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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"

21112 results found.

  1. GRB 220501A: GRANDMA/TJML Optical Observations
  2. Swift GRB 220430A: Global MASTER-Net observations report
  3. GRB 220430A: GRANDMA observations
  4. GRB 220430A: Mondy and AbAO optical upper limits
  5. GRB 220430A: MeerLICHT optical upper limits
  6. GRB 220426A: Swift-XRT and UVOT observations
  7. GRB 220426A: Tiled Swift observations
  8. Fermi GRB 220426A: Global MASTER-Net observations report
  9. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  10. Fermi GRB 220426B: Global MASTER-Net observations report
  11. IceCube-220425A: MASTER: flaring blazar TXS 1742-078 as the possible neutrino source candidate
  12. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  13. IceCube Alert 220425.11: Global MASTER-Net observations report
  14. Fermi trigger No 672492774: Global MASTER-Net observations report
  15. IceCube Alert 220424.05: Global MASTER-Net observations report
  16. Fermi trigger No 672374264: Global MASTER-Net observations report
  17. Fermi-LAT Gamma-ray Observations of IceCube-220421A
  18. Fermi trigger No 672221879: Global MASTER-Net observations report
  19. GRB 220418B: Swift-XRT observations
  20. IceCube Alert 220421.22: Global MASTER-Net observations report
  21. Fermi trigger No 672093919: Global MASTER-Net observations report
  22. GRB 220403C: Further Swift-XRT observations
  23. GRB 220418B: Swift ToO observations
  24. GRB 220412B: Swift/UVOT Upper Limits
  25. Fermi GRB 220418A: Global MASTER-Net observations report
  26. Fermi GRB 220417A: Global MASTER-Net observations report
  27. Fermi trigger No 671729344: Global MASTER-Net observations report
  28. GRB 220412B: TNG optical observations
  29. GRB 220412A: GRANDMA observations
  30. GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
  31. GRB 220412A: RATIR Observations of the Fading Afterglow
  32. GRB 220412B: Swift-XRT observations
  33. Swift GRB 220412B: Global MASTER-Net observations report
  34. GRB 220408A: HCT optical upper limit
  35. GRB 220412B: Swift detection of a short burst
  36. GRB 220412A: Swift/UVOT Upper Limits
  37. GRB 220408A: GRANDMA observations
  38. GRB 220403B: GRANDMA observations
  39. GRB 220412A: RATIR Afterglow Candidate
  40. Swift GRB220412.28: Global MASTER-Net observations report
  41. GRB 220403B: Swift/UVOT Detection
  42. GRB 220408A: Lowell Discovery Telescope Optical Observations
  43. Fermi GRB 220411A: Global MASTER-Net observations report
  44. GRB 220408A: RATIR Optical and NIR Observations
  45. GRB 220403B: 1.3m DFOT Optical upper limit
  46. GRB 220408A: 1.3m DFOT Optical upper limit
  47. GRB 220403C: Swift-XRT observations
  48. GRB 220408A: NOT optical observations and archival detection
  49. GRB 220403C: Swift ToO observations
  50. GRB 220408A: BOOTES-5/JGT optical afterglow detection
  51. Fermi GRB 220408B: Global MASTER-Net observations report
  52. GRB 220408A: Swift/UVOT Detection
  53. GRB 220408A: Xinglong-2.16m optical upper limit
  54. GRB 220408A: KAIT Optical Observations
  55. Fermi GRB 220408A: Global MASTER-Net observations report
  56. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, SAO RAS, CrAO)
  57. Fermi-LAT Gamma-ray Observations of IceCube-220405B
  58. IceCube-220405A: No Candidate Counterparts from the Zwicky Transient Facility
  59. IceCube-220405B: No Candidate Counterparts from the Zwicky Transient Facility
  60. GRB 220403B: 1.5m OSN optical observation
  61. IceCube Alert 220405.93: Global MASTER-Net observations report
  62. GRB 220403B: Kitab optical observations
  63. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  64. IceCube Alert 220405.21: Global MASTER-Net observations report
  65. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  66. GRB 220403B: LBT observations
  67. Swift GRB 220403B: Global MASTER-Net observations report
  68. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  69. GRB 220403A: Tautenburg observations
  70. Fermi GRB 220403A: Global MASTER-Net observations report
  71. Swift GRB220402.16: Global MASTER-Net observations report
  72. Fermi GRB 220401B: Global MASTER-Net observations report
  73. Fermi trigger No 670501065: Global MASTER-Net observations report
  74. Fermi GRB 220330A: Global MASTER-Net observations report
  75. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  76. GRB 220325A: GRANDMA observations
  77. GRB 220325A: Swift/UVOT Upper Limits
  78. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, TSHAO, AbAO)
  79. GRB 220325A: Tautenburg observations
  80. GRB 220325A: 1.3m DFOT Optical upper limit
  81. GRB 220325A: MASTER Global Robotic Net optical observations
  82. GRB 220319A: GRANDMA observations
  83. GRB220319A: Optical observations from NOT
  84. GRB 220319A: MASTER Global Robotic Net optical observations
  85. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  86. IceCube-220317A: MASTER Global Robotic Net optical observations
  87. GRB 220315A: MASTER Global Robotic Net optical observations
  88. GRB 220306B: Swift/UVOT Upper Limits
  89. GRB 210722A: TAROT Reunion observatory optical light curve
  90. GRB 210222B: TAROT Reunion observatory optical light curve
  91. GRB 201021C: TAROT Reunion observatory optical light curve
  92. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  93. GRB 220310C: Swift-XRT observations
  94. GRB 220310C: Swift ToO observations
  95. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  96. Integral GRB220311.69: Global MASTER-Net observations report
  97. Integral GRB220311.69: Global MASTER-Net observations report
  98. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  99. GRB 220310A: GIT confirmation of optical afterglow.
  100. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN

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