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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"

37724 results found.

  1. GRB 241112B: Mephisto optical upper limits
  2. GRB 241112B: GOTO optical upper limits
  3. GRB 241112B: Swift ToO observations
  4. GRB 241112B : detection of a long GRB by SVOM/ECLAIRs
  5. GRB 241107A: INTEGRAL IBIS localization
  6. GRB 241112A: Fermi GBM Final Real-time Localization
  7. GRB 241105A: VLT/FORS2 refined spectroscopic redshift z = 2.681
  8. IPN triangulation of GRB 241107A (short/hard)
  9. GRB 241107A: INTEGRAL/IBIS/PICsIT detection of a short burst
  10. GRB 241025C: VZLUSAT-2 detection
  11. GRB 241025A: VZLUSAT-2 detection
  12. GRB 241018A: cubesat Avion detection
  13. Fermi trigger No 752990530: Global MASTER-Net observations report
  14. GRB 241111A: Fermi GBM Final Real-time Localization
  15. GRB 241030B: TESS detection of optical counterpart
  16. Fermi trigger No 752878030: Global MASTER-Net observations report
  17. EP241109a: KAIT photometry and 3 m Shane spectroscopy from Lick observatory
  18. EP241107a: AbAO optical upper limit
  19. LIGO/Virgo/KAGRA S241109bn: Upper limits from Fermi-GBM Observations
  20. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  21. GRB 241108A: Swift-XRT observations
  22. EP241107A: MASTER optical observations of xray transient
  23. EP241107a: KAIT optical observations
  24. GRB 241108A: Swift ToO observations
  25. GRB 241030A: TESS observations
  26. GRB 241108A: COLIBRÍ Upper Limits on the Optical Counterpart
  27. GRB 241108A : a likely weak long GRB detected by SVOM/ECLAIRs
  28. GRB 241025A: radio detection with the VLA
  29. GRB 241104A: CALET Gamma-Ray Burst Monitor detection
  30. GRB 241107A: SVOM/GRM detection of a short burst
  31. GRB 241105A: EP-FXT follow-up observations
  32. GRB 241105A: SVOM/GRM observation
  33. GRB 241105a: PRIME near-infrared upper limits
  34. GRB 241105A: ePESSTO+ NTT optical afterglow detection
  35. GRB 241025A: LBT optical observations
  36. GRB241105A: Gemini-South Optical Afterglow Detection
  37. GRB 241105A: VLT/FORS2 optical afterglow rapid fading
  38. GRB 241105A: Swift/UVOT Detection
  39. EP241101a: CrAO ZTSH optical observations
  40. GRB 241105A: Swift/BAT-GUANO refined analysis of short burst with extended emission
  41. GRB 241030A: optical afterglow detection from the INAF Asiago Observatory
  42. GRB 241105A: BOOTES-7 optical detection
  43. GRB 241030A: Mondy optical observations
  44. GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission
  45. Konus-Wind detection of GRB 241105A (short with extended emission)
  46. Konus-Wind detection of GRB 241021A
  47. GRB 241105A: SVOM/VT optical afterglow observations
  48. GRB 241105A: Swift-XRT afterglow detection
  49. GRB 241105A: VLT/FORS2 spectroscopic redshift z = 2.681
  50. GRB 241104A: Swift-XRT observations
  51. GRB 240511A: LCO upper limits
  52. GRB 241104A: Fermi GBM Observation
  53. GRB 241104A: The SVOM/VT candidate in GCN circular 38086 is not an astrophysical source
  54. GRB 241105A: Swift ToO observations
  55. GRB 241105A: Swift/BAT-GUANO arcminute localization of a short burst
  56. GRB 241104A: Swift ToO observations
  57. GRB 241104A: NOT optical non-detection
  58. GRB 241105A: GOTO tentative optical counterpart candidate
  59. Fermi GRB 241105A: Global MASTER-Net observations report
  60. GRB 241104A: SVOM/VT optical candidate
  61. GRB 241105A: Fermi GBM Final Real-time Localization
  62. GRB 241104A/EP241104a: Optical upper limits with Kinder observations
  63. GRB 241104A: COLIBRÍ Upper Limits on the Optical Counterpart
  64. GRB 241104A: SVOM/GRM observation
  65. EP241104a: EP detection of GRB 241104A X-ray emission
  66. GRB 241010A: host galaxy redshift z = 0.977
  67. GRB 241104A : Detection and localization by SVOM/ECLAIRs
  68. GRB 240821A: further radio observations with the VLA
  69. Fermi GRB 241104A: Global MASTER-Net observations report
  70. GRB 241104A: Fermi GBM Final Real-time Localization
  71. GRB 241030A: GRBAlpha detection
  72. Fermi trigger No 752365806: Global MASTER-Net observations report
  73. GRB 241030A: Swift-UVOT observations of the optical prompt flare
  74. GRB 241030A: Rapid release of TESS data.
  75. GRB 241029A: GRBAlpha detection
  76. Kinder optical follow-up observations of EP241021a, EP241026b, and EP241030a/GRB241030A
  77. GRB241030A: OHP/T193 optical observations
  78. EP241030a: Futher EP-FXT observation of the X-ray Afterglow of GRB 241030A
  79. Swift GRB 241101A: Global MASTER-Net observations report
  80. GRB 241101A: FRAM-ORM optical limit
  81. GRB 241030A/EP241030a: TNOT observations of the optical counterpart
  82. EP241021a: Upper limit from Konus-Wind observations
  83. GRB 241101A: Swift-BAT refined analysis
  84. GRB 241030A: further SAO RAS optical observations
  85. GRB 241030A: Optical Observations via Virtual Telescope Project
  86. GRB 241030B: Swift-XRT refined Analysis
  87. GRB 241026A: SAO RAS optical observations
  88. GRB 241030A / EP241030a: GMG possible spectroscopic redshift at z ~ 1.4
  89. EP241030a: EP/FXT observation of GRB 241030A X-ray Afterglow
  90. GRB 241101A: Swift detection of a burst
  91. GRB 241030B: NUTTelA-TAO / BSTI Optical Limits (duplicate submission of 38023)
  92. GRB 241030B: NUTTelA-TAO / BSTI Optical Limits
  93. GRB 241030A: Palomar 1-m telescope COSMOS optical observations
  94. GRB 241030B: Montarrenti Observatory optical upper limit
  95. GRB 241030A / EP241030a: FTW Optical and NIR observations of the optical counterpart
  96. Fermi trigger No 752083996: Global MASTER-Net observations report
  97. GRB 241030A: SAO RAS optical observations
  98. GRB 241030A: Fermi GBM Observation
  99. GRB 241030B : GIT optical upper limits
  100. GRB 241030B: LCOGT Optical Upper Limits

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