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"

32762 results found.

  1. GRB 240123A: Swift-BAT refined analysis
  2. GRB 240123A: Mondy continued optical observations and the PL decay index
  3. GRB 240123A: SAO RAS optical observations
  4. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  5. Fermi/GBM trigger 727752941: BALROG analysis retraction
  6. Fermi GRB 240123B: Global MASTER-Net observations report
  7. GRB 240122A: Swift/UVOT Upper Limits
  8. Fermi GBM Sub-Threshold Detection of GRB 240123A
  9. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  10. GRB 240118A: Swift/UVOT Upper Limits
  11. GRB 240123A: Mondy optical afterglow observations
  12. Konus-Wind detection of GRB 240112A
  13. GRB 240122A: Swift-XRT afterglow detection
  14. GRB 240122A: VLT/X-shooter redshift confirmation
  15. GRB 240122A: Redshift from OSIRIS+/GTC
  16. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  17. GRB 240122A: GOTO optical counterpart candidate
  18. GRB 240122A: Tiled Swift observations
  19. Konus-Wind detection of GRB 240119A (short/hard)
  20. IPN triangulation of GRB 240119A (short)
  21. GRB 240119A: GECAM detection of a short burst
  22. GRB 240118C: GECAM-B detection of a long burst
  23. GRB 240119A: AstroSat CZTI detection of a short burst
  24. GRB 240118A: Mondy optical observations
  25. GRB 240118C: Fermi GBM Observation
  26. Fermi GRB 240119A: Global MASTER-Net observations report
  27. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  28. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  29. GRB 240118A: GRBAlpha detection
  30. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A: correction on the localization
  31. GRB 240115A: Fermi GBM Observation
  32. GRB 240117A: AstroSat CZTI detection
  33. GRB 240118A: Swift ToO observations
  34. GRB 240118A: AbAO optical upper limit
  35. Fermi GRB 240118B: Global MASTER-Net observations report
  36. GRB 240118A: NuSTAR Offline Analysis of the GRB
  37. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  38. Konus-Wind detection of GRB 240118A
  39. GRB 240118A: NuSTAR Detection of a Long GRB
  40. GRB 240118A: Fermi GBM Observation
  41. GRB 240118A: Fermi-LAT detection
  42. GRID detection of GRB 231230A
  43. IPN triangulation of GRB 240112A (long)
  44. Swift Triggers 1209371 through 1209374 are not astrophysical events
  45. Swift Triggers 1209369 and 1209370 are not astrophysical events
  46. GRB 240115B: AstroSat CZTI detection
  47. GRB 240115B: Fermi GBM Detection
  48. IceCube-240105A: ZTF optical observation of blazar PKS 0446+11
  49. GRB 240112D: Glowbug gamma-ray detection
  50. GRB 240112C: Glowbug gamma-ray detection
  51. GRB 240112C: VZLUSAT-2 detection
  52. GRB 240107A: VZLUSAT-2 detection
  53. Fermi GRB 240115B: Global MASTER-Net observations report
  54. GRB 240115B: A long GRB detected by INTEGRAL
  55. Konus-Wind detection of GRB 240112C
  56. Fermi GRB 240115A: Global MASTER-Net observations report
  57. GRB 240112C: GRBAlpha detection
  58. GRB 240112C: Swift/UVOT Detection
  59. GRB 240112C: Fermi GBM Detection
  60. GRB 240112C: SAO RAS optical observations
  61. Fermi GRB 240112D: Global MASTER-Net observations report
  62. Swift GRB 240112C: Global MASTER-Net observations report
  63. Fermi GRB 240112B: Global MASTER-Net observations report
  64. GRB 240109A: Swift-BAT refined analysis
  65. GRB 240109A: Fermi GBM Observation
  66. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  67. GRB 231214A: ATCA Radio Upper Limits
  68. GRB 240106B: Glowbug gamma-ray detection
  69. GRB 240106A: Glowbug gamma-ray detection
  70. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  71. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  72. LIGO/Virgo/KAGRA S240109a: Updated Sky localization
  73. Konus-Wind detection of GRB 240101C
  74. GRB 231215A: radio detection with the VLA
  75. GRB 230818A: further radio observations with the VLA
  76. GRB 230812B: further radio observations with the VLA
  77. GRB 240107A: AstroSat CZTI detection
  78. LIGO/Virgo/KAGRA S240109a: Identification of a GW compact binary merger candidate
  79. IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources
  80. Update of IceCube-240105A - Corrected errors
  81. GRB 240106A: GRBAlpha detection
  82. LIGO/Virgo/KAGRA S240107b: Updated Sky localization and Source Classification
  83. LIGO/Virgo/KAGRA S240107b: Identification of a GW compact binary merger candidate
  84. IPN triangulation of GRB 240101C (short)
  85. GRB GRB240101C: Fermi GBM observation
  86. GRB 240101A: 1.3m DFOT optical observations
  87. GRB 240102A: 1.3m DFOT optical upper limit
  88. GRB 240101B: 1.3m DFOT optical upper limit
  89. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  90. LIGO/Virgo/KAGRA S240104bl: Updated Sky localization
  91. LIGO/Virgo/KAGRA S240104bl: Identification of a GW compact binary merger candidate
  92. GRB 240101C: AstroSat CZTI detection
  93. GRB 231220A: Swift-UVOT upper limit
  94. GRB 240102A: Swift-BAT refined analysis
  95. GRB 240102A: Swift/UVOT Upper Limits
  96. GRB 231230A: Swift-BAT refined analysis
  97. GRB 240101A: Swift-BAT refined analysis
  98. GRB 240101B: Swift-BAT refined analysis
  99. GRB 240102B (Fermi GBM trigger 725926335/240102925) is not a GRB
  100. GRB 240102A: LCOGT Optical Upper Limits

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