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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"

36316 results found.

  1. GRB 241130A: Fermi GBM Detection
  2. IceCube-241127A: Upper limits from a search for additional neutrino events in IceCube
  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. IPN triangulation of GRB 241128B
  14. Konus-Wind detection of GRB 241114B
  15. GRB 241128A: AbAO optical upper limit
  16. GRB 241128C: SVOM/GRM observation
  17. GRB 241128B: SVOM/GRM observation
  18. GRB 241128A: Swift-BAT refined analysis
  19. GRB 241127A: Swift-BAT refined analysis
  20. GRB 241127A: PRIME near-infrared detection
  21. GRB 241128A: Mondy optical observations
  22. GRB 241128A: GRANDMA and Kilonova-Catcher Optical Afterglow Detections and Upperlimits
  23. Swift GRB 241128A: Global MASTER-Net observations report
  24. GRB 241128A: Swift-XRT refined Analysis
  25. GRB 241129A: Fermi GBM Final Real-time Localization
  26. GRB 241128A: Enhanced Swift-XRT position
  27. GRB 241128A: NOT optical observations
  28. GRB 241128A: LCO optical detection
  29. GRB 241128A: 1.5m OSN optical afterglow detection
  30. GRB 241128A: Swift-XRT afterglow detection
  31. GRB 241128A: Swift detection of a burst
  32. GRB 241127A: GRANDMA and Kilonova-Catcher optical afterglow detections
  33. GRB 241127A: Swift/UVOT Detection
  34. GRB 241127A: Swift-XRT refined Analysis
  35. GRB 241127A: SVOM/GRM observation
  36. GRB 241127A: Enhanced Swift-XRT position
  37. GRB 241127A: LCOGT (40-cm) optical counterpart detection
  38. GRB 241127A: Swift detection of a burst with an optical counterpart
  39. LIGO/Virgo/KAGRA S241125n: Preliminary flux estimate and spectral analysis of the Swift/BAT-GUANO candidate counterpart
  40. SVOM/GRM observation of GRB 241126B or a short burst from magnetar
  41. GRB 241126A: SVOM/GRM observation
  42. IPN triangulation of GRB 241114B
  43. GRB 241113B: EP-FXT afterglow detection
  44. Konus-Wind detection of GRB 241115D / EP 241115a
  45. LIGO/Virgo/KAGRA S241125n: Upper limits from Konus-Wind observations
  46. GRB 241026A: radio detection with the VLA
  47. LIGO/Virgo/KAGRA S241125n: Upper limits from Fermi-GBM Observations
  48. LIGO/Virgo/KAGRA S241125n: Updated Coincidence with External Event
  49. LIGO/Virgo/KAGRA S241125n: No counterpart candidates in INTEGRAL SPI-ACS prompt observation, comparisong with Swift/BAT counterpart
  50. LIGO/Virgo/KAGRA S241125n: Updated Sky localization and Coincidence with External Event
  51. LIGO/Virgo/KAGRA S241125n: Swift/BAT-GUANO candidate counterpart
  52. GRB 241120A: GRBAlpha detection
  53. GRB 241113B: SVOM/VT optical afterglow observations
  54. Konus-Wind detection of GRB 241117A
  55. GRB 241105A: ATCA radio detection
  56. IPN triangulation of GRB 241117A
  57. GRB 241026A: VIRT Optical Upper Limit
  58. GRB 241025A: VIRT Optical Upper Limit
  59. Konus-Wind detection of GRB 241120A
  60. GRB 241120A: CALET Gamma-Ray Burst Monitor detection
  61. EP241021a and EP241026b: Keck/LRIS spectroscopic observations
  62. EP trigger ID 01709065118: Keck/LRIS spectroscopic observations
  63. EP-WXT trigger 01709018832: Lick/Kast spectroscopy with the 3 m Shane telescope
  64. GRB 241120A: Mondy and AbAO optical observations
  65. GRB 241113A: Possible ATCA Radio detection
  66. GRB 241120A: Fermi GBM Observation
  67. GRB 241114B: Insight-HXMT/HE detection
  68. GRB241120A: a long GRB detected by INTEGRAL
  69. GRB 241120A: Fermi GBM Final Real-time Localization
  70. GRB 241115A: CALET Gamma-Ray Burst Monitor detection
  71. GRB 241112B: Mephisto further optical observations
  72. GRB 241119A: Fermi GBM Final Real-time Localization
  73. GRB 241030A: J-band observations
  74. GRB 241115a: PRIME near-infrared upper limits
  75. GRB 241117A: Swift/BAT-GUANO localization skymap of a burst
  76. LIGO/Virgo/KAGRA S241116cq: Upper limits from Swift/BAT-GUANO
  77. GRB 241115B: Fermi GBM Observation
  78. Fermi GRB 241118A: Global MASTER-Net observations report
  79. GRB 241118A: Fermi GBM Final Real-time Localization
  80. Updates to IceCube realtime alert system for muon tracks
  81. GRB 241117A: SVOM/GRM observation of a short burst with extended emission
  82. GRB 241117A: Fermi GBM Detection
  83. Fermi GRB 241117B: Global MASTER-Net observations report
  84. GRB 241117B: Fermi GBM Final Real-time Localization
  85. GRB 241115B: Swift/BAT-GUANO localization skymap of a long burst
  86. Fermi GRB 241117A: Global MASTER-Net observations report
  87. GRB 241117A: Fermi GBM Final Real-time Localization
  88. GRB 241115C: Fermi GBM Observation
  89. GRB 241115A: Swift-XRT afterglow detection
  90. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  91. GRB 241115A: Mephisto upper limits
  92. GRB 241113B: Mephisto upper limits
  93. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  94. GRB 241115D / EP 241115a: SVOM/GRM observation
  95. GRB 241115A: Fermi GBM Observation
  96. GRB 241115A: LCOGT Optical Upper Limits
  97. GRB 241115C: Swift/BAT-GUANO localization skymap of a burst
  98. Fermi GRB 241115B: Global MASTER-Net observations report
  99. GRB 241115B: Fermi GBM Final Real-time Localization
  100. EP241113a: No Detection in Fermi-GBM Observations

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