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"

32722 results found.

  1. GRB 240809A: SVOM/GRM observation
  2. GRB 240807A: SVOM/GRM observation
  3. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  4. EP240807a: STEP/T80S optical limits
  5. GRB 240807B: AstroSat CZTI detection of a short burst
  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. GRB 240805A: ATCA Radio Upper Limits
  11. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  12. S240807h: Identification of a GW compact binary merger candidate
  13. EP240802a/GRB240802A: KAIT optical upper limit
  14. GRB 240720B: VZLUSAT-2 detection
  15. GRB 240710A: VZLUSAT-2 detection
  16. EP240806A: Liverpool Telescope optical follow-up observations
  17. EP240806a: Gemini North-GMOS spectroscopic redshift of z = 2.818
  18. GRB 240805B: GIT optical upper limit
  19. EP240806a: KAIT optical observations
  20. GRB 240805B: Swift-BAT refined analysis
  21. GRB 240805A: Swift-BAT refined analysis
  22. EP240804a (GRB 240804B): NOT optical observations
  23. EP240806a: LCOGT optical counterpart detection
  24. Konus-Wind detection of GRB 240802A (EP240802a)
  25. Improved IPN triangulation of GRB 240802A / EP 240802a
  26. Konus-Wind detection of GRB 240805A
  27. GRB 240805B Bassano Bresciano Observatory upper limit
  28. GRB240805A: Fermi GBM Observation
  29. GRB 240805B: JinShan optical afterglow detection
  30. GRB 240804B/EP240804a: Correction to the GRB name in GCN 37071
  31. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  32. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  33. EP240806a: EP-FXT detection of the X-ray emission
  34. GRB 240624B: VZLUSAT-2 detection
  35. GRB 240619C: VZLUSAT-2 detection
  36. EP 240806A: LCO optical observations
  37. GRB 240805B: Optical detection with 1.6m Mephisto
  38. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  39. GRB 240805B: Swift/UVOT Upper Limits
  40. GRB 240805A: Swift/UVOT Upper Limits
  41. GRB 240805B: BTA optical afterglow candidate
  42. GRB 240805A: SVOM/GRM observation
  43. GRB 240805B: LCOGT Optical Upper Limits
  44. Swift GRB 240805B: Global MASTER-Net observations report
  45. GRB 240805B: JinShan optical upper limits
  46. EP240801a: BTA BVRI photometry
  47. Fermi GRB 240805A: Global MASTER-Net observations report
  48. Swift GRB 240805A: Global MASTER-Net observations report
  49. GRB 240805A: Fermi-LAT detection
  50. GRB 240805A: INTEGRAL spectral analysis
  51. EP240801a: Continued optical observations at ZTSh (CraO)
  52. EP240804a: VLT/X-shooter spectroscopic redshift
  53. EP240804a: LCOGT optical counterpart detection
  54. GRB 240805A: A long GRB detected by INTEGRAL
  55. EP240804a: NOT optical counterpart detection
  56. EP240802a: correction of EP-WXT trigger time in GCN 37019
  57. Fermi GRB 240804A: Global MASTER-Net observations report
  58. EP240802a: Montarrenti Observatory optical upper limit
  59. IPN triangulation of GRB 240802A / EP 240802a
  60. EP240801a: Osservatorio Astronomico Nastro Verde upper limit
  61. EP240802A: Bassano Bresciano Observatory upper limit
  62. GRB 240802A: SVOM/GRM observation
  63. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  64. EP240801a: further SAO RAS optical observations
  65. EP240801a: optical observations at CrAO and AbAO
  66. EP240801a: GRANDMA and Kilonova-Catcher optical observations
  67. EP240801a: Leavitt Observatory optical observations
  68. EP240801a: GTC spectroscopy and absorption redshift
  69. EP240801a: SAO RAS optical observations
  70. GRB 240801B: AstroSat CZTI Updated classification - likely a solar flare
  71. EP240801a: JinShan optical observations
  72. GRB 240727C: SVOM/GRM observation
  73. EP240801a: NOT optical observations
  74. EP240801a: follow-up observation with LCOGT
  75. Fermi GBM trigger 744179961 / 240801194 can not be confirmed as a GRB
  76. GRB 240730A: Swift-BAT refined analysis
  77. EP240801a: GSP follow-up observations of the candidate counterpart
  78. EP240801a: Kinder follow-up observations of the candidate counterpart
  79. EP240708a: Kinder follow-up observations of the candidate counterpart (duplicate submission of GCN 37002)
  80. EP240801a: KAIT optical counterpart observations
  81. EP240801a: GMG observation
  82. EP240801a: TRT optical counterpart detection
  83. Fermi GRB 240801A: Global MASTER-Net observations report
  84. GRB 240731A: Fermi GBM Final Localization
  85. GRB 240730A: Osservatorio Astronomico Nastro Verde upper limit
  86. Fermi GRB 240730B: Global MASTER-Net observations report
  87. Swift GRB 240730A: Global MASTER-Net observations report
  88. GRB 240715A: Swift-XRT afterglow detection
  89. GRB 240730A: KAIT Optical Upper Limit
  90. GRB 240727C: GRBAlpha detection
  91. GRB 240730A: Swift/UVOT Upper Limits
  92. GRB 240727A: Swift-BAT refined analysis
  93. LIGO/Virgo/KAGRA S240615dg: GRAWITA wide-field optical observations
  94. GRB 240727A: observations of optical counterpart.
  95. GRB 240727B: Swift-XRT observations
  96. Fermi GRB 240727A: Global MASTER-Net observations report
  97. GRB 240727A: Swift/UVOT detection
  98. GRB 240727A: Osservatorio Astronomico Nastro Verde upper limit
  99. GRB 240727A: NOT optical observation
  100. GRB 240727A: JinShan 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