelA-TAO / BSTI Early Optical Limits
  48. GRB 231205B: r'-band observations from MISTRAL at Observatoire de Haute-Provence
  49. GRB 231206A: GECAM-B detection of a short burst (correction)
  50. GRB 231205B : MITSuME Akeno optical upper limits
  51. GRB 231206A: GECAM-B detection of a short burst
  52. GRB 231205B: GECAM-B detection of a long burst
  53. GRB 231205B: LCOGT Optical Upper Limits
  54. LIGO/Virgo/KAGRA S231205c: One counterpart neutrino candidate event from an IceCube neutrino search
  55. Swift GRB231205.70: Global MASTER-Net observations report
  56. GRB 231204A: CALET Gamma-Ray Burst Monitor detection
  57. GRB 231205B: AKO Optical Upper Limit
  58. GRB 231205B: Swift detection of a burst
  59. GRB 231205A: GECAM-B detection of a short burst
  60. Fermi trigger No 723435916: Global MASTER-Net observations report
  61. Fermi trigger No 723326169: Global MASTER-Net observations report
  62. GRB 231205A: Fermi GBM Final Real-time Localization
  63. LIGO/Virgo/KAGRA S231129ac: Upper limits from Swift/BAT-GUANO
  64. IceCube-231202A: Upper limits from a search for additional neutrino events in IceCube
  65. Fermi trigger No 723412808: Global MASTER-Net observations report
  66. GRB 231203A: Fermi GBM Observation
  67. GRB 231204A: Fermi GBM Final Real-time Localization
  68. GRB 231203A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  69. Konus-Wind detection of GRB 231129C
  70. IceCube-231202A - IceCube observation of a high-energy neutrino candidate track-like event
  71. Fermi trigger No 723279695: Global MASTER-Net observations report
  72. The Fermi GBM team reports the detection of a likely SHORT GRB
  73. GRB 231203A: Fermi GBM Final Real-time Localization
  74. GRB 231129C: Swift-XRT afterglow detection
  75. Fermi trigger No 723149952: Global MASTER-Net observations report
  76. GRB 231129C: PROMPT optical upper limits for the MAXI/GSC X-ray counterpart and the MASTER afterglow candidate
  77. GRB 231129A: VZLUSAT-2 detection
  78. GRB 231129B: Swift-XRT observations
  79. GRB 231128A: VZLUSAT-2 detection
  80. GRB 231129C: AGILE detection
  81. GRB 231129A : MITSuME Akeno optical upper limits
  82. GRB 231129C: Swift/BAT-GUANO localization of a burst outside the coded FOV
  83. GRB 231129A: Swift-BAT refined analysis
  84. GRB 231129C: MASTER OT detection
  85. GRB 231129C: Fermi-LAT detection
  86. GRB 231129C: GRBAlpha detection
  87. GRB 231129C: Swift-XRT observations
  88. GRB 231129C: iTelescope OT retraction
  89. GRB 231129C: CALET Gamma-Ray Burst Monitor detection
  90. GRB 231129C: Fermi GBM Observation of a very bright GRB
  91. GRB 231127A: GRBAlpha detection
  92. GRB 231129C: BALROG localization (Fermi Trigger / GRB 231129799)
  93. GRB 231129C: Fermi GBM detection of a very bright burst
  94. LIGO/Virgo/KAGRA S231129ac: Updated Sky localization
  95. GRB 231129C: Fermi GBM Final Real-time Localization
  96. Fermi trigger No 722977823: Global MASTER-Net observations report
  97. Fermi-LAT gamma-ray observations of IceCube-231125A
  98. Integral GRB231129.21: Global MASTER-Net observations report
  99. LIGO/Virgo/KAGRA S231129ac: Identification of a GW compact binary merger candidate
  100. GRB 231129A: GECAM-C detection of a long burst

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