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"

36352 results found.

  1. GRB 231018A: Glowbug gamma-ray detection
  2. Konus-Wind detection of GRB 231018A
  3. IPN triangulation of GRB 231018A
  4. GRB 231017A: Swift/UVOT Upper Limit
  5. GRB 230911C: ATCA detection of possible radio counterpart
  6. GRB 231019A: Fermi GBM Final Real-time Localization
  7. GRB 231017A: GOTO optical upper limits
  8. GRB 231017A: JinShan optical upper limit
  9. GRB 231018A: GROWTH-India Follow-Up of a Fermi Long GRB
  10. GRB 231017A: Las Cumbres optical upper limit
  11. GRB 231015A: Glowbug gamma-ray detection
  12. GRB 231017A: LCOGT Optical Upper Limits
  13. GRB231017A: GROWTH-India upper limits on the optical afterglow
  14. GRB 231015A: AstroSat CZTI detection
  15. GRB 231018A: Fermi GBM Detection
  16. GRB 231017A: Fermi GBM Detection
  17. GRB 231017A: Swift-XRT observations
  18. GRB 231012B may not be a GRB
  19. GRB 231018A: BALROG localization (Fermi Trigger / GRB 231018521)
  20. GRB 231018A: Fermi GBM Final Real-time Localization
  21. GRB 231017A: Swift ToO observations
  22. GRB 231017A: Swift/BAT-GUANO candidate arcminute localization of a burst
  23. GRB231017A: Fermi GBM Final Localization
  24. IceCube-231014A: Upper limits from a search for additional neutrino events in IceCube
  25. LIGO/Virgo/KAGRA S231014r: Upper limits from Swift/BAT-GUANO
  26. Correction in GCN 34814: GRB 231012B (not GRB 231012A)
  27. GRB 231012A: Fermi GBM Final Real-time Localization
  28. GRB 231012A: Fermi GBM Final Real-time Localization
  29. GRB 231004A: Glowbug gamma-ray detection
  30. LIGO/Virgo/KAGRA S231005j: Upper limits from Swift/BAT-GUANO
  31. IceCube-231004A: Upper limits from a search for additional neutrino events in IceCube
  32. GRB 231004A: CALET Gamma-Ray Burst Monitor detection
  33. Update of IceCube-231004A - Corrected direciton
  34. GRB 231004A: Fermi GBM Final Real-time Localization
  35. GRB 231003A is not a GRB
  36. GRB 231003A: Fermi GBM Final Real-time Localization
  37. LIGO/Virgo/KAGRA S231001aq: Upper limits from Swift/BAT-GUANO
  38. LIGO/Virgo/KAGRA S230930al: Upper limits from Swift/BAT-GUANO
  39. LIGO/Virgo/KAGRA S230928cb: Upper limits from Swift/BAT-GUANO
  40. GRB 230827B: 10.4m GTC spectroscopic redshift
  41. GRB 230930A: Fermi GBM Final Real-time Localization
  42. AT2023sva / GRB230916B: GIT observations of the afterglow
  43. transient AT2023sva: A Binary Driven Hypernova with a possible associated supernova
  44. Swift Triggers 1192740, 1192742 and 1192743 are not astrophysical events
  45. Konus-Wind detection of GRB 230919A
  46. LIGO/Virgo/KAGRA S230924an: Upper limits from Swift/BAT-GUANO
  47. LIGO/Virgo/KAGRA S230920al: Upper limits from Swift/BAT-GUANO
  48. LIGO/Virgo/KAGRA S230919bj: Upper limits from Swift/BAT-GUANO
  49. Fermi Gamma-ray Burst Monitor trigger 717299390/230925076 is not a GRB
  50. Fermi Gamma-ray Burst Monitor trigger 230925241/717313591 is not a GRB
  51. GRB 230812B: r'-band observations from MISTRAL at Observatoire de Haute-Provence
  52. GRB 230921A: Fermi GBM Final Real-time Localization
  53. GRB 230918B: VLT/X-shooter classification of AT 2023tbf (GOTO23aky) as a dwarf nova
  54. IPN triangulation of GRB 230919A (short)
  55. GRB 230919A: Fermi GBM Observation
  56. Fermi GBM Statement for Trigger 716527670/230916144
  57. GRB 230919A: Swift/BAT-GUANO detection of a possibly short burst outside the coded FOV
  58. GRB 230812B : optical observations from MISTRAL at Observatoire de Haute-Provence
  59. GRB 230919A: AstroSat CZTI detection
  60. AT2023sva: redshift from OSIRIS+/GTC of the ZTF afterglow
  61. GRB 230918B: GOTO detection of a fast-rising transient in the GBM localisation region
  62. GRB 230919A: Fermi GBM Final Real-time Localization
  63. Detection of self-absorbed radio emission from GRB 230812B with the JVLA + uGMRT
  64. GRB 230918B: Fermi GBM Final Real-time Localization
  65. GRB 230918A (short): Glowbug gamma-ray detection
  66. GRB 230916B: Glowbug gamma-ray detection
  67. ZTF and SEDM Observations of the Candidate Optical Afterglow AT 2023sva
  68. GRB 230915A: Fermi GBM observation
  69. GRB 230812B: Radio observations with the uGMRT
  70. GRB 230918A: Fermi GBM Final Real-time Localization
  71. GRB 230917A: AstroSat CZTI detection
  72. GRB 230915B: Glowbug gamma-ray detection
  73. GRB 230916A: NuSTAR Discovery of Prompt Emission from a Potential GRB
  74. GRB 230911A: Fermi GBM Observation
  75. GRB 230915A: Swift/BAT-GUANO detection of a burst
  76. LIGO/Virgo/KAGRA S230914ak: Upper limits from Swift/BAT-GUANO
  77. GRB 230911D: GRBAlpha detection
  78. Swift Trigger 1192233 is not a GRB
  79. GRB 230906A: optical counterpart
  80. IceCube-230914A: Upper limits from a search for additional neutrino events in IceCube
  81. GRB 230911A: Swift-XRT afterglow detection
  82. GRB 230913A: CALET Gamma-Ray Burst Monitor detection
  83. GRB 230913A: Glowbug gamma-ray detection
  84. GRB 230812B: Bad Time Intervals for Fermi GBM data
  85. GRB 230913A: Fermi GBM Observation
  86. Swift Trigger 1191904 is not a GRB
  87. GRB 230911A: Swift ToO observations
  88. GRB 230913A: Swift/BAT-GUANO arcminute localization of a burst
  89. Fermi GRB 230913A: Global MASTER-Net observations report
  90. GRB 230911A: GOTO optical counterpart candidate
  91. GRB 230913A: Fermi GBM Final Real-time Localization
  92. GRB 230908A: CALET Gamma-Ray Burst Monitor detection
  93. GRB 230911D: NuSTAR Detection of Prompt Emission
  94. GRB 230911B: AstroSat CZTI detection
  95. GRB 230911C: Swift-XRT refined Analysis
  96. GRB 230911C: Swift-BAT refined analysis
  97. GRB230911C: BOOTES-6/DPRT optical upper limit
  98. GRB 230906A: Chandra detection of the X-ray afterglow
  99. Swift GRB 230911C: Global MASTER-Net observations report
  100. GRB 230911D: Fermi GBM observation

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