Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

39361 results found.

  1. GRB 240125B: Fermi GBM Final Localization
  2. GRB240122A: PRIME near infrared detection
  3. GRB 240123B: Fermi GBM Observation
  4. GRB 240123A: Glowbug gamma-ray detection
  5. GRB 240125A (short): Glowbug gamma-ray detection
  6. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  7. GRB 240123A: GRBAlpha detection
  8. IPN triangulation of GRB 240123C (short)
  9. GRB 240123A: further SAO RAS optical observations
  10. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  11. GRB 240123A: Swift-BAT refined analysis
  12. IceCube Alert 240123.48: Global MASTER-Net observations report
  13. GRB 240123A: Mondy continued optical observations and the PL decay index
  14. GRB 240123A: SAO RAS optical observations
  15. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  16. Fermi/GBM trigger 727752941: BALROG analysis retraction
  17. GRB 240123A: Enhanced Swift-XRT position
  18. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  19. Fermi GRB 240123B: Global MASTER-Net observations report
  20. GRB 240122A: Swift/UVOT Upper Limits
  21. GRB 240123A: Swift-XRT refined Analysis
  22. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  23. Fermi GBM Sub-Threshold Detection of GRB 240123A
  24. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  25. GRB 240123B: Fermi GBM Final Real-time Localization
  26. GRB 240118A: Swift/UVOT Upper Limits
  27. GRB 240122B: Glowbug gamma-ray detection
  28. GRB 240123A: Mondy optical afterglow observations
  29. Konus-Wind detection of GRB 240112A
  30. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  31. Swift GRB240123.46: Global MASTER-Net observations report
  32. GRB 240122A: Swift-XRT afterglow detection
  33. GRB 240122A: VLT/X-shooter redshift confirmation
  34. GRB 240122A: Redshift from OSIRIS+/GTC
  35. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  36. GRB 240122A: GOTO optical counterpart candidate
  37. GRB 240122A: Tiled Swift observations
  38. Konus-Wind detection of GRB 240119A (short/hard)
  39. GRB 240122A: MAXI/GSC detection
  40. IPN triangulation of GRB 240119A (short)
  41. GRB 240119A: GECAM detection of a short burst
  42. GRB 240118C: GECAM-B detection of a long burst
  43. GRB 240119A: AstroSat CZTI detection of a short burst
  44. GRB 240118A: Mondy optical observations
  45. GRB 240118A: Swift-XRT afterglow detection
  46. GRB 240118C: Fermi GBM Observation
  47. Fermi GRB 240119A: Global MASTER-Net observations report
  48. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  49. GRB 240119A: Fermi GBM Final Localization
  50. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  51. GRB 240118C: Swift/BAT-GUANO detection of a burst
  52. GRB 240118A: GRBAlpha detection
  53. GRB 240115A: Fermi GBM Observation
  54. GRB 240118C: Fermi GBM Final Localization
  55. GRB 240118D: AstroSat CZTI detection
  56. GRB 240117A: AstroSat CZTI detection
  57. GRB 240118A: Swift ToO observations
  58. GRB 240118A: AbAO optical upper limit
  59. Fermi GRB 240118B: Global MASTER-Net observations report
  60. GRB 240118A: NuSTAR Offline Analysis of the GRB
  61. GRB 240117A: Glowbug gamma-ray detection
  62. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  63. Konus-Wind detection of GRB 240118A
  64. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)
  65. GRB 240118A: NuSTAR Detection of a Long GRB
  66. GRB 240118A: Fermi GBM Observation
  67. GRB 240118B: Fermi GBM Final Real-time Localization
  68. LAT GRB240118.08: Global MASTER-Net observations report
  69. GRB 240118A: Fermi-LAT detection
  70. GRID detection of GRB 231230A
  71. GRB 240118A: Fermi GBM Final Real-time Localization
  72. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  73. IPN triangulation of GRB 240112A (long)
  74. GRB 240115B: AstroSat CZTI detection
  75. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  76. GRB 240115B: Fermi GBM Detection
  77. GRB 240112D: Glowbug gamma-ray detection
  78. GRB 240112C: Glowbug gamma-ray detection
  79. GRB 240112C: VZLUSAT-2 detection
  80. GRB 240107A: VZLUSAT-2 detection
  81. Integral GRB240115.70: Global MASTER-Net observations report
  82. Fermi GRB 240115B: Global MASTER-Net observations report
  83. GRB 240115B: A long GRB detected by INTEGRAL
  84. GRB 240115B: Fermi GBM Final Real-time Localization
  85. Konus-Wind detection of GRB 240112C
  86. Fermi GRB 240115A: Global MASTER-Net observations report
  87. GRB 240115A: Fermi GBM Final Real-time Localization
  88. GRB 240112C: GRBAlpha detection
  89. GRB 240114A: MAXI/GSC detection
  90. GRB 240112C: Swift/UVOT Detection
  91. GRB 240112C: Fermi GBM Detection
  92. Fermi trigger No 726773850: Global MASTER-Net observations report
  93. GRB 240112C: Swift-XRT refined Analysis
  94. GRB 240112C: SAO RAS optical observations
  95. GRB 240112E: Fermi GBM Final Localization
  96. Fermi GRB 240112D: Global MASTER-Net observations report
  97. GRB 240112D: Fermi GBM Final Real-time Localization
  98. Fermi trigger No 726774492: Global MASTER-Net observations report
  99. Swift GRB 240112C: Global MASTER-Net observations report
  100. Fermi GRB 240112B: Global MASTER-Net observations report

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