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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"

22108 results found.

  1. GRB 221009A: Spectroscopic detection of emerging SN features
  2. GRB 221009A: Continued LDT Afterglow Monitoring
  3. GRB 221013B: Swift/BAT-GUANO detection
  4. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  5. GRB 221009A: GRANDMA observations
  6. GRB 221009A: Medicina Radio Telescope observations
  7. GRB 221017A: Swift ToO observations
  8. GRB 221009A: Second epoch of NuSTAR data
  9. GRB 221016A: Swift/UVOT Detection
  10. Konus-Wind detection of GRB 221016A
  11. MAXI GRB221017.24: Global MASTER-Net observations report
  12. Swift GRB221016.99: Global MASTER-Net observations report
  13. GRB 221009A: continued Assy optical afterglow observations, possible SN evidence
  14. GRB 221009A: ATCA radio spectrum
  15. GRB 221009A: VLT spectroscopic detection of the host galaxy
  16. GRB 221009A: ATCA detection
  17. GRB 221009A: ALMA and ACA detections
  18. GRB 221009A: Fermi LAT data rate effects due to extremely high flux
  19. GRB 221009A: Large Binocular Telescope Observatory optical afterglow detection
  20. GRB 221009A: Pan-STARRS optical photometry
  21. GRB 221009A: VLA detection
  22. GRB 221009A: continued REM optical/NIR observations and evidence for an achromatic steepening in the afterglow light curve
  23. GRB 221009A: OHP optical observations
  24. GRB221009A: RTT-150 optical observations
  25. GRB 221009A: Gemini-South Infrared Afterglow Detection
  26. GRB221009A: Gemini-South Optical Afterglow Detection
  27. GRB 221009A: a 397.7 GeV photon observed by Fermi-LAT at 0.4 day after the GBM trigger
  28. GRB221009A: Detection as sudden ionospheric disturbances (SID)
  29. GRB221009A: RTT-150 optical observations
  30. MAXI GRB 221006A: Redshifts of the possible host galaxies
  31. GRB 221009A: MeerKAT detection
  32. GRB 221009A: Lowell Discovery Telescope Afterglow Detection
  33. GRB221009A: LCOGT Continued Observations - Optical Upper Limits
  34. GRB 221009A/Swift J1913.1+1946: low-frequency ASKAP observations
  35. Fermi trigger No 687345829: Global MASTER-Net observations report
  36. Fermi trigger No 687344475: Global MASTER-Net observations report
  37. Fermi trigger No 687340841: Global MASTER-Net observations report
  38. Fermi trigger No 687337536: Global MASTER-Net observations report
  39. GRB 221006A: Swift-XRT afterglow detection
  40. GRB 221009A: Sayan observatory 1.6-m telescope observations
  41. Fermi trigger No 687281393: Global MASTER-Net observations report
  42. Integral GRB221013.04: Global MASTER-Net observations report
  43. Integral GRB221013.00: Global MASTER-Net observations report
  44. Integral GRB221012.99: Global MASTER-Net observations report
  45. Integral GRB221012.94: Global MASTER-Net observations report
  46. Integral GRB221012.91: Global MASTER-Net observations report
  47. Integral GRB221012.88: Global MASTER-Net observations report
  48. Integral GRB221012.87: Global MASTER-Net observations report
  49. Integral GRB221012.77: Global MASTER-Net observations report
  50. Integral GRB221012.74: Global MASTER-Net observations report
  51. Integral GRB221012.72: Global MASTER-Net observations report
  52. Integral GRB221012.71: Global MASTER-Net observations report
  53. Integral GRB221012.68: Global MASTER-Net observations report
  54. Integral GRB221012.68: Global MASTER-Net observations report
  55. Integral GRB221012.98: Global MASTER-Net observations report
  56. Afterglow limits of GRB 221006A from OHP
  57. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  58. GRB 221009A/Swift J1913.1+1946: SMA observations
  59. INTEGRAL shows increasing activity in SGR J1935+2154
  60. GRB 221009A: COATLI Continued Monitoring of the Afterglow
  61. Integral GRB221012.63: Global MASTER-Net observations report
  62. Integral GRB221012.61: Global MASTER-Net observations report
  63. Integral GRB221012.60: Global MASTER-Net observations report
  64. Integral GRB221012.53: Global MASTER-Net observations report
  65. GRB 221009A/Swift J1913.1+1946: eMERLIN observations
  66. Fermi trigger No 687205006: Global MASTER-Net observations report
  67. INTEGRAL detection of a burst from SGR J1935+2154
  68. GRB 221009A: NuSTAR Detection
  69. GRB 221009A: NICER follow-up observations
  70. GRB 221009A: LCOGT Optical Afterglow Detection
  71. GRB221009A: INTEGRAL detection of Hard X-ray emission up to 38 hours after trigger
  72. GRB 221009A: planned observation with the Imaging X-ray Polarimetry Explorer (IXPE)
  73. Fermi trigger No 687190301: Global MASTER-Net observations report
  74. GRB 221009A: Sintez-Newton/CrAO optical observations
  75. GRB 221009A: Upper limits from HAWC 8 hours after trigger
  76. GRB 221006A: Swift ToO observations
  77. GRB 221009A: BlackGEM optical observations
  78. GRB 221009A: NOEMA mm detection
  79. GRB 221006A: CALET Gamma-Ray Burst Monitor detection
  80. Integral GRB221010.89: Global MASTER-Net observations report
  81. Fermi trigger No 687077239: Global MASTER-Net observations report
  82. GRB 221009A: Continued Swift/XRT observations
  83. GRB 221009A/Swift J1913.1+1946: Assy optical afterglow observation
  84. GRB 221009A/Swift J1913.1+1946: Lick/Nickel telescope optical observations
  85. GRB 221009A: Lulin SLT-40cm optical observations
  86. GRB 221009A (Swift J1913.1+1946): Burke-Gaffney Observatory optical observations
  87. GRB221009A/Swift J1913.1+1946: SRG/ART-XC observation
  88. GRB221009A/Swift J1913.1+1946: INTEGRAL SPI/ACS observations
  89. GRB 221009A: Fermi-LAT refined analysis
  90. GRB 221009: Swift/UVOT Detection
  91. GRB221009A/Swift J1913.1+1946: ATA follow-up observations
  92. GRB 221009A or Swift J1913.1+1946: PRIME near-infrared detection
  93. GRB 221009A/Swift J1913.1+1946: AMI-LA observations
  94. GRB 221009A: REM optical and NIR detection of the afterglow
  95. Swift J1913.1+1946: Early Optical Photometry
  96. GRB 221009A: Redshift from X-shooter/VLT
  97. GRB 221009A: Nanshan/NEXT photometry and Xinglong-2.16m spectroscopy
  98. GRB 221009A (Swift J1913.1+1946): MeerLICHT observations
  99. GRB 221009A (Swift J1913.1+1946): Mondy optical observations
  100. GRB 221009A BOOTES-2/TELMA and OSN optical detections

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