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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"

11557 results found.

  1. GRB 240905B: VZLUSAT-2 detection
  2. GRB 240918B: AstroSat CZTI detection
  3. Fermi GBM Sub-Threshold Detection of GRB240919A / EP240919a
  4. GRB 240414A: further radio observations with the VLA
  5. GRB 240919A / EP240919a: SVOM/GRM observation
  6. EP240919a: INTEGRAL SPI-ACS confirmation of reported high-energy counterpart
  7. EP240919a: INTEGRAL SPI-ACS confirmation of reported high-energy counterpart
  8. GRB 240910A: radio detection with the VLA
  9. EP240919a: JinShan optical upper limits
  10. EP240919a is likely a GRB event
  11. GRB 240918A and GRB 240918B : INTEGRAL SPI ACS LIGHT CURVE
  12. GRB 240918B: Fermi GBM Detection
  13. Fermi GRB 240918A: Global MASTER-Net observations report
  14. GRB 240918A: Fermi GBM Final Real-time Localization
  15. GRB 240916A: GRBAlpha detection
  16. GRB 240914B: GRBAlpha detection
  17. GRB 240916A: NOT optical observation
  18. IPN triangulation of GRB 240913C / EP 240913a
  19. GRB 240825A: INTEGRAL SPI ACS LIGHT CURVE
  20. GRB 240916A: Fermi GBM Observation
  21. GRB 240821A: radio observation with the VLA
  22. GRB 240916A (AT 2024vlp / GOTO24fzn): VLT/X-shooter redshift
  23. GRB 240916A: Swift-XRT afterglow detection
  24. GRB 240916A: Swift ToO observations
  25. GRB 240916A: JinShan optical decay in one of the two GOTO candidates
  26. GRB 240916B: Fermi GBM Final Real-time Localization
  27. GRB 240914B: Fermi GBM Final Localization
  28. GRB 240916A: GOTO identification of two new optical sources within the GBM localisation region
  29. GRB 240916A INTEGRAL SPI ACS LIGHT CURVE
  30. GRB 240916A: Fermi GBM Final Real-time Localization
  31. Fermi Gamma-ray Burst Monitor trigger 748124309/240915846 is not a GRB
  32. EP240913a / GRB 240913C INTEGRAL SPI ACS LIGHT CURVE
  33. GRB 240913C: Fermi GBM detection
  34. GRB 240913C: Joint location by ETJASMIN
  35. GRB 240914B: AstroSat CZTI detection
  36. EP240913A / GRB 240913C: AstroSat CZTI detection
  37. GRB 240910A: SVOM/VT optical observations
  38. GRB 240914B: BALROG localization (Fermi Trigger 747990592 / GRB 240914298)
  39. EP240913a: A GRB Event
  40. GRB 240913B: Fermi GBM Final Real-time Localization
  41. Fermi Gamma-ray Burst Monitor trigger 747837485/240912526 is not a GRB
  42. Fermi trigger No 747920561: Global MASTER-Net observations report
  43. GRB 240912A: SVOM/GRM observation
  44. Fermi GRB 240913A: Global MASTER-Net observations report
  45. GRB 240913A: Fermi GBM Final Real-time Localization
  46. GRB 240912A: J-band observations with WINTER
  47. GRB 240912A: Fermi GBM Observation
  48. GRB 240912A: LCOGT detection and Legacy Surveys likely host galaxy
  49. Fermi Gamma-ray Burst Monitor trigger 747839931/240912555 is not a GRB
  50. GRB 240912A : INTEGRAL SPI ACS LIGHT CURVE
  51. GRB 240912B: Fermi GBM Final Real-time Localization
  52. GRB 240912A: NOT optical spectroscopy
  53. GRB 240912A: Redshift from OSIRIS+/GTC
  54. GRB 240910A: Redshift from OSIRIS+/GTC
  55. GRB 240912A: Fermi GBM Final Real-time Localization
  56. GRB 240910A: Fermi GBM Observation
  57. GRB 240910A: NOT optical observations
  58. GRB 240910A: Swift-XRT detection of GOTO24fvl/AT2024vfp
  59. GRB 240910A: JinShan optical observations
  60. GRB 240910A: GOTO candidate optical counterpart
  61. GRB 240710A: SVOM/GRM observation
  62. GRB 240910A: Swift ToO observations
  63. IPN triangulation of GRB 240905B (short)
  64. GRB 240825A: 7DT Optical Upper Limit
  65. GRB 240910A: GRBAlpha detection
  66. GRB 240910B: Fermi GBM Final Real-time Localization
  67. GRB 240910A: SVOM/GRM observation
  68. Fermi GRB 240910A: Global MASTER-Net observations report
  69. GRB 240910A: Fermi GBM Final Real-time Localization
  70. GRB 240905B: Fermi GBM Observation
  71. Fermi trigger No 747553301: Global MASTER-Net observations report
  72. GRB 240905B: GOTO optical upper limits
  73. Fermi GRB 240908A: Global MASTER-Net observations report
  74. GRB 240908A: Fermi GBM Final Real-time Localization
  75. GRB 240801A: SVOM/GRM observation
  76. GRB 240905B: Swift-XRT observations
  77. GRB 240905B: Fermi-LAT detection
  78. GRB 240905B: Swift ToO observations
  79. Fermi GRB 240905D: Global MASTER-Net observations report
  80. Fermi GRB 240905A: Global MASTER-Net observations report
  81. GRB 240825A: Montarrenti Observatory optical follow-up observations
  82. GRB 240905D: AstroSat CZTI detection
  83. GRB 240905A: SVOM/GRM observation
  84. Fermi GRB 240905B: Global MASTER-Net observations report
  85. GRB 240905D: Fermi GBM Final Real-time Localization
  86. GRB 240905B: AstroSat CZTI detection and localization
  87. GRB 240905C: Fermi GBM Final Real-time Localization
  88. GRB 240905B: Fermi GBM Final Real-time Localization
  89. GRB 240825A: ATCA Detection of Radio Counterpart
  90. GRB 240905A: Fermi GBM Final Real-time Localization
  91. Fermi Gamma-ray Burst Monitor trigger 747163821/240904729 is not a GRB
  92. Fermi trigger No 747163821: Global MASTER-Net observations report
  93. GRB 240828A: SVOM/GRM observation
  94. Fermi Gamma-ray Burst Monitor trigger 240831A is not a GRB
  95. GRB 240828A: GECAM detection
  96. GRB 240831B: Fermi GBM Final Localization
  97. Fermi Gamma-ray Burst Monitor trigger 746882332/240901471 is not a GRB
  98. Fermi trigger No 746923430: Global MASTER-Net observations report
  99. GRB 240828A: SAO RAS AS-500(2) optical observations
  100. Fermi trigger No 746882332: Global MASTER-Net observations report

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