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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"

24539 results found.

  1. GRB 231215A : MITSuME Akeno optical afterglow candidate detection
  2. Swift GRB231215.41: Global MASTER-Net observations report
  3. GRB 231215B: Fermi GBM Final Real-time Localization
  4. GRB 231215A: Swift detection of a burst
  5. GRB 231214A: Fermi-LAT detection
  6. GRB 231214B: Swift/BAT-GUANO detection of a burst
  7. Fermi trigger No 724278269: Global MASTER-Net observations report
  8. Fermi trigger No 724233240: Global MASTER-Net observations report
  9. Swift GRB231214.85: Global MASTER-Net observations report
  10. GRB 231214A: Swift detection of a burst
  11. GRB 231214A: Fermi GBM Final Real-time Localization
  12. GRB 231210B: REM optical/NIR upper limits
  13. IceCube-231211A: Upper limits from a search for additional neutrino events in IceCube
  14. LIGO/Virgo/KAGRA S231213ap: Updated Sky localization
  15. LIGO/Virgo/KAGRA S231213ap: Identification of a GW compact binary merger candidate
  16. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 2047+098, located inside the IceCube-231211A error region
  17. IceCube-231211A - IceCube observation of a high-energy neutrino candidate track-like event
  18. LIGO/Virgo/KAGRA S231206cc: Upper limits from Swift/BAT-GUANO
  19. LIGO/Virgo/KAGRA S231206ca: Upper limits from Swift/BAT-GUANO
  20. GRB 231212A: GECAM-C detection of a likely short burst
  21. Fermi trigger No 724035412: Global MASTER-Net observations report
  22. GRB 231210B: Swift-BAT refined analysis
  23. IceCube Alert 231211.03: Global MASTER-Net observations report
  24. IceCube-231202A: No candidates from the Zwicky Transient Facility
  25. GRB 231210B: VLT/X-shooter redshift
  26. GRB 231210B: detection of the optical counterpart with the LCOGT 40cm telescope at Sutherland Observatory
  27. Fermi trigger No 723906955: Global MASTER-Net observations report
  28. GRB 231210B: Swift detection of a burst with optical counterpart
  29. Swift GRB231210.90: Global MASTER-Net OT detection
  30. Swift GRB231210.90: Global MASTER-Net observations report
  31. IPN triangulation of GRB 231129C
  32. GRB 231210A: Fermi GBM Final Real-time Localization
  33. GRB 231208A: GRBAlpha detection
  34. GRB 231208A: Glowbug gamma-ray detection
  35. LIGO/Virgo/KAGRA S231206ca: Updated Sky localization
  36. IPN triangulation of GRB 231205A
  37. GRB 231205B: Swift-BAT refined analysis
  38. GRB 231205B: 1.3m DFOT Optical upper limit
  39. LIGO/Virgo/KAGRA S231206cc: Updated Sky localization and Source Classification
  40. LIGO/Virgo/KAGRA S231206cc: Identification of a GW compact binary merger candidate
  41. LIGO/Virgo/KAGRA S231206ca: Identification of a GW compact binary merger candidate
  42. GRB231115A: TURBO Pre-Burst Optical Upper Limits
  43. Fermi trigger No 723581802: Global MASTER-Net observations report
  44. GRB 231206B: Fermi GBM Final Real-time Localization
  45. GRB 231205B: Ondrejov D50 optical upper limit
  46. Fermi-LAT gamma-ray observations of IceCube-231202A
  47. GRB 231205B: REM optical/NIR upper limits
  48. GRB 231129C: ASIM MXGS observation and localization
  49. GRB 231205B: NUTTelA-TAO / BSTI Early Optical Limits
  50. GRB 231205B: r'-band observations from MISTRAL at Observatoire de Haute-Provence
  51. GRB 231206A: GECAM-B detection of a short burst (correction)
  52. GRB 231205B : MITSuME Akeno optical upper limits
  53. GRB 231206A: GECAM-B detection of a short burst
  54. GRB 231205B: GECAM-B detection of a long burst
  55. GRB 231205B: LCOGT Optical Upper Limits
  56. LIGO/Virgo/KAGRA S231205c: One counterpart neutrino candidate event from an IceCube neutrino search
  57. Swift GRB231205.70: Global MASTER-Net observations report
  58. GRB 231204A: CALET Gamma-Ray Burst Monitor detection
  59. GRB 231205B: AKO Optical Upper Limit
  60. GRB 231205B: Swift detection of a burst
  61. GRB 231205A: GECAM-B detection of a short burst
  62. Fermi trigger No 723435916: Global MASTER-Net observations report
  63. Fermi trigger No 723326169: Global MASTER-Net observations report
  64. GRB 231205A: Fermi GBM Final Real-time Localization
  65. LIGO/Virgo/KAGRA S231129ac: Upper limits from Swift/BAT-GUANO
  66. IceCube-231202A: Upper limits from a search for additional neutrino events in IceCube
  67. Fermi trigger No 723412808: Global MASTER-Net observations report
  68. GRB 231203A: Fermi GBM Observation
  69. GRB 231204A: Fermi GBM Final Real-time Localization
  70. GRB 231203A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  71. Konus-Wind detection of GRB 231129C
  72. IceCube-231202A - IceCube observation of a high-energy neutrino candidate track-like event
  73. Fermi trigger No 723279695: Global MASTER-Net observations report
  74. The Fermi GBM team reports the detection of a likely SHORT GRB
  75. GRB 231203A: Fermi GBM Final Real-time Localization
  76. GRB 231129C: Swift-XRT afterglow detection
  77. Fermi trigger No 723149952: Global MASTER-Net observations report
  78. GRB 231129C: PROMPT optical upper limits for the MAXI/GSC X-ray counterpart and the MASTER afterglow candidate
  79. GRB 231129A: VZLUSAT-2 detection
  80. GRB 231129B: Swift-XRT observations
  81. GRB 231128A: VZLUSAT-2 detection
  82. GRB 231129C: AGILE detection
  83. GRB 231129A : MITSuME Akeno optical upper limits
  84. GRB 231129C: Swift/BAT-GUANO localization of a burst outside the coded FOV
  85. GRB 231129A: Swift-BAT refined analysis
  86. GRB 231129C: MASTER OT detection
  87. GRB 231129C: Fermi-LAT detection
  88. GRB 231129C: GRBAlpha detection
  89. GRB 231129C: Swift-XRT observations
  90. GRB 231129C: iTelescope OT retraction
  91. GRB 231129C: CALET Gamma-Ray Burst Monitor detection
  92. GRB 231129C: Fermi GBM Observation of a very bright GRB
  93. GRB 231127A: GRBAlpha detection
  94. GRB 231129C: BALROG localization (Fermi Trigger / GRB 231129799)
  95. GRB 231129C: Fermi GBM detection of a very bright burst
  96. LIGO/Virgo/KAGRA S231129ac: Updated Sky localization
  97. GRB 231129C: Fermi GBM Final Real-time Localization
  98. Fermi trigger No 722977823: Global MASTER-Net observations report
  99. Fermi-LAT gamma-ray observations of IceCube-231125A
  100. Integral GRB231129.21: Global MASTER-Net observations report

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