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"

23700 results found.

  1. IPN triangulation of GRB 240807A / EP 240807a
  2. Swift GRB 240809A: Global MASTER-Net observations report
  3. GRB 240807A: SVOM/GRM observation
  4. EP240807a: STEP/T80S optical limits
  5. IceCube Alert 240808.27: Global MASTER-Net observations report
  6. EP EP240807a: Global MASTER-Net observations report
  7. EP EP240806a: Global MASTER-Net observations report
  8. GRB 240801A: GRBAlpha detection
  9. GRB 240710B: VZLUSAT-2 detection
  10. Fermi trigger No 744761058: Global MASTER-Net observations report
  11. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  12. EP-WXT trigger 01709018832: KAIT optical observations of the star flare
  13. EP240802a/GRB240802A: KAIT optical upper limit
  14. GRB 240720B: VZLUSAT-2 detection
  15. GRB 240710A: VZLUSAT-2 detection
  16. The EP-WXT trigger 01709018832 on August 7th is likely a flaring star
  17. EP240807a: EP-WXT detection of a fast X-ray transient
  18. EP240806a: Gemini North-GMOS spectroscopic redshift of z = 2.818
  19. GRB 240805B: GIT optical upper limit
  20. EP240806a: KAIT optical observations
  21. GRB 240805B: Swift-BAT refined analysis
  22. GRB 240805A: Swift-BAT refined analysis
  23. Fermi trigger No 744629911: Global MASTER-Net observations report
  24. EP240806a: LCOGT optical counterpart detection
  25. Konus-Wind detection of GRB 240802A (EP240802a)
  26. Konus-Wind detection of GRB 240805A
  27. GRB 240805B Bassano Bresciano Observatory upper limit
  28. GRB240805A: Fermi GBM Observation
  29. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  30. Fermi Gamma-ray Burst Monitor trigger 240806402/744629911 is not a GRB
  31. EP240806a: EP-FXT detection of the X-ray emission
  32. GRB 240626B: VZLUSAT-2 detection
  33. GRB 240624B: VZLUSAT-2 detection
  34. GRB 240619C: VZLUSAT-2 detection
  35. EP 240806A: LCO optical observations
  36. EP240806a: GSP optical counterpart detection
  37. EP240806a: EP-WXT detection of a fast X-ray transient
  38. EP240804a: BOOTES-6/DPRT optical detection
  39. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  40. GRB 240805B: Swift-XRT refined Analysis
  41. Fermi trigger No 744544656: Global MASTER-Net observations report
  42. GRB 240805B: Swift/UVOT Upper Limits
  43. GRB 240805A: Swift/UVOT Upper Limits
  44. GRB 240805B: BTA optical afterglow candidate
  45. Swift GRB 240805B: Global MASTER-Net observations report
  46. EP240801a: BTA BVRI photometry
  47. Fermi GRB 240805A: Global MASTER-Net observations report
  48. Swift GRB 240805A: Global MASTER-Net observations report
  49. Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB
  50. GRB 240805A: Swift-XRT refined Analysis
  51. EP240804a: GSP detects optical candidate counterpart
  52. GRB 240805B: Swift detection of a burst
  53. GRB 240805A: INTEGRAL spectral analysis
  54. EP240801a: Continued optical observations at ZTSh (CraO)
  55. EP240804a: LCOGT optical counterpart detection
  56. EP240804a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  57. GRB 240805A: Swift detection of a burst
  58. Fermi GRB 240804A: Global MASTER-Net observations report
  59. EP240802a: Montarrenti Observatory optical upper limit
  60. Fermi trigger No 744459130: Global MASTER-Net observations report
  61. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  62. Fermi trigger No 744278264: Global MASTER-Net observations report
  63. EP240802a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  64. EP240801a: optical observations at CrAO and AbAO
  65. EP240801a: GRANDMA and Kilonova-Catcher optical observations
  66. EP240801a: GTC spectroscopy and absorption redshift
  67. EP240801a: NOT optical observations
  68. GRB 240730A: Swift-BAT refined analysis
  69. EP240801a: GSP follow-up observations of the candidate counterpart
  70. Fermi trigger No 744204856: Global MASTER-Net observations report
  71. EP240801a: Kinder follow-up observations of the candidate counterpart
  72. EP240801a: KAIT optical counterpart observations
  73. EP240801a: GMG observation
  74. EP240801a: TRT optical counterpart detection
  75. EP240801a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  76. GRB 240801B: AstroSat CZTI detection of a bright long burst
  77. Fermi GRB 240801A: Global MASTER-Net observations report
  78. Fermi trigger No 744128417: Global MASTER-Net observations report
  79. Fermi trigger No 744083370: Global MASTER-Net observations report
  80. GRB 240730A: Osservatorio Astronomico Nastro Verde upper limit
  81. GRB240730A: BOOTES-5/JGT early optical upper limit
  82. Fermi GRB 240730B: Global MASTER-Net observations report
  83. Swift GRB 240730A: Global MASTER-Net observations report
  84. GRB 240730A: Swift-XRT refined Analysis
  85. GRB 240730A: KAIT Optical Upper Limit
  86. GRB 240727C: GRBAlpha detection
  87. GRB 240730A: Swift detection of a burst
  88. Fermi trigger No 743953682: Global MASTER-Net observations report
  89. GRB 240727A: Swift-BAT refined analysis
  90. LIGO/Virgo/KAGRA S240615dg: GRAWITA wide-field optical observations
  91. GRB 240727B: Swift-XRT observations
  92. Fermi GRB 240727A: Global MASTER-Net observations report
  93. GRB 240727A: Swift/UVOT detection
  94. Fermi trigger No 743868421: Global MASTER-Net observations report
  95. GRB 240727A: Osservatorio Astronomico Nastro Verde upper limit
  96. GRB 240727A: NOT optical observation
  97. GRB 240727A: Swift-XRT refined Analysis
  98. GRB 240720B: GRBAlpha detection
  99. GRB 240718A: GRBAlpha detection
  100. GRB 240710B: GRBAlpha detection

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