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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"

45712 results found.

  1. Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB
  2. GRB 240805A: Swift-XRT refined Analysis
  3. EP240804a: GSP detects optical candidate counterpart
  4. GRB 240805B: Swift detection of a burst
  5. GRB 240805A: Fermi-LAT detection
  6. GRB 240805A: INTEGRAL spectral analysis
  7. EP240801a: Continued optical observations at ZTSh (CraO)
  8. EP240804a: VLT/X-shooter spectroscopic redshift
  9. EP240804a: LCOGT optical counterpart detection
  10. GRB 240805A: A long GRB detected by INTEGRAL
  11. EP-WXT trigger 00109017646 is not a real source
  12. EP240804a: NOT optical counterpart detection
  13. EP240804a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  14. EP240802a: correction of EP-WXT trigger time in GCN 37019
  15. GRB 240805A: Swift detection of a burst
  16. GRB 240805A: Fermi GBM Final Real-time Localization
  17. Fermi GRB 240804A: Global MASTER-Net observations report
  18. EP240802a: Montarrenti Observatory optical upper limit
  19. GRB 240804A: Fermi GBM Final Real-time Localization
  20. Fermi trigger No 744459130: Global MASTER-Net observations report
  21. IPN triangulation of GRB 240802A / EP 240802a
  22. Fermi Gamma-ray Burst Monitor trigger 744459130/240804425 is not a GRB
  23. EP240801a: Osservatorio Astronomico Nastro Verde upper limit
  24. EP240802A: Bassano Bresciano Observatory upper limit
  25. GRB 240802A: SVOM/GRM observation
  26. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  27. Fermi trigger No 744278264: Global MASTER-Net observations report
  28. EP240802a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  29. GRB 240802A: AstroSat CZTI detection of a long burst
  30. EP240801a: further SAO RAS optical observations
  31. EP240801a: optical observations at CrAO and AbAO
  32. EP240801a: GRANDMA and Kilonova-Catcher optical observations
  33. EP240801a: Leavitt Observatory optical observations
  34. EP240801a: GTC spectroscopy and absorption redshift
  35. EP240801a: SAO RAS optical observations
  36. GRB 240801B: AstroSat CZTI Updated classification - likely a solar flare
  37. EP240801a: JinShan optical observations
  38. GRB 240727C: SVOM/GRM observation
  39. EP240801a: NOT optical observations
  40. EP240801a: follow-up observation with LCOGT
  41. Fermi GBM trigger 744179961 / 240801194 can not be confirmed as a GRB
  42. GRB 240730A: Swift-BAT refined analysis
  43. EP240801a: GSP follow-up observations of the candidate counterpart
  44. Fermi trigger No 744204856: Global MASTER-Net observations report
  45. EP240801a: Kinder follow-up observations of the candidate counterpart
  46. EP240708a: Kinder follow-up observations of the candidate counterpart (duplicate submission of GCN 37002)
  47. EP240801a: KAIT optical counterpart observations
  48. EP240801a: GMG observation
  49. EP240801a: TRT optical counterpart detection
  50. EP240801a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  51. GRB 240801B: AstroSat CZTI detection of a bright long burst
  52. Fermi GRB 240801A: Global MASTER-Net observations report
  53. GRB 240801A: Fermi GBM Final Real-time Localization
  54. GRB 240730C: AstroSat CZTI detection of a long burst
  55. GRB 240731A: Fermi GBM Final Localization
  56. Fermi trigger No 744128417: Global MASTER-Net observations report
  57. Fermi trigger No 744083370: Global MASTER-Net observations report
  58. GRB 240731A: AstroSat CZTI detection
  59. GRB 240730A: Osservatorio Astronomico Nastro Verde upper limit
  60. GRB240730A: BOOTES-5/JGT early optical upper limit
  61. Fermi Gamma-ray Burst Monitor trigger 744061103/240730818 is not a GRB
  62. Fermi GRB 240730B: Global MASTER-Net observations report
  63. GRB 240730B: Fermi GBM Final Real-time Localization
  64. Swift GRB 240730A: Global MASTER-Net observations report
  65. GRB 240730A: Swift-XRT refined Analysis
  66. GRB 240715A: Swift-XRT afterglow detection
  67. GRB 240730A: KAIT Optical Upper Limit
  68. GRB 240727C: GRBAlpha detection
  69. GRB 240730A: Swift/UVOT Upper Limits
  70. GRB 240730A: Enhanced Swift-XRT position
  71. GRB 240730A: Swift detection of a burst
  72. Fermi trigger No 743953682: Global MASTER-Net observations report
  73. GRB 240727A: Swift-BAT refined analysis
  74. Fermi Gamma-ray Burst Monitor trigger 743953682/240729575 is not a GRB
  75. LIGO/Virgo/KAGRA S240615dg: GRAWITA wide-field optical observations
  76. GRB 240727A: observations of optical counterpart.
  77. GRB 240727B: Swift-XRT observations
  78. Fermi GRB 240727A: Global MASTER-Net observations report
  79. GRB 240727A: Swift/UVOT detection
  80. Fermi trigger No 743868421: Global MASTER-Net observations report
  81. Fermi Gamma-ray Burst Monitor trigger 743868421/240728588 is not a GRB
  82. GRB 240727A: Osservatorio Astronomico Nastro Verde upper limit
  83. EP-WXT trigger 01709002661 is not a real source
  84. GRB 240727A: NOT optical observation
  85. GRB 240727A: JinShan optical upper limits
  86. GRB 240727A Bassano Bresciano Observatory upper limit
  87. GRB 240727D: Correction to the GRB name in GCN 36958
  88. GRB 240727A: Fermi GBM Final Real-time Localization
  89. GRB 240727C: AstroSat CZTI detection of a long burst
  90. GRB 240727A: Swift-XRT refined Analysis
  91. GRB 240720B: GRBAlpha detection
  92. GRB 240718A: GRBAlpha detection
  93. GRB 240710B: GRBAlpha detection
  94. GRB 240627A: GRBAlpha detection
  95. Fermi GRB 240726A: Global MASTER-Net observations report
  96. GRB 240727A: Enhanced Swift-XRT position
  97. GRB 240727B: Fermi GBM Observation
  98. Swift GRB240727.16: Global MASTER-Net observations report
  99. GRB240529A: VIRT optical transient detection
  100. GRB 240727B: Swift ToO observations

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