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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"

45753 results found.

  1. GRB 261007A / EP261007a: SVOM/VT optical observations
  2. GRB 261007A: Swift-XRT afterglow detection
  3. EP261007b: SVOM/VT optical upper limits
  4. GRB 261007A: SVOM/COLIBRÍ (FM-GFT) optical observations
  5. EP261007b: Einstein Probe detection of an X-ray transient
  6. GRB 261007A / EP261007a: NuSTAR detection of prompt emission
  7. EP Alert 261007.63: Global MASTER-Net observations report
  8. GRB 261007A / EP261007a: ULL-ASTRO-MASTER detection of the optical afterglow with LCO 40-cm telescope at McDonald Observatory
  9. GRB 261007A: Autonomous identification and follow-up of the counterpart to GRB 261007A by BTSbot with ZTF and P60/SEDM
  10. SVOM GRB261007.27: Global MASTER-Net observations report
  11. GRB 261007A: GROWTH-India Telescope optical observations
  12. GRB 261007A / EP261007a: TRT optical observations
  13. GRB 261007A: Swift ToO observations
  14. GRB 261007A: SVOM/C-GFT optical observations
  15. GRB 261007A / EP261007a: LCO optical observations
  16. GRB 261007B: Fermi GBM Final Real-time Localization
  17. SVOM GRB261007.23: Global MASTER-Net observations report
  18. GRB 261005B: Swift-BAT refined analysis
  19. EP261006a: NOT spectroscopy of a blue continuum
  20. GRB 261007A: WINTER J-band observations
  21. EP261006a: LT and NOT discovery of an optical counterpart
  22. GRB 261007A: Fermi GBM observation
  23. GRB 261007A / EP261007a: VLT/X-shooter spectroscopic redshift z = 2.101
  24. EP261007a/GRB 261007A: Einstein Probe detection of an X-ray transient
  25. EP261006a: SVOM/VT optical upper limits
  26. EP261006a: Einstein Probe detection of an X-ray transient
  27. GRB 261007A: KAIT optical counterpart candidate
  28. GRB 261007A: SVOM detection of a burst
  29. EP trigger 01709320985: SVOM/C-GFT optical upper limits
  30. GRB 261005B: Swift-XRT refined Analysis
  31. EP trigger 01709320985: Ondrejov D50 optical upper limits
  32. GRB 261005A: Glowbug gamma-ray detection
  33. GRB 261005B: Swift/UVOT Upper Limits
  34. GRB 261005B: J-band upper limit with WINTER
  35. GRB 261001A: GECAM-B observation of a likely long GRB
  36. GRB 261005B: Fermi GBM Observation
  37. GRB 261005B: Enhanced Swift-XRT position
  38. The EP-WXT trigger 01709320908 is likely a flaring star
  39. EP trigger 01709320908: Ondrejov D50 observation, fading star suggests stellar flare
  40. GRB 261005B: Swift detection of a burst
  41. GRB 261005A: Fermi GBM Final Real-time Localization
  42. GRB 261003A: Glowbug gamma-ray detection of a likely short burst
  43. GRB 261002A: Fermi GBM Final Localization
  44. EP#01709320865: Swift-XRT observations
  45. GRB 260930B: SVOM/GRM observation
  46. Konus-Wind detection of GRB 260919A / EP 260920a
  47. GRB 260921B: GECAM-B observation
  48. EP261003a: J-band upper limit with WINTER
  49. EP261003a: refined analysis of the EP-WXT and autonomous EP-FXT observations
  50. GRB 260930B: GECAM-B detection of a burst
  51. EP261003a: COLIBRÍ optical upper limits
  52. Trigger_21915: Swift ToO observations (retracted)
  53. Fermi GRB 261003A: Global MASTER-Net observations report
  54. EP261003a: Einstein Probe detection of an X-ray transient
  55. GRB 261003A: Fermi GBM Final Real-time Localization
  56. EP Alert 261003.01: Global MASTER-Net observations report
  57. Fermi-LAT Gamma-ray Observations of IceCube-260930A
  58. Fermi GBM Detection of GRB 260919A / EP260920a
  59. IceCube-260930A: Upper limits from a search for additional neutrino events in IceCube
  60. IPN triangulation of GRB 260919A / EP260920a
  61. Fermi GRB 260930B: Global MASTER-Net observations report
  62. GRB 260926C: SVOM/GRM observation
  63. GRB 260930B: Fermi GBM Final Real-time Localization
  64. GRB 260930A: Fermi GBM Final Real-time Localization
  65. IceCube-260930A - IceCube observation of a high-energy neutrino candidate track-like event
  66. IceCube Alert 260930A: Global MASTER-Net observations report
  67. The EP-WXT trigger 01709320790 is likely a flaring star
  68. EP260927a: SVOM/ECLAIRs Upper Limit
  69. GRB 260926C: AstroSat CZTI detection
  70. GRB 260926C: GECAM-B observation
  71. GRB 260926A: GECAM-B observation
  72. EP260927a: Global MASTER-Net observations report
  73. EP260927a: Einstein Probe detection of a fast X-ray transient
  74. GRB 260926B: Glowbug gamma-ray detection of a likely short burst
  75. GRB 260926A: Glowbug gamma-ray detection
  76. GRB 260924A: VLA detection
  77. GRB 260924A: Swift/UVOT UV grism spectrum results
  78. GRB 260924A: AbAO optical observations
  79. Fermi GRB 260928A: Global MASTER-Net observations report
  80. GRB 260928A: Fermi GBM Final Real-time Localization
  81. EP260924a: Global MASTER-Net observations report
  82. GRB 260925A: Swift-BAT refined analysis
  83. Swift Trigger 1513439: consistent with noise and not astrophysical
  84. GRB 260924A: Upper limits from a neutrino search with IceCube
  85. Fermi GRB 260926C: Global MASTER-Net observations report
  86. GRB 260926C: Fermi GBM Final Real-time Localization
  87. GRB260914A: MAO/AZT-22 optical observations
  88. GRB 260926B: Fermi GBM Final Real-time Localization
  89. Fermi GRB 260926A: Global MASTER-Net observations report
  90. GRB 260924A: Near-infrared detection with MDM/MIRAGE
  91. GRB 260926A: Fermi GBM Final Real-time Localization
  92. The EP-WXT trigger 01709320726 is likely a flaring star
  93. GRB 260924A: COLIBRÍ optical observations
  94. GRB 260924A: Second-epoch J-band upper limit from the SYSU 80 cm infrared telescope
  95. EP260924a: J-band upper limit by SYSU 80cm infrared telescope
  96. GRB 260925A: J-band upper limit by SYSU 80cm infrared telescope
  97. GRB 260925A: Swift-XRT refined Analysis
  98. EP260924a: EP-FXT follow-up observation
  99. Swift Trigger 1513439 is probably not a GRB
  100. GRB 260925A: Swift/UVOT Upper Limits

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