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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"

36348 results found.

  1. GRB 231215A: Swift/UVOT Detection
  2. GRB 231215A: Swift-XRT refined Analysis
  3. GRB 231215A: BOOTES-4/MET optical detection
  4. GRB 231215A: AKO Optical Upper Limit
  5. GRB 231215A: AGILE detection
  6. GRB 231214A: Fermi GBM observation
  7. Konus-Wind detection of GRB 231210B
  8. ATCA observations of GRB 231210B
  9. GRB 231215A: Enhanced Swift-XRT position
  10. GRB 231214A: REM optical/NIR upper limits
  11. GRB 231215A: GROWTH-India optical follow-up
  12. GRB 231215A : Nanshan/HMT optical observations
  13. GRB 231215A: AstroSat CZTI detection
  14. GRB 231215A : MITSuME Akeno optical afterglow candidate detection
  15. GRB 231214A: Swift-XRT refined Analysis
  16. GRB 231215A: Mondy optical bright afterglow detection
  17. GRB 231214A: AstroSat CZTI detection
  18. GRB 231215C: MASTER OT detection
  19. GRB 231215A: Swift-XRT observations
  20. GRB 231215B: Fermi GBM Final Real-time Localization
  21. GRB 231215A: Swift detection of a burst
  22. GRB 231214A: Fermi-LAT detection
  23. GRB 231214A: Enhanced Swift-XRT position
  24. GRB 231214B: Swift/BAT-GUANO detection of a burst
  25. GRB231214A: BOOTES-6/DPRT optical upper limit
  26. GRB 231214A: Swift detection of a burst
  27. GRB 231214A: Fermi GBM Final Real-time Localization
  28. GRB 231210B: REM optical/NIR upper limits
  29. IceCube-231211A: Upper limits from a search for additional neutrino events in IceCube
  30. LIGO/Virgo/KAGRA S231206cc: Upper limits from Swift/BAT-GUANO
  31. LIGO/Virgo/KAGRA S231206ca: Upper limits from Swift/BAT-GUANO
  32. GRB 231212A: GECAM-C detection of a likely short burst
  33. GRB 231210B: MeerLICHT afterglow observations
  34. GRB 231210B: Swift-BAT refined analysis
  35. GRB 231210B: Swift-XRT refined Analysis
  36. GRB 231210B: Enhanced Swift-XRT position
  37. GRB 231210B: VLT/X-shooter redshift
  38. GRB 231210B: detection of the optical counterpart with the LCOGT 40cm telescope at Sutherland Observatory
  39. GRB 231210B: Swift detection of a burst with optical counterpart
  40. IPN triangulation of GRB 231129C
  41. GRB 231210A: Fermi GBM Final Real-time Localization
  42. GRB 231208A: GRBAlpha detection
  43. GRB231205B: Swift/UVOT Upper Limits
  44. GRB 231208A: Glowbug gamma-ray detection
  45. GRB 231208A: AstroSat CZTI detection of a faint burst
  46. IPN triangulation of GRB 231205A
  47. GRB 231205B: Swift-BAT refined analysis
  48. GRB 231205B: 1.3m DFOT Optical upper limit
  49. GRB 231206A: joint location of multiple instruments by ETJASMIN
  50. GRB 231205B: optical upper limit in TSHAOand AbAO
  51. GRB231115A: TURBO Pre-Burst Optical Upper Limits
  52. GRB 231205B: AGILE detection
  53. GRB 231206B: Fermi GBM Final Real-time Localization
  54. GRB 231205B: Ondrejov D50 optical upper limit
  55. GRB 231205B: Swift-XRT refined Analysis
  56. GRB 231205B: REM optical/NIR upper limits
  57. GRB 231129C: ASIM MXGS observation and localization
  58. GRB 231205B: NUTTelA-TAO / BSTI Early Optical Limits
  59. GRB 231205B: r'-band observations from MISTRAL at Observatoire de Haute-Provence
  60. GRB 231206A: GECAM-B detection of a short burst (correction)
  61. GRB 231205B : MITSuME Akeno optical upper limits
  62. GRB 231206A: GECAM-B detection of a short burst
  63. GRB 231205B: Zadko observatory - Gingin optical observations
  64. GRB 231205B: Gaoyazi/GOT optical upper limit
  65. GRB 231205B: Nanshan/HMT optical upper limit
  66. GRB 231205B: GECAM-B detection of a long burst
  67. GRB 231205B: LCOGT Optical Upper Limits
  68. GRB 231205A: DDOTI Upper Limits on the Afterglow
  69. GRB 231205B: Enhanced Swift-XRT position
  70. GRB 231204A: Glowbug gamma-ray detection
  71. GRB 231204A: CALET Gamma-Ray Burst Monitor detection
  72. GRB 231205B: AKO Optical Upper Limit
  73. GRB 231205B: Swift detection of a burst
  74. GRB 231205A: joint location of multiple instruments by ETJASMIN
  75. GRB 231204A: AstroSat CZTI detection
  76. GRB 231205A: GECAM-B detection of a short burst
  77. GRB 231205A: Fermi GBM Final Real-time Localization
  78. LIGO/Virgo/KAGRA S231129ac: Upper limits from Swift/BAT-GUANO
  79. IceCube-231202A: Upper limits from a search for additional neutrino events in IceCube
  80. GRB 231203A: Fermi GBM Observation
  81. GRB 231204A: Fermi GBM Final Real-time Localization
  82. GRB 231203A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  83. Konus-Wind detection of GRB 231129C
  84. The Fermi GBM team reports the detection of a likely SHORT GRB
  85. GRB 231203A: Fermi GBM Final Real-time Localization
  86. GRB 231129C: Swift-XRT afterglow detection
  87. GRB 231129C: PROMPT optical upper limits for the MAXI/GSC X-ray counterpart and the MASTER afterglow candidate
  88. GRB 231129A: VZLUSAT-2 detection
  89. GRB 231129B: Swift-XRT observations
  90. GRB 231128A: VZLUSAT-2 detection
  91. GRB 231129C: AGILE detection
  92. GRB 231129A : MITSuME Akeno optical upper limits
  93. GRB 231129C: Swift/BAT-GUANO localization of a burst outside the coded FOV
  94. GRB 231129A: Swift-BAT refined analysis
  95. GRB 231129C: MASTER OT detection
  96. GRB 231129A: BOOTES-5/JGT optical upper limit
  97. GRB 231129C: Fermi-LAT detection
  98. GRB 231129A: JinShan optical upper limit
  99. GRB 231129C: GRBAlpha detection
  100. GRB 231129C: Glowbug gamma-ray detection

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