Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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"

32769 results found.

  1. GRB 240123A: Glowbug gamma-ray detection
  2. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  3. GRB 240123A: GRBAlpha detection
  4. IPN triangulation of GRB 240123C (short)
  5. Fermi-LAT gamma-ray observations of IceCube-240123A
  6. GRB 240123A: further SAO RAS optical observations
  7. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  8. GRB 240123A: Swift-BAT refined analysis
  9. GRB 240123A: Mondy continued optical observations and the PL decay index
  10. GRB 240123A: SAO RAS optical observations
  11. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  12. Fermi/GBM trigger 727752941: BALROG analysis retraction
  13. Fermi GRB 240123B: Global MASTER-Net observations report
  14. GRB 240122A: Swift/UVOT Upper Limits
  15. Fermi GBM Sub-Threshold Detection of GRB 240123A
  16. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  17. GRB 240118A: Swift/UVOT Upper Limits
  18. GRB 240123A: Mondy optical afterglow observations
  19. Konus-Wind detection of GRB 240112A
  20. GRB 240122A: Swift-XRT afterglow detection
  21. GRB 240122A: VLT/X-shooter redshift confirmation
  22. GRB 240122A: Redshift from OSIRIS+/GTC
  23. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  24. GRB 240122A: GOTO optical counterpart candidate
  25. GRB 240122A: Tiled Swift observations
  26. Konus-Wind detection of GRB 240119A (short/hard)
  27. IPN triangulation of GRB 240119A (short)
  28. GRB 240119A: GECAM detection of a short burst
  29. GRB 240118C: GECAM-B detection of a long burst
  30. GRB 240119A: AstroSat CZTI detection of a short burst
  31. GRB 240118A: Mondy optical observations
  32. GRB 240118C: Fermi GBM Observation
  33. Fermi GRB 240119A: Global MASTER-Net observations report
  34. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  35. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  36. GRB 240118A: GRBAlpha detection
  37. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A: correction on the localization
  38. GRB 240115A: Fermi GBM Observation
  39. GRB 240117A: AstroSat CZTI detection
  40. GRB 240118A: Swift ToO observations
  41. GRB 240118A: AbAO optical upper limit
  42. Fermi GRB 240118B: Global MASTER-Net observations report
  43. GRB 240118A: NuSTAR Offline Analysis of the GRB
  44. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  45. Konus-Wind detection of GRB 240118A
  46. GRB 240118A: NuSTAR Detection of a Long GRB
  47. GRB 240118A: Fermi GBM Observation
  48. GRB 240118A: Fermi-LAT detection
  49. GRID detection of GRB 231230A
  50. IPN triangulation of GRB 240112A (long)
  51. Swift Triggers 1209371 through 1209374 are not astrophysical events
  52. Swift Triggers 1209369 and 1209370 are not astrophysical events
  53. GRB 240115B: AstroSat CZTI detection
  54. GRB 240115B: Fermi GBM Detection
  55. IceCube-240105A: ZTF optical observation of blazar PKS 0446+11
  56. GRB 240112D: Glowbug gamma-ray detection
  57. GRB 240112C: Glowbug gamma-ray detection
  58. GRB 240112C: VZLUSAT-2 detection
  59. GRB 240107A: VZLUSAT-2 detection
  60. Fermi GRB 240115B: Global MASTER-Net observations report
  61. GRB 240115B: A long GRB detected by INTEGRAL
  62. Konus-Wind detection of GRB 240112C
  63. Fermi GRB 240115A: Global MASTER-Net observations report
  64. GRB 240112C: GRBAlpha detection
  65. GRB 240112C: Swift/UVOT Detection
  66. GRB 240112C: Fermi GBM Detection
  67. GRB 240112C: SAO RAS optical observations
  68. Fermi GRB 240112D: Global MASTER-Net observations report
  69. Swift GRB 240112C: Global MASTER-Net observations report
  70. Fermi GRB 240112B: Global MASTER-Net observations report
  71. GRB 240109A: Swift-BAT refined analysis
  72. GRB 240109A: Fermi GBM Observation
  73. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  74. GRB 231214A: ATCA Radio Upper Limits
  75. GRB 240106B: Glowbug gamma-ray detection
  76. GRB 240106A: Glowbug gamma-ray detection
  77. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  78. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  79. LIGO/Virgo/KAGRA S240109a: Updated Sky localization
  80. Konus-Wind detection of GRB 240101C
  81. GRB 231215A: radio detection with the VLA
  82. GRB 230818A: further radio observations with the VLA
  83. GRB 230812B: further radio observations with the VLA
  84. GRB 240107A: AstroSat CZTI detection
  85. LIGO/Virgo/KAGRA S240109a: Identification of a GW compact binary merger candidate
  86. IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources
  87. Update of IceCube-240105A - Corrected errors
  88. GRB 240106A: GRBAlpha detection
  89. LIGO/Virgo/KAGRA S240107b: Updated Sky localization and Source Classification
  90. LIGO/Virgo/KAGRA S240107b: Identification of a GW compact binary merger candidate
  91. IPN triangulation of GRB 240101C (short)
  92. GRB GRB240101C: Fermi GBM observation
  93. GRB 240101A: 1.3m DFOT optical observations
  94. GRB 240102A: 1.3m DFOT optical upper limit
  95. GRB 240101B: 1.3m DFOT optical upper limit
  96. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  97. LIGO/Virgo/KAGRA S240104bl: Updated Sky localization
  98. LIGO/Virgo/KAGRA S240104bl: Identification of a GW compact binary merger candidate
  99. GRB 240101C: AstroSat CZTI detection
  100. GRB 231220A: Swift-UVOT upper limit

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov