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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

36380 results found.

  1. Fermi GRB 241221A: Global MASTER-Net observations report
  2. GRB 241221A: Fermi GBM Final Real-time Localization
  3. GRB 241217A/EP241217b: SOAR afterglow detection
  4. GRB 241218A: Mondy AZT-33IK optical upper limit
  5. EP241217a : Leavitt Observatory optical upper limit
  6. GRB 241217A/EP241217b: tentative VLT spectroscopic redshift z=1.879
  7. GRB 241217a/EP241217B: 1.6m Mephisto optical upper limits
  8. GRB 241218A: Swift/UVOT Upper Limits
  9. GRB 241209B: EP-FXT afterglow detection
  10. Konus-Wind detection of GRB 241204A (short/hard)
  11. GRB 241218A: NOT optical upper limits
  12. GRB 241218A: Swift-BAT refined analysis
  13. GRB 241217A / EP241217B: GRANDMA/T1MPicduMidi optical upperlimits
  14. GRB 241217A/EP241217B: Fermi-GBM Sub-Threshold Detection
  15. GRB 241217A / EP241217b: Nanshan/HMT optical upper limit
  16. GRB 241217A: refined SVOM/MXT data analysis. Long lasting X-ray emission.
  17. GRB 241217A / EP241217b: NOT optical upper limits
  18. GRB 241218A: REM optical upper limit
  19. GRB 241217A/EP241217b: REM optical/NIR upper limits
  20. GRB 241218a: Liverpool Telescope optical follow-up
  21. GRB 241217a: Liverpool Telescope optical follow-up
  22. GRB 241218A: Swift-XRT refined Analysis
  23. GRB 241218A: NUTTelA-TAO / BSTI Optical Limits
  24. GRB 241209A: ATCA radio follow-up observations
  25. EP241217b/GRB 241217A: EP detection of the prompt X-ray emssion
  26. GRB 241218A: LCOGT Optical Upper Limit
  27. GRB 241218A: Enhanced Swift-XRT position
  28. GRB 241217A: GMG Optical Upper Limit
  29. GRB 241218A: Swift detection of a burst
  30. GRB 241217A : SVOM/VT optical afterglow detection
  31. GRB 241217A: Swift-XRT afterglow detection
  32. GRB 241217A: LCO optical upper limit
  33. GRB 241217A: GRANDMA/TAROT optical upperlimits
  34. EP241217A: Non-detection from Fermi-GBM Observations
  35. GRB 241217A : SVOM/ECLAIRs,GRM,MXT detection of a long burst with a bright X-ray afterglow candidate
  36. GRB 241214A: GRBAlpha detection
  37. GRB 241213A (EP241213a): GRBAlpha detection
  38. GRB 241209D: GRBAlpha detection
  39. GRB 241213A: Swift-BAT refined analysis
  40. GRB 241214A: Swift/BAT-GUANO localization skymap of a burst
  41. Konus-Wind detection of GRB 241213A (EP 241213a)
  42. GRB 241215A: Mondy AZT-33IK optical observations
  43. GRB 241212A: Swift-XRT observations
  44. GRB 241214A: SVOM/GRM observation
  45. GRB 241215A: Nanshan/HMT optical upper limit
  46. GRB 241215A: Montarrenti Observatory optical upper limit
  47. GRB 241215A: GROWTH-India telescope optical upper limit
  48. GRB 241215A: A long GRB detected by INTEGRAL
  49. GRB 241213B: Swift-XRT observations
  50. GRB 241209D: CALET Gamma-Ray Burst Monitor detection
  51. GRB 241209B: SVOM/VT optical continuous fading
  52. GRB 241213A: SVOM/VT optical candidate
  53. GRB 241213B: Tiled Swift observations
  54. GRB 241213A: Swift/UVOT Upper Limits
  55. GRB 241213B: CALET Gamma-Ray Burst Monitor detection
  56. GRB 241213A: Swift-XRT refined Analysis
  57. GRB 241212A: Fermi GBM detection
  58. GRB 241212A: Swift ToO observations
  59. GRB 241213A: LCOGT Optical Upper Limits
  60. EP241213a/GRB241213a: Likely joint detection and INTEGRAL/SPI-ACS counterpart
  61. GRB 241213B: MAXI/GSC detection
  62. GRB 241213A: REM optical/NIR upper limits
  63. GRB 241213A: Enhanced Swift-XRT position
  64. GRB241212A: OHP/T193 optical observations
  65. GRB 241213A: SAO RAS optical upper limit
  66. Swift GRB 241213A: Global MASTER-Net observations report
  67. GRB 241213A: Swift detection of a burst
  68. GRB 241212A : SVOM/C-GFT optical upper limit at early phase
  69. GRB 241212A : SVOM/VT bright optical afterglow
  70. GRB 241212A: AstroSat CZTI detection
  71. GRB 241209B: GRANDMA/TRT upper limit
  72. GRB 241207A: TSHAO Zeiss-1000 optical observations
  73. GRB 241212A: SVOM detection of a bright long burst
  74. GRB 241212A: Fermi GBM Final Real-time Localization
  75. GRB 241209B: Mondy AZT-33IK and AbAO AS-32 optical observations
  76. GRB 241209A: Chandra X-ray Detection
  77. Konus-Wind detection of GRB 241209B
  78. GRB 241207A: EIRSAT-1 GMOD Detection
  79. GRB 241209A: Redshift of the likely host galaxy z = 0.784 from OSIRIS+/GTC
  80. GRB 241209B: GRBAlpha detection
  81. GRB 241206C: GRBAlpha detection
  82. GRB 241211A: Fermi GBM Final Real-time Localization
  83. GRB 241129A: Fermi GBM Observation
  84. GRB 241209B: Swift/BAT-GUANO localization skymap of a burst
  85. GRB 241209D: REM optical/NIR upper limits
  86. Konus-Wind detection of GRB 241209D
  87. GRB 241209B: Swift-XRT afterglow detection
  88. GRB 241209C: Fermi GBM Observation
  89. GRB 241209A: Swift-XRT refined Analysis
  90. Fermi Gamma-ray Burst Monitor trigger 755485387 / 241210044 is not a GRB
  91. GRB 241128A: CrAO ZTSh and Mondy AZT-33IK optical observations
  92. GRB 241209D: AstroSat CZTI detection
  93. GRB 241209A: EP-FXT follow-up observations
  94. GRB 241209B: SVOM/VT afterglow detection
  95. GRB 241207B: Fermi GBM Observation
  96. GRB 241209A: BOOTES-7 and 2.2m CAHA early optical upper limits
  97. GRB 241209D: Swift-XRT refined Analysis
  98. GRB 241209D: Fermi GBM Observation
  99. GRB 241209A: VLT/HAWK-I near-IR counterpart candidate
  100. GRB 241209D: COLIBRÍ detection of the afterglow

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