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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"

24511 results found.

  1. Fermi trigger No 747163821: Global MASTER-Net observations report
  2. GRB 240904A: Swift detection of a burst
  3. GRB 240828A: SVOM/GRM observation
  4. LIGO/Virgo/KAGRA S240825ar: Upper limits from Swift/BAT-GUANO
  5. LIGO/Virgo/KAGRA S240807h: Upper limits from Swift/BAT-GUANO
  6. LIGO/Virgo/KAGRA S240902bq: Updated Sky localization
  7. GRB 240828A: GECAM detection
  8. GRB 240831B: Fermi GBM Final Localization
  9. LIGO/Virgo/KAGRA S240902bq: Identification of a GW compact binary merger candidate
  10. GRB 240825A: MeerLICHT afterglow detection
  11. Fermi trigger No 746923430: Global MASTER-Net observations report
  12. GRB 240821A: VLT spectroscopic observations
  13. Fermi trigger No 746882332: Global MASTER-Net observations report
  14. GRB 240829B: GRBAlpha detection
  15. GRB240828B: REM optical/NIR upper limits
  16. Fermi trigger No 746816563: Global MASTER-Net observations report
  17. GRB 240831A: Fermi GBM Final Real-time Localization
  18. GRB 240828B: Mephisto optical upper limit
  19. GRB 240828B: GRANDMA Optical Upper Limit
  20. LIGO/Virgo/KAGRA S240830gn: Coverage and upper limits from MAXI/GSC observations
  21. LIGO/Virgo/KAGRA S240830gn: Updated Sky localization and EM Bright Classification
  22. GRB 240829A: Swift-BAT refined analysis
  23. GRB 240825A: Swift-BAT refined analysis
  24. LIGO/Virgo/KAGRA S240830gn: Identification of a GW compact binary merger candidate
  25. Fermi trigger No 746684112: Global MASTER-Net observations report
  26. GRB 240828B: GWAC-F50A optical upper limit
  27. Fermi trigger No 746587425: Global MASTER-Net observations report
  28. GRB 240829B: Fermi GBM Final Localization
  29. GRB 240828A: Fermi GBM Observation
  30. GRB 240629A: First GRB Detected by BurstCube
  31. GRB 240828A: Swift-XRT afterglow detection
  32. GRB 240825A: iTelescope optical observations
  33. GRB 240829A: Swift detection of a burst
  34. Swift GRB240829.16: Global MASTER-Net observations report
  35. GRB 240828A: Fermi-LAT detection
  36. LAT GRB240828.62: Global MASTER-Net observations report
  37. GRB 240828A: AstroSat CZTI detection of a long burst
  38. GRB 240825A: Upper limits from a neutrino search with IceCube
  39. GRB 240821A: PRIME near-infrared observations
  40. Fermi GRB 240828A: Global MASTER-Net observations report
  41. Fermi trigger No 746438824: Global MASTER-Net observations report
  42. SVOM GRB 240821A: optical afterglow discovery
  43. GRB 240828B : Detection of a possible very soft X-ray transient by SVOM/ECLAIRs
  44. GRB 240828A: Fermi GBM Final Real-time Localization
  45. GRB 240821A: the second and third EP-FXT follow-up observations and afterglow candidates
  46. GRB 240825A: GECAM detection
  47. GRB 240824A: GIT optical upper limit
  48. GRB 240825A: TNG optical photometry and spectroscopy
  49. LIGO/Virgo/KAGRA S240825ar: Updated Sky localization
  50. LIGO/Virgo/KAGRA S240825ar: Updated Sky localization
  51. GRB 240825A: NUTTelA-TAO / BSTI Optical Limits
  52. GRB 240825A: GMG Continued Optical Observation on the Second Night
  53. GRB 240824B: Ondrejov D50 optical limit
  54. GRB 240825A: KAIT optical observations
  55. GRB 240825A: PRIME near-infrared detection
  56. Konus-Wind detection of GRB 240825A (bright/long)
  57. GRB 240825A: Fermi GBM Observation
  58. GRB 240825A : MISTRAL/T193 OHP optical follow-up of the afterglow
  59. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  60. GRB 240825A: REM detection of the optical/NIR afterglow
  61. GRB 240825A: VLT/X-shooter redshift
  62. GRB 240825A: SVOM/C-GFT optical observations
  63. GRB 240825A: Fermi-LAT detection
  64. GRB 240824B: KAIT optical upper limit
  65. GRB 240824B: Fermi GBM Observation
  66. Fermi GRB 240825A: Global MASTER-Net observations report
  67. GRB 240824B: NOT optical upper limit
  68. Swift GRB 240825A: Global MASTER-Net observations report
  69. GRB 240825A: 1.6m Mephisto multi-band detection
  70. GRB 240825A: Fermi GBM Final Real-time Localization
  71. GRB 240824A: Swift-BAT refined analysis
  72. GRB 240824A: Swift-XRT observations
  73. LIGO/Virgo/KAGRA S240825ar: Identification of a GW compact binary merger candidate
  74. GRB 240824B: Swift/BAT arcminute localization of a burst
  75. Fermi GRB 240824C: Global MASTER-Net observations report
  76. GRB 240824C: Fermi GBM Final Localization
  77. GRB 240824B: Fermi GBM Final Real-time Localization
  78. GRB240824A: GRANDMA/TAROT-TCA Upper Limit
  79. GRB 240824A: Skynet Optical Afterglow Discovery
  80. Swift GRB240824.04: Global MASTER-Net observations report
  81. EP240820a: PRIME J-band Observations
  82. GRB 240821A: Swift-XRT observations
  83. GRB 240821A: REM optical/NIR upper limits
  84. Fermi GRB 240821A: Global MASTER-Net observations report
  85. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  86. GRB 240821A: Fermi GBM Observation
  87. Fermi trigger No 745964969: Global MASTER-Net observations report
  88. Fermi trigger No 745925274: Global MASTER-Net observations report
  89. Fermi trigger No 746019401: Global MASTER-Net observations report
  90. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  91. Fermi trigger No 745935375: Global MASTER-Net observations report
  92. GRB240821A: EIRSAT-1 GMOD Detection
  93. GRB240821B: First GRB Detected by EIRSAT-1 GMOD
  94. GRB 240821A: EP-FXT follow-up observation and afterglow candidates
  95. Fermi GRB 240821B: Global MASTER-Net observations report
  96. GRB 240821A: SVOM/GRM observation
  97. GRB 240821A: SVOM/GRM observation
  98. GRB 240821A: GRANDMA/LesMakes-T60 Upper Limit
  99. GRB 240821B: Fermi GBM Final Localization
  100. Fermi trigger No 745866488: Global MASTER-Net observations report

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