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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"

21106 results found.

  1. LAT GRB230812.79: Global MASTER-Net observations report
  2. Fermi GRB 230812B: Global MASTER-Net observations report
  3. GRB 230812B: Tiled Swift observations
  4. GRB 230812B: Fermi GBM detection of an extremely bright GRB
  5. ZTF23aaoohpy/AT2023lcr: JWST spectroscopy confirmation of an associated type Ic-BL supernova
  6. Fermi trigger No 713525317: Global MASTER-Net observations report
  7. GRB 230805B: Iota Scorpii Observatory, La Spezia, Italy upper limit
  8. Fermi trigger No 713136868: Global MASTER-Net observations report
  9. Fermi trigger No 713205976: Global MASTER-Net observations report
  10. ZTF23aaoohpy/AT2023lcr: JWST observations consistent with the presence of a supernova
  11. transient SPT-SVJ025406.5-702837: ATCA follow-up observations
  12. Fermi GRB 230807A: Global MASTER-Net observations report
  13. Fermi trigger No 713134237: Global MASTER-Net observations report
  14. GRB 230805B : OHP/T193 optical upper limit
  15. GRB 230805B: Swift/UVOT Upper Limits
  16. Fermi trigger No 712991593: Global MASTER-Net observations report
  17. GRB 230805B: Bassano Bresciano observatory upper limit
  18. Fermi trigger No 712987357: Global MASTER-Net observations report
  19. GRB 230805B: NOT optical afterglow confirmation
  20. Fermi GRB 230805A: Global MASTER-Net observations report
  21. GRB 230805B: SAO RAS optical observations
  22. Fermi trigger No 712927418: Global MASTER-Net observations report
  23. Swift GRB 230805B: Global MASTER-Net observations report
  24. Fermi trigger No 712798043: Global MASTER-Net observations report
  25. GRB 230802A: Swift/UVOT Upper Limits
  26. Fermi trigger No 712718833: Global MASTER-Net observations report
  27. Fermi trigger No 712713532: Global MASTER-Net observations report
  28. Fermi trigger No 712651827: Global MASTER-Net observations report
  29. Swift GRB 230802A: Global MASTER-Net observations report
  30. LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations
  31. LIGO/Virgo/KAGRA S230802aq: Coverage and upper limits from MAXI/GSC observations
  32. IceCube-230724A: JCMT/SCUBA-2 submm observations
  33. IceCube-230707A: JCMT/SCUBA-2 submm observations
  34. LIGO/Virgo/KAGRA S230731an: Coverage and upper limits from MAXI/GSC observations
  35. GRB 230723A: Detection of candidate millimeter-band radiation by SPT-3G
  36. Fermi trigger No 712390645: Global MASTER-Net observations report
  37. Fermi-LAT gamma-ray observations of IceCube-230727A
  38. Fermi trigger No 712306969: Global MASTER-Net observations report
  39. IceCube-230727A: No candidates from the Zwicky Transient Facility
  40. GRB 230728A: Swift/UVOT Upper Limits
  41. GRB 230728A: NOT optical observations and possible host galaxy
  42. IceCube-230724A: No counterparts from the Zwicky Transient Facility
  43. Swift GRB230728.12: Global MASTER-Net observations report
  44. Fermi-LAT gamma-ray observations of IceCube-230725A
  45. Fermi-LAT gamma-ray observations of IceCube-230724A
  46. Fermi trigger No 712143685: Global MASTER-Net observations report
  47. Integral GRB230726.26: Global MASTER-Net observations report
  48. GRB 230723B: Further CAHA observations and host galaxy detection
  49. GRB 230723B: ATCA rapid radio follow-up
  50. Integral GRB230725.99: Global MASTER-Net observations report
  51. IceCube Alert 230725.90: Global MASTER-Net observations report
  52. GRB 230723B: GAD Observatory, La Spezia, Italy upper limit
  53. GRB 230723B: Leavitt Observatory upper limit
  54. GRB 230723B: Osservatorio Astronomico Nastro Verde upper limit
  55. GRB 230723B: Montarrenti Observatory upper limit
  56. GRB 230723B: Optical afterglow candidate from CAHA
  57. GRB 230723B: Bassano Bresciano Observatory upper limit
  58. GRB 230723B: non-detections from Observatoire de Haute-Provence
  59. IceCube Alert 230724.08: Global MASTER-Net observations report
  60. Fermi trigger No 711853834: Global MASTER-Net observations report
  61. Fermi trigger No 711805358: Global MASTER-Net observations report
  62. GRB 230723B: Swift/UVOT Upper Limits
  63. Swift GRB 230723B: Global MASTER-Net observations report
  64. GRB 230723B: Swift-XRT observations
  65. Fermi GRB 230723A: Global MASTER-Net observations report
  66. Swift GRB230720.30: Global MASTER-Net observations report
  67. Fermi trigger No 711088412: Global MASTER-Net observations report
  68. Fermi GRB 230713A: Global MASTER-Net observations report
  69. Fermi trigger No 710741042: Global MASTER-Net observations report
  70. IceCube-230707A: No candidates detected by Swift-XRT
  71. IceCube-230707A: No candidates from the Zwicky Transient Facility
  72. Fermi-LAT gamma-ray observations of IceCube-230708A
  73. Fermi-LAT gamma-ray observations of IceCube-230707B
  74. Fermi-LAT gamma-ray observations of IceCube-230707A
  75. GRB 230707A: Swift-XRT observations
  76. IceCube Alert 230708.35: Global MASTER-Net observations report
  77. IceCube Alert 230707.71: Global MASTER-Net observations report
  78. GRB 230707A: Swift ToO observations
  79. GRB 230707A: Swift/BAT-GUANO arcminute localization of a burst
  80. ZTF23aaoohpy/AT2023lcr : HCT follow-up observations
  81. Fermi GRB 230707A: Global MASTER-Net observations report
  82. Integral GRB230706.70: Global MASTER-Net observations report
  83. LIGO/Virgo/KAGRA S230627c: GECKO optical follow-up observations of host galaxy candidates and ZTF23aaptsuy/AT2023lxu
  84. ZTF23aaoohpy/AT2023lcr: AMI-LA radio detection
  85. Fermi trigger No 710117592: Global MASTER-Net observations report
  86. GRB 230328B: LBT detection of the likely host galaxy
  87. LIGO/Virgo/KAGRA S230627c: observations of ZTF23aaptsuy/AT2023lx in AbAO observatory
  88. GRB 230628E: Swift/UVOT Detection
  89. GRB 230628E: ATCA rapid radio follow-up
  90. LIGO/Virgo/KAGRA S230627c: GRANDMA observations of galaxies and ZTF counterpart candidates
  91. AT2023lcr (ATLAS23msn/ZTF23aaoohpy): ALMA 100 GHz Detection
  92. GRB 230628E - VLT spectroscopic observations
  93. ZTF23aaoohpy/AT2023lcr: LBT observations
  94. Fermi GRB 230628C: Global MASTER-Net observations report
  95. GRB230628E: VLT optical identification of afterglow candidate
  96. Fermi GRB 230628D: Global MASTER-Net observations report
  97. Swift GRB230628.93: Global MASTER-Net observations report
  98. LIGO/Virgo/KAGRA S230516az: GOTO candidate counterpart GOTO23hu ruled out by Zwicky Transient Facility observations
  99. LIGO/Virgo/KAGRA S230627c: Additional observations from the Zwicky Transient Facility
  100. AT2023lcr: JCMT SCUBA-2 sub-mm observations

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