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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"

32734 results found.

  1. GRB 240118A: GRBAlpha detection
  2. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A: correction on the localization
  3. GRB 240115A: Fermi GBM Observation
  4. GRB 240117A: AstroSat CZTI detection
  5. GRB 240118A: Swift ToO observations
  6. GRB 240118A: AbAO optical upper limit
  7. Fermi GRB 240118B: Global MASTER-Net observations report
  8. GRB 240118A: NuSTAR Offline Analysis of the GRB
  9. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  10. Konus-Wind detection of GRB 240118A
  11. GRB 240118A: NuSTAR Detection of a Long GRB
  12. GRB 240118A: Fermi GBM Observation
  13. GRB 240118A: Fermi-LAT detection
  14. GRID detection of GRB 231230A
  15. IPN triangulation of GRB 240112A (long)
  16. Swift Triggers 1209371 through 1209374 are not astrophysical events
  17. Swift Triggers 1209369 and 1209370 are not astrophysical events
  18. GRB 240115B: AstroSat CZTI detection
  19. GRB 240115B: Fermi GBM Detection
  20. IceCube-240105A: ZTF optical observation of blazar PKS 0446+11
  21. GRB 240112D: Glowbug gamma-ray detection
  22. GRB 240112C: Glowbug gamma-ray detection
  23. GRB 240112C: VZLUSAT-2 detection
  24. GRB 240107A: VZLUSAT-2 detection
  25. Fermi GRB 240115B: Global MASTER-Net observations report
  26. GRB 240115B: A long GRB detected by INTEGRAL
  27. Konus-Wind detection of GRB 240112C
  28. Fermi GRB 240115A: Global MASTER-Net observations report
  29. GRB 240112C: GRBAlpha detection
  30. GRB 240112C: Swift/UVOT Detection
  31. GRB 240112C: Fermi GBM Detection
  32. GRB 240112C: SAO RAS optical observations
  33. Fermi GRB 240112D: Global MASTER-Net observations report
  34. Swift GRB 240112C: Global MASTER-Net observations report
  35. Fermi GRB 240112B: Global MASTER-Net observations report
  36. GRB 240109A: Swift-BAT refined analysis
  37. GRB 240109A: Fermi GBM Observation
  38. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  39. GRB 231214A: ATCA Radio Upper Limits
  40. GRB 240106B: Glowbug gamma-ray detection
  41. GRB 240106A: Glowbug gamma-ray detection
  42. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  43. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  44. LIGO/Virgo/KAGRA S240109a: Updated Sky localization
  45. Konus-Wind detection of GRB 240101C
  46. GRB 231215A: radio detection with the VLA
  47. GRB 230818A: further radio observations with the VLA
  48. GRB 230812B: further radio observations with the VLA
  49. GRB 240107A: AstroSat CZTI detection
  50. LIGO/Virgo/KAGRA S240109a: Identification of a GW compact binary merger candidate
  51. IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources
  52. Update of IceCube-240105A - Corrected errors
  53. GRB 240106A: GRBAlpha detection
  54. LIGO/Virgo/KAGRA S240107b: Updated Sky localization and Source Classification
  55. LIGO/Virgo/KAGRA S240107b: Identification of a GW compact binary merger candidate
  56. IPN triangulation of GRB 240101C (short)
  57. GRB GRB240101C: Fermi GBM observation
  58. GRB 240101A: 1.3m DFOT optical observations
  59. GRB 240102A: 1.3m DFOT optical upper limit
  60. GRB 240101B: 1.3m DFOT optical upper limit
  61. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  62. LIGO/Virgo/KAGRA S240104bl: Updated Sky localization
  63. LIGO/Virgo/KAGRA S240104bl: Identification of a GW compact binary merger candidate
  64. GRB 240101C: AstroSat CZTI detection
  65. GRB 231220A: Swift-UVOT upper limit
  66. GRB 240102A: Swift-BAT refined analysis
  67. GRB 240102A: Swift/UVOT Upper Limits
  68. GRB 231230A: Swift-BAT refined analysis
  69. GRB 240101A: Swift-BAT refined analysis
  70. GRB 240101B: Swift-BAT refined analysis
  71. GRB 240102B (Fermi GBM trigger 725926335/240102925) is not a GRB
  72. GRB 240102A: LCOGT Optical Upper Limits
  73. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  74. GRB 240101A: Terskol Zeiss-2000 optical observations
  75. GRB 240101C: GRBAlpha detection
  76. GRB 240101B: Swift/UVOT Upper Limits
  77. GRB 240101A: Swift/UVOT Upper Limits
  78. GRB 240101B: KAIT Optical Upper Limit
  79. GRB 240101A: KAIT Optical Upper Limit
  80. LIGO/Virgo/KAGRA S231231ag: Updated Sky localization and Source Classification
  81. LIGO/Virgo/KAGRA S231231ag: Identification of a GW compact binary merger candidate
  82. GRB231230A: Fermi GBM Observation
  83. GRB 231230A: GOTO optical upper limits
  84. GRB 231230A: Swift/UVOT Upper Limits
  85. GRB 231230A: NOT optical upper limits
  86. IPN triangulation of GRB 231224A (short)
  87. LIGO/Virgo/KAGRA S231226av: Updated Sky localization
  88. LIGO/Virgo/KAGRA S231226av: Identification of a GW compact binary merger candidate
  89. GRB 231222B: GRBAlpha detection
  90. LIGO/Virgo/KAGRA S231224e: Updated Sky localization and Source Classification
  91. LIGO/Virgo/KAGRA S231224e: Identification of a GW compact binary merger candidate
  92. LIGO/Virgo/KAGRA S231223j: Updated Sky localization
  93. GRB 231222B: Swift-XRT afterglow detection
  94. LIGO/Virgo/KAGRA S231223j: Identification of a GW compact binary merger candidate
  95. GRB 231222B: Fermi GBM Detection
  96. GRB 231222A: Tiled Swift observations
  97. IceCube-231211A: GRANDMA observations of PKS2047+098
  98. GRID detection of GRB 231215A
  99. GRB 231220A: Swift-XRT follow-up observations
  100. GRB 231220A: Swift ToO observations

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