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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"

37675 results found.

  1. GRB 241128A: Swift/UVOT Upper Limits
  2. GRB 241130A: Fermi GBM Detection
  3. GRB 241129A: Swift/BAT-GUANO localization skymap of a burst
  4. LIGO/Virgo/KAGRA S241102br: GRAWITA wide-field optical observations
  5. GRB 241127B: detection of a long GRB by SVOM/ECLAIRs
  6. GRB241201B: Fermi GBM Final Localization
  7. GRB241201B: Fermi GBM Final Localization
  8. Fermi GRB 241201A: Global MASTER-Net observations report
  9. GRB 241201A: BALROG localization (Fermi Trigger 754757764 / GRB 241201622)
  10. GRB 241130A: Fermi GBM Final Real-time Localization
  11. GRB 241130A: Fermi GBM Final Real-time Localization
  12. GRB 241201A: Fermi GBM Final Real-time Localization
  13. Fermi trigger No 754701230: Global MASTER-Net observations report
  14. IPN triangulation of GRB 241128B
  15. Konus-Wind detection of GRB 241114B
  16. GRB 241128A: AbAO optical upper limit
  17. SVOM/GRM observation of a short burst from soft gamma repeater Kes 73
  18. GRB 241128C: SVOM/GRM observation
  19. GRB 241128B: SVOM/GRM observation
  20. GRB 241128A: Swift-BAT refined analysis
  21. GRB 241127A: Swift-BAT refined analysis
  22. GRB 241127A: PRIME near-infrared detection
  23. GRB 241128A: Mondy optical observations
  24. GRB 241128A: GRANDMA and Kilonova-Catcher Optical Afterglow Detections and Upperlimits
  25. Swift GRB 241128A: Global MASTER-Net observations report
  26. Fermi-LAT gamma-ray observations of IceCube-241127A
  27. GRB 241128A: Swift-XRT refined Analysis
  28. GRB 241129A: Fermi GBM Final Real-time Localization
  29. GRB 241128A: Enhanced Swift-XRT position
  30. GRB 241128A: NOT optical observations
  31. GRB 241128A: LCO optical detection
  32. GRB 241128A: 1.5m OSN optical afterglow detection
  33. Fermi trigger No 754492985: Global MASTER-Net observations report
  34. GRB 241128A: Swift-XRT afterglow detection
  35. GRB 241128A: Swift detection of a burst
  36. GRB 241127A: GRANDMA and Kilonova-Catcher optical afterglow detections
  37. GRB 241127A: Swift/UVOT Detection
  38. GRB 241127A: Swift-XRT refined Analysis
  39. GRB 241127A: SVOM/GRM observation
  40. GRB 241127A: Enhanced Swift-XRT position
  41. GRB 241127A: LCOGT (40-cm) optical counterpart detection
  42. GRB 241127A: Swift detection of a burst with an optical counterpart
  43. LIGO/Virgo/KAGRA S241125n: Preliminary flux estimate and spectral analysis of the Swift/BAT-GUANO candidate counterpart
  44. IceCube-241127A: IceCube observation of a high-energy neutrino candidate track-like event
  45. SVOM/GRM observation of GRB 241126B or a short burst from magnetar
  46. GRB 241126A: SVOM/GRM observation
  47. IPN triangulation of GRB 241114B
  48. GRB 241113B: EP-FXT afterglow detection
  49. Konus-Wind detection of GRB 241115D / EP 241115a
  50. LIGO/Virgo/KAGRA S241125n: Upper limits from Konus-Wind observations
  51. GRB 241026A: radio detection with the VLA
  52. LIGO/Virgo/KAGRA S241125n: Upper limits from Fermi-GBM Observations
  53. LIGO/Virgo/KAGRA S241125n: Updated Coincidence with External Event
  54. LIGO/Virgo/KAGRA S241125n: No counterpart candidates in INTEGRAL SPI-ACS prompt observation, comparisong with Swift/BAT counterpart
  55. LIGO/Virgo/KAGRA S241125n: Updated Sky localization and Coincidence with External Event
  56. LIGO/Virgo/KAGRA S241125n: Swift/BAT-GUANO candidate counterpart
  57. GRB 241120A: GRBAlpha detection
  58. GRB 241113B: SVOM/VT optical afterglow observations
  59. Konus-Wind detection of GRB 241117A
  60. GRB 241105A: ATCA radio detection
  61. IPN triangulation of GRB 241117A
  62. GRB 241026A: VIRT Optical Upper Limit
  63. GRB 241025A: VIRT Optical Upper Limit
  64. Konus-Wind detection of GRB 241120A
  65. GRB241120A: OHP/T193 optical observations
  66. GRB 241120A: CALET Gamma-Ray Burst Monitor detection
  67. EP241021a and EP241026b: Keck/LRIS spectroscopic observations
  68. EP trigger ID 01709065118: Keck/LRIS spectroscopic observations
  69. EP-WXT trigger 01709018832: Lick/Kast spectroscopy with the 3 m Shane telescope
  70. GRB 241120A: Mondy and AbAO optical observations
  71. GRB 241113A: Possible ATCA Radio detection
  72. GRB 241120A: Fermi GBM Observation
  73. GRB 241114B: Insight-HXMT/HE detection
  74. GRB241120A: a long GRB detected by INTEGRAL
  75. GRB 241120A: Fermi GBM Final Real-time Localization
  76. GRB 241115A: CALET Gamma-Ray Burst Monitor detection
  77. GRB 241112B: Mephisto further optical observations
  78. GRB 241119A: Fermi GBM Final Real-time Localization
  79. GRB 241030A: J-band observations
  80. GRB 241115a: PRIME near-infrared upper limits
  81. GRB 241117A: Swift/BAT-GUANO localization skymap of a burst
  82. LIGO/Virgo/KAGRA S241116cq: Upper limits from Swift/BAT-GUANO
  83. GRB 241115B: Fermi GBM Observation
  84. Fermi GRB 241118A: Global MASTER-Net observations report
  85. GRB 241118A: Fermi GBM Final Real-time Localization
  86. GRB 241117A: SVOM/GRM observation of a short burst with extended emission
  87. GRB 241117A: Fermi GBM Detection
  88. Fermi GRB 241117B: Global MASTER-Net observations report
  89. GRB 241117B: Fermi GBM Final Real-time Localization
  90. GRB 241115B: Swift/BAT-GUANO localization skymap of a long burst
  91. Fermi GRB 241117A: Global MASTER-Net observations report
  92. GRB 241117A: Fermi GBM Final Real-time Localization
  93. GRB 241115C: Fermi GBM Observation
  94. GRB 241115A: Swift-XRT afterglow detection
  95. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  96. GRB 241115A: Mephisto upper limits
  97. GRB 241113B: Mephisto upper limits
  98. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  99. GRB 241115D / EP 241115a: SVOM/GRM observation
  100. GRB 241115A: Fermi GBM Observation

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