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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"

28098 results found.

  1. GRB 221025A: AstroSat CZTI detection
  2. GRB 221009A: SARA-RM 1m Optical Afterglow Detection
  3. GRB 221025A: Fermi GBM Observation
  4. GRB 221024A: Swift/UVOT UV upper limits
  5. GRB 221022A: Swift-XRT observations
  6. GRB 221024A: Swift-XRT refined Analysis
  7. GRB 221023A: Fermi GBM Observation
  8. GRB 221025A: Fermi-LAT detection
  9. IPN triangulation of GRB 221022B (long)
  10. GRB 221024A: GIT confirmation of the optical afterglow
  11. GRB 221024A: Enhanced Swift-XRT position
  12. GRB 221024A: D50 candidate afterglow
  13. GRB 221022A: Fermi GBM detection
  14. GRB 221023A: Fermi-LAT detection
  15. GRB 221022B: Fermi GBM detection
  16. GRB 221021A: Fermi GBM observation
  17. GRB 221024A: Swift detection of a burst
  18. GRB 221023A: Fermi GBM Final Localization
  19. GRB 221022A: Swift/BAT-GUANO detection
  20. GRB 221022B: Swift/BAT-GUANO detection outside the coded FOV
  21. GRB 221009A: Analysis of the initial episode using data of GBM/Fermi and SPI-ACS/INTEGRAL
  22. GRB 221021A: Swift/BAT-GUANO detection outside the coded FOV
  23. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  24. GRB221009A: LBT optical imaging
  25. GRB 221009A: Peak luminosity of the supernova vs. synchrotron afterglow
  26. GRB 221017A: Swift-XRT observations
  27. GRB 221009A: TNG NIR detection
  28. GRB 221009A: BOAO NIR detections
  29. GRB 221009A X-ray light-curve and the indication of TeV light-curve
  30. GRB 221013B: Swift/BAT-GUANO detection
  31. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  32. GRB 221009A: GRANDMA observations
  33. The probability of observing GRB 221009A at z = 0.151
  34. GRB 221009A: Medicina Radio Telescope observations
  35. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  36. GRB 221009A: Second epoch of NuSTAR data
  37. GRB 221016A: Swift-BAT refined analysis
  38. GRB 221016A: Swift/UVOT Detection
  39. GRB 221016A: Swift-XRT refined Analysis
  40. GRB 221016A: Fermi GBM observation
  41. GRB 221009A: A type I BdHN of exceptional energetics
  42. MAXI GRB221017.24: Global MASTER-Net observations report
  43. GRB 221016A: z-band upper limit, possible afterglow brightening
  44. GRB 221017A: MAXI/GSC detection
  45. GRB 221016A: Enhanced Swift-XRT position
  46. GRB 221016A: LCOGT Optical Afterglow Detection
  47. GRB 221016A: Swift detection of a burst
  48. GRB 221009A: Faulkes Telescope North continued optical afterglow follow-up
  49. Konus-Wind observation of the recent SGR 1935+2154 activity
  50. GRB 221009A: VLT spectroscopic detection of the host galaxy
  51. GRB 221009A: Armchair Energetics
  52. GRB 221009A: ALMA and ACA detections
  53. GRB 221009A: Large Binocular Telescope Observatory optical afterglow detection
  54. MAXI/GSC refined analysis of the bright X-ray afterglow of GRB 221009A/Swift J1913.1+1946
  55. GRB 221009A: continued REM optical/NIR observations and evidence for an achromatic steepening in the afterglow light curve
  56. GRB 221009A: OHP optical observations
  57. MAXI GRB 221006A: Redshifts of the possible host galaxies
  58. GRB221009A: LCOGT Continued Observations - Optical Upper Limits
  59. GRB 221009A/Swift J1913.1+1946: low-frequency ASKAP observations
  60. GRB 221006A: Swift-XRT afterglow detection
  61. GRB 221009A: MITSuME Okayama optical observation
  62. GRB 221009A: Sayan observatory 1.6-m telescope observations
  63. GRB 221009A: GMG observation
  64. Afterglow limits of GRB 221006A from OHP
  65. GRB221009A: optical afterglow measurements from Konkoly Observatory
  66. GRB 221009A/Swift J1913.1+1946: SMA observations
  67. INTEGRAL shows increasing activity in SGR J1935+2154
  68. GRB 221009A: COATLI Continued Monitoring of the Afterglow
  69. INTEGRAL detection of a burst from SGR J1935+2154
  70. GRB 221009A: NICER follow-up observations
  71. GRB 221009A: LCOGT Optical Afterglow Detection
  72. GRB 221009A: COATLI Detection of the Afterglow
  73. GRB 221009A (Swift J1913.1+1946): Swift-BAT refined analysis
  74. GRB 221009A: Upper limits from HAWC 8 hours after trigger
  75. Swift/XRT discovery of multiple dust-scattering X-ray rings around GRB 221009A
  76. GRB 221009A: BlackGEM optical observations
  77. GRB 221009A/Swift J1913.1+1946: Lick/Nickel telescope optical observations
  78. Konus-Wind detection of GRB 221009A
  79. GRB 221009A: Lulin SLT-40cm optical observations
  80. GRB 221009A: Upper limits from a neutrino search with IceCube
  81. GRB 221009A (Swift J1913.1+1946): Burke-Gaffney Observatory optical observations
  82. GRB221009A/Swift J1913.1+1946: SRG/ART-XC observation
  83. GRB 221009A / Swift J1913.1+1946: GIT detection of the optical afterglow
  84. GRB221009A/Swift J1913.1+1946: Solar Orbiter STIX measurements
  85. GRB221009A/Swift J1913.1+1946: INTEGRAL SPI/ACS observations
  86. ​GRB 221009A: Multi-color detection of the optical
  87. GRB 221009A: Fermi-LAT refined analysis
  88. GRB 221009: Swift/UVOT Detection
  89. GRB221009A/Swift J1913.1+1946: ATA follow-up observations
  90. GRB 221009A or Swift J1913.1+1946: PRIME near-infrared detection
  91. GRB 221009A/Swift J1913.1+1946: AMI-LA observations
  92. GRB 221009A: REM optical and NIR detection of the afterglow
  93. GRB 221009A: Swift-XRT refined Analysis
  94. GRB 221009A: Nanshan/NEXT photometry and Xinglong-2.16m spectroscopy
  95. GRB 221009A (Swift J1913.1+1946): MeerLICHT observations
  96. Swift J1913.1+1946 : Pre-discovery limits from ZTF
  97. Swift J1913.1+1946: Optical photometry
  98. Fermi trigger No 687014224: Global MASTER-Net observations report
  99. GRB 221009A or Swift J1913.1+1946: Fermi-LAT detection
  100. GRB 221009A: Fermi GBM detection of an extraordinarily bright GRB

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