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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.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

19666 results found.

  1. GRB 251014A: Swift detection of a possibly-short burst
  2. GRB 251013C: Swift-XRT counterpart detection
  3. GRB 251003A: Mondy optical upper limit
  4. GRB 251011B inspection: MASTER orphan GRB detection
  5. GRB 251011B: Swift/UVOT Upper Limits
  6. GRB 251011B: SVOM/GRM observation
  7. GRB 251011B: Swift-XRT refined Analysis
  8. GRB 251011B: Fermi GBM Observation
  9. GRB 251011B : MASTER optical observations
  10. GRB 251011B: Enhanced Swift-XRT position
  11. GRB 251011B: Swift detection of a burst
  12. GRB 251007B: Swift/UVOT Upper Limits
  13. GRB251007A: Swift/UVOT Detection
  14. GRB 251007A: Swift-BAT refined analysis
  15. GRB 251007A: SVOM/GRM observation
  16. GRB 251007A: Insight-HXMT detection
  17. GRB 251006A: CALET Gamma-Ray Burst Monitor detection
  18. GRB 251006A: Fermi GBM Observation
  19. GRB 251007A: 1.5m OSN and 2.2m CAHA optical follow-up
  20. GRB 251003A: Fermi GBM Observation
  21. GRB 251007B: COLIBRÍ optical upper limit
  22. GRB 251007A: AstroSat CZTI detection
  23. GRB 250917B: iTelescope T-26 upper limit
  24. GRB 251007A: Swift-XRT refined Analysis
  25. GRB 251007A: Enhanced Swift-XRT position
  26. GRB 251007B: Swift-XRT refined Analysis
  27. GRB 251007B: Enhanced Swift-XRT position
  28. GRB 251007A: AKO Optical Upper Limit
  29. GRB 251007A: CALET Gamma-Ray Burst Monitor detection
  30. GRB 251007A: SVOM/C-GFT optical observations
  31. GRB 251005C: PRIME J-band upper limit
  32. Swift GRB 251007B: Global MASTER-Net observations report
  33. GRB 251007A: Glowbug gamma-ray detection
  34. Swift GRB 251007A: Global MASTER-Net observations report
  35. GRB 251007B: SVOM detection of a faint burst
  36. GRB 251007B: Swift detection of a burst
  37. GRB 251007A: Swift detection of a burst with an optical counterpart
  38. GRB 251006A: Swift/BAT-GUANO subthreshold detection of a short burst
  39. GRB 251005C: SVOM/GRM observation of a likely short GRB
  40. GRB 251005C: COLIBRÍ optical observations
  41. GRB 251003A: LAST optical observations
  42. GRB 251005C: SVOM/VT optical candidate
  43. GRB 251005C: AstroSat CZTI detection
  44. GRB 251005C: Swift/UVOT Upper Limits
  45. GRB 251005C: Swift-XRT refined Analysis
  46. GRB 251005C: Fermi GBM Observation
  47. Swift GRB 251005A: Global MASTER-Net observations report
  48. GRB 251005C: Enhanced Swift-XRT position
  49. GRB 251005C: GOTO optical upper limits
  50. GRB 251005C: Swift detection of a burst
  51. GRB 251003A: Swift-BAT refined analysis
  52. GRB 251003A: Swift/UVOT Upper Limits
  53. GRB 251002A: Swift/UVOT detection
  54. GRB 251003A: Swift-XRT refined Analysis
  55. GRB 251003A: COLIBRÍ photometric redshift
  56. GRB 251003A: Enhanced Swift-XRT position
  57. GRB 251003A: GTC/OSIRIS+ spectroscopic redshift z = 4.412
  58. GRB 251003A: Kilonova-Catcher optical afterglow detection
  59. GRB 251002A: Swift-XRT afterglow detection
  60. GRB 251001B: AbAO optical upper limit
  61. GRB 251003A: LCOGT Optical Detection
  62. GRB 251003A: COLIBRÍ optical detection of the fading afterglow
  63. GRB 251003A: 1.5m OSN afterglow candidate
  64. GRB 251003A: Prompt enhanced Swift-XRT position
  65. GRB 251003A: Swift detection of a burst
  66. Swift GRB251003A: Global MASTER-Net observations report
  67. GRB 251001B: Swift-BAT refined analysis
  68. GRB 251001B: Swift/UVOT Detection
  69. GRB 251001B: GTC/OSIRIS+ spectroscopic redshift z = 2.162
  70. GRB 251001B: Swift-XRT refined Analysis
  71. GRB 251001B: SVOM/VT optical observation
  72. Swift GRB 251001B: Global MASTER-Net observations report
  73. GRB 251001B: Fermi GBM Observation
  74. GRB 251001B: Enhanced Swift-XRT position
  75. GRB 251001B: LCOGT Optical Observations
  76. GRB 251001B: TRT optical afterglow detection and potential host galaxy
  77. GRB 251001B: GOTO optical counterpart detection
  78. GRB 251001B: Swift detection of a burst
  79. GRB 250925A: MAO/AZT-22 optical observations
  80. GRB 250925A: Mondy I-band optical observations
  81. GRB 250924A: SVOM/GRM observation
  82. GRB 250925A: Swift-XRT refined Analysis
  83. GRB 250920C: ULL-ASTRO-MASTER early detection of the optical afterglow with LCO 40-cm telescope at Siding Spring Observatory
  84. GRB 250925A: Swift/UVOT Upper Limits
  85. GRB 250925A: Swift-BAT refined analysis
  86. GRB 250925A: Mondy and AbAO optical observations
  87. GRB 250925A: COLIBRÍ photometric redshift
  88. GRB 250925A : MITSuME Akeno optical upper limits
  89. GRB 250925A: JinShan optical observations
  90. GRB 250925A: 1.5m OSN optical detection and redshift with the 10.4m GTC/OSIRIS+
  91. GRB 250919A / EP250919a: Global MASTER Net before, during and after trigger optical observations
  92. GRB 250925A: COLIBRÍ optical photometry of the afterglow
  93. GRB250925A: Liverpool Telescope optical observations
  94. GRB 250925A: Leavitt Observatory optical upper limit
  95. GRB 250925A: Enhanced Swift-XRT position
  96. GRB 250924A: Swift-BAT refined analysis
  97. GRB 250925A: GROWTH-India Telescope Upper Limits
  98. GRB 250925A: Swift detection of a burst
  99. Swift GRB 250925A: Global MASTER-Net observations report
  100. GRB 250924A: 1.6m Mephisto optical upper limits

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