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"

37698 results found.

  1. Fermi trigger No 736967879: Global MASTER-Net observations report
  2. Fermi Gamma-ray Burst Monitor trigger 230925241/717313591 is not a GRB
  3. EP240506a: CrAO ZTSH optical upper limit
  4. GRB 240504A: Fermi GBM Observation
  5. Fermi Gamma-ray Burst Monitor trigger 736837160/240508208 is not a GRB
  6. Fermi trigger No 736733320: Global MASTER-Net observations report
  7. IPN triangulation of GRB 240504A
  8. GRB 240502A: 1.3m DFOT Optical upper limit
  9. GRB 240504A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  10. Fermi GBM triggers 736668287/240506253 and 736669277/240506265 are not GRBs
  11. Fermi trigger No 736564880: Global MASTER-Net observations report
  12. IceCube-240424A: GRANDMA Optical Upper Limit of Fermi J2151.3+0220
  13. GRB 240502C: Zeiss-1000 at Koshka observatory observations of GOTO optical counterpart candidates
  14. Fermi trigger No 736461232: Global MASTER-Net observations report
  15. IPN triangulation of GRB 240501B and GRB 240501A - possible episodes of ultra long GRB
  16. Fermi GRB 240504A: Global MASTER-Net observations report
  17. Fermi trigger No 736472503: Global MASTER-Net observations report
  18. GRB 240503A: AstroSat CZTI detection
  19. GRB 240504A: BALROG localization (Fermi Trigger 736492377 / GRB 240504217)
  20. GRB 240504A: Fermi GBM Final Real-time Localization
  21. Fermi trigger No 736387941: Global MASTER-Net observations report
  22. LXT 240402A / GRB 240402B: VLT X-shooter redshift of host
  23. GRB 240502A: GOTO optical upper limit
  24. Fermi trigger No 736379109: Global MASTER-Net observations report
  25. GRB 240502A: Fermi GBM Observation
  26. GRB 240415A 1.3m DFOT Optical upper limit
  27. GRB 240502C: GOTO possible optical counterpart candidates
  28. Fermi GRB 240502B: Global MASTER-Net observations report
  29. GRB 240502C: Fermi GBM Final Localization
  30. Fermi GRB 240502A: Global MASTER-Net observations report
  31. GRB 240501B: GRBAlpha detection
  32. GRB 240430A: GRBAlpha detection
  33. GRB 240502B: Fermi GBM Final Real-time Localization
  34. GRB 240502A long GRB detected by INTEGRAL
  35. GRB 240502A: Fermi GBM Final Real-time Localization
  36. Fermi GRB 240501A: Global MASTER-Net observations report
  37. Fermi trigger No 736197684: Global MASTER-Net observations report
  38. GRB 240426A: VZLUSAT-2 detection
  39. GRB 240425A: VZLUSAT-2 detection
  40. GRB240430A: Fermi GBM Final Localization
  41. GRB 240501B: AstroSat CZTI detection
  42. GRB 240501A: Fermi GBM Final Real-time Localization
  43. GRB 240408B: VZLUSAT-2 detection
  44. GRB 240407A: VZLUSAT-2 detection
  45. X-ray transient EP240414a: Detection of associated supernova
  46. GRB 240425A: GRBAlpha detection
  47. Fermi-LAT gamma-ray observations of IceCube-240424A
  48. GRB 240429A: Fermi GBM Final Real-time Localization
  49. Fermi GRB 240428A: Global MASTER-Net observations report
  50. GRB 240428A: Fermi GBM Final Real-time Localization
  51. GRB 240426A: AstroSat CZTI detection
  52. GRB 240414A: NOEMA detection
  53. LIGO/Virgo/KAGRA S240422ed: Upper limits from GECAM Observations
  54. GRB 240425A: Fermi GBM Final Real-time Localization
  55. Fermi trigger No 735697285: Global MASTER-Net observations report
  56. GRB 240419B: Swift-BAT refined analysis
  57. GRB 240421B: Swift-BAT refined analysis
  58. GRB 240422A: Glowbug gamma-ray detection
  59. IceCube-240424A - IceCube observation of a high-energy neutrino candidate track-like event
  60. GRB 240421B: GRBAlpha detection
  61. GRB 240419A: Swift-BAT refined analysis
  62. GRB 240418A: Swift-BAT refined analysis
  63. LXT240402A/GRB240402B: Chandra X-ray detection
  64. GRB 240419A: Possible ATCA radio detection
  65. GRB 240421B: ATCA radio observations
  66. LIGO/Virgo S240422ed: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  67. LIGO/Virgo/KAGRA S240422ed: AstroSat CZTI non-detection and upper limits
  68. LIGO/Virgo/KAGRA S240422ed: Upper limits from Fermi-GBM Observations
  69. LIGO/Virgo/KAGRA S240421ar: Upper limits from Swift/BAT-GUANO
  70. Fermi trigger No 735470374: Global MASTER-Net observations report
  71. GRB 240421A: Glowbug gamma-ray detection
  72. GRB 240414A: radio detection with the VLA
  73. Fermi-LAT gamma-ray observations of IceCube-240419A
  74. GRB 240414A: AMI-LA radio observations
  75. GRB 240414A: LBT optical detection
  76. GRB 240419B : MITSuME Akeno optical upper limits
  77. GRB 240415B: Swift-XRT observations
  78. GRB 240415A: Swift-XRT refined Analysis
  79. Fermi GRB 240422A: Global MASTER-Net observations report
  80. GRB 240421B: AstroSat CZTI detection
  81. GRB 240422A: Fermi GBM Final Real-time Localization
  82. GRB240421B: Zadko Observations
  83. Fermi GRB 240421B: Global MASTER-Net observations report
  84. Swift GRB 240421B: Global MASTER-Net observations report
  85. GRB 240421B: Fermi GBM Observation
  86. GRB 240421B: Swift-XRT refined Analysis
  87. GRB240421B: BOOTES-5/JGT optical upper limit
  88. GRB 240421B: J-band upper limits from WINTER
  89. GRB 240421B: Swift/UVOT Upper Limits
  90. GRB 240421B: Enhanced Swift-XRT position
  91. Fermi GRB 240421A: Global MASTER-Net observations report
  92. GRB 240421B: Swift detection of a burst
  93. EP240420a: Nanshan optical counterpart observations
  94. GRB 240421A: Fermi GBM Final Real-time Localization
  95. Fermi trigger No 735280430: Global MASTER-Net observations report
  96. GRB240419A: Skynet Optical Afterglow Analysis
  97. GRB240418A - Candidate afterglow from NIRES
  98. GRB 240419B: Swift/UVOT Upper Limits
  99. IceCube-240419A - IceCube observation of a high-energy neutrino candidate track-like event
  100. IceCube-240419A - IceCube observation of a high-energy neutrino candidate track-like event

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