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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"

24513 results found.

  1. Swift GRB 240904A: Global MASTER-Net observations report
  2. GRB 240905A: Fermi GBM Final Real-time Localization
  3. Fermi trigger No 747163821: Global MASTER-Net observations report
  4. GRB 240904A: Swift detection of a burst
  5. GRB 240828A: SVOM/GRM observation
  6. LIGO/Virgo/KAGRA S240825ar: Upper limits from Swift/BAT-GUANO
  7. LIGO/Virgo/KAGRA S240807h: Upper limits from Swift/BAT-GUANO
  8. LIGO/Virgo/KAGRA S240902bq: Updated Sky localization
  9. GRB 240828A: GECAM detection
  10. GRB 240831B: Fermi GBM Final Localization
  11. LIGO/Virgo/KAGRA S240902bq: Identification of a GW compact binary merger candidate
  12. GRB 240825A: MeerLICHT afterglow detection
  13. Fermi trigger No 746923430: Global MASTER-Net observations report
  14. GRB 240821A: VLT spectroscopic observations
  15. Fermi trigger No 746882332: Global MASTER-Net observations report
  16. GRB 240829B: GRBAlpha detection
  17. GRB240828B: REM optical/NIR upper limits
  18. Fermi trigger No 746816563: Global MASTER-Net observations report
  19. GRB 240831A: Fermi GBM Final Real-time Localization
  20. GRB 240828B: Mephisto optical upper limit
  21. GRB 240828B: GRANDMA Optical Upper Limit
  22. LIGO/Virgo/KAGRA S240830gn: Coverage and upper limits from MAXI/GSC observations
  23. LIGO/Virgo/KAGRA S240830gn: Updated Sky localization and EM Bright Classification
  24. GRB 240829A: Swift-BAT refined analysis
  25. GRB 240825A: Swift-BAT refined analysis
  26. LIGO/Virgo/KAGRA S240830gn: Identification of a GW compact binary merger candidate
  27. Fermi trigger No 746684112: Global MASTER-Net observations report
  28. GRB 240828B: GWAC-F50A optical upper limit
  29. Fermi trigger No 746587425: Global MASTER-Net observations report
  30. GRB 240829B: Fermi GBM Final Localization
  31. GRB 240828A: Fermi GBM Observation
  32. GRB 240629A: First GRB Detected by BurstCube
  33. GRB 240828A: Swift-XRT afterglow detection
  34. GRB 240825A: iTelescope optical observations
  35. GRB 240829A: Swift detection of a burst
  36. Swift GRB240829.16: Global MASTER-Net observations report
  37. GRB 240828A: Fermi-LAT detection
  38. LAT GRB240828.62: Global MASTER-Net observations report
  39. GRB 240828A: AstroSat CZTI detection of a long burst
  40. GRB 240825A: Upper limits from a neutrino search with IceCube
  41. GRB 240821A: PRIME near-infrared observations
  42. Fermi GRB 240828A: Global MASTER-Net observations report
  43. Fermi trigger No 746438824: Global MASTER-Net observations report
  44. SVOM GRB 240821A: optical afterglow discovery
  45. GRB 240828B : Detection of a possible very soft X-ray transient by SVOM/ECLAIRs
  46. GRB 240828A: Fermi GBM Final Real-time Localization
  47. GRB 240821A: the second and third EP-FXT follow-up observations and afterglow candidates
  48. GRB 240825A: GECAM detection
  49. GRB 240824A: GIT optical upper limit
  50. GRB 240825A: TNG optical photometry and spectroscopy
  51. LIGO/Virgo/KAGRA S240825ar: Updated Sky localization
  52. LIGO/Virgo/KAGRA S240825ar: Updated Sky localization
  53. GRB 240825A: NUTTelA-TAO / BSTI Optical Limits
  54. GRB 240825A: GMG Continued Optical Observation on the Second Night
  55. GRB 240824B: Ondrejov D50 optical limit
  56. GRB 240825A: KAIT optical observations
  57. GRB 240825A: PRIME near-infrared detection
  58. Konus-Wind detection of GRB 240825A (bright/long)
  59. GRB 240825A: Fermi GBM Observation
  60. GRB 240825A : MISTRAL/T193 OHP optical follow-up of the afterglow
  61. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  62. GRB 240825A: REM detection of the optical/NIR afterglow
  63. GRB 240825A: VLT/X-shooter redshift
  64. GRB 240825A: SVOM/C-GFT optical observations
  65. GRB 240825A: Fermi-LAT detection
  66. GRB 240824B: KAIT optical upper limit
  67. GRB 240824B: Fermi GBM Observation
  68. Fermi GRB 240825A: Global MASTER-Net observations report
  69. GRB 240824B: NOT optical upper limit
  70. Swift GRB 240825A: Global MASTER-Net observations report
  71. GRB 240825A: 1.6m Mephisto multi-band detection
  72. GRB 240825A: Fermi GBM Final Real-time Localization
  73. GRB 240824A: Swift-BAT refined analysis
  74. GRB 240824A: Swift-XRT observations
  75. LIGO/Virgo/KAGRA S240825ar: Identification of a GW compact binary merger candidate
  76. GRB 240824B: Swift/BAT arcminute localization of a burst
  77. Fermi GRB 240824C: Global MASTER-Net observations report
  78. GRB 240824C: Fermi GBM Final Localization
  79. GRB 240824B: Fermi GBM Final Real-time Localization
  80. GRB240824A: GRANDMA/TAROT-TCA Upper Limit
  81. GRB 240824A: Skynet Optical Afterglow Discovery
  82. Swift GRB240824.04: Global MASTER-Net observations report
  83. EP240820a: PRIME J-band Observations
  84. GRB 240821A: Swift-XRT observations
  85. GRB 240821A: REM optical/NIR upper limits
  86. Fermi GRB 240821A: Global MASTER-Net observations report
  87. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  88. GRB 240821A: Fermi GBM Observation
  89. Fermi trigger No 745964969: Global MASTER-Net observations report
  90. Fermi trigger No 745925274: Global MASTER-Net observations report
  91. Fermi trigger No 746019401: Global MASTER-Net observations report
  92. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  93. Fermi trigger No 745935375: Global MASTER-Net observations report
  94. GRB240821A: EIRSAT-1 GMOD Detection
  95. GRB240821B: First GRB Detected by EIRSAT-1 GMOD
  96. GRB 240821A: EP-FXT follow-up observation and afterglow candidates
  97. Fermi GRB 240821B: Global MASTER-Net observations report
  98. GRB 240821A: SVOM/GRM observation
  99. GRB 240821A: SVOM/GRM observation
  100. GRB 240821A: GRANDMA/LesMakes-T60 Upper Limit

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