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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

36209 results found.

  1. Fermi GRB 241114A: Global MASTER-Net observations report
  2. GRB 241114A: Fermi GBM Final Real-time Localization
  3. GRB 241113B: J-band upper limit from WINTER
  4. GRB 241113A: J-band observations with WINTER
  5. GRB 241030A: LCO optical observation
  6. GRB 241113B: Swift-XRT observations
  7. IceCube-241113A: Upper limits from a search for additional neutrino events in IceCube
  8. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  9. GRB 241113A: KAIT optical observations
  10. EP241113b/GRB 241113B: EP detection of GRB 241113B
  11. GRB 241113B: SVOM/GRM observation
  12. GRB 241113A: Swift-XRT refined Analysis
  13. GRB 241113A: Swift/UVOT Detection
  14. GRB 241113A: REM detection of the optical/NIR afterglow
  15. Konus-Wind detection of GRB 241107A (short/hard)
  16. Fermi Gamma-ray Burst Monitor trigger 753166198/241113201 is not a GRB
  17. GRB 241113B: Swift ToO observations
  18. GRB 241113A: LCO optical observations
  19. GRB 241112B: GMG Optical Upper Limit
  20. GRB 241113A: Enhanced Swift-XRT position
  21. GRB241113A: LCOGT (40-cm) optical counterpart detection
  22. GRB 241113B : detection of a long GRB by SVOM/ECLAIRs
  23. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  24. GRB 241113A: Swift detection of a burst with an optical counterpart
  25. GRB 241105A: ATCA Radio Upper Limits
  26. GRB 241112B: AbAO optical upper limit
  27. GRB 241107A: GROWTH-India telescope optical upper limit
  28. Fermi GRB 241112A: Global MASTER-Net observations report
  29. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  30. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  31. GRB 241112B: Swift-XRT afterglow detection
  32. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  33. GRB 241112B: SVOM/GRM observation
  34. GRB 241112B: SVOM/VT afterglow detection
  35. Fermi Gamma-ray Burst Monitor trigger 752995908/241111230 (GRB 241111A) is not a GRB
  36. GRB 241107A: Swift/BAT candidate arcminute localization of a short burst
  37. GRB 241112B: Mephisto optical upper limits
  38. GRB 241112B: GOTO optical upper limits
  39. GRB 241112B: Swift ToO observations
  40. GRB 241112B : detection of a long GRB by SVOM/ECLAIRs
  41. GRB 241107A: INTEGRAL IBIS localization
  42. GRB 241112A: Fermi GBM Final Real-time Localization
  43. GRB 241105A: VLT/FORS2 refined spectroscopic redshift z = 2.681
  44. IPN triangulation of GRB 241107A (short/hard)
  45. GRB 241107A: INTEGRAL/IBIS/PICsIT detection of a short burst
  46. GRB 241025C: VZLUSAT-2 detection
  47. GRB 241025A: VZLUSAT-2 detection
  48. GRB 241018A: cubesat Avion detection
  49. GRB 241111A: Fermi GBM Final Real-time Localization
  50. GRB 241030B: TESS detection of optical counterpart
  51. EP241109a: KAIT photometry and 3 m Shane spectroscopy from Lick observatory
  52. EP241107a: AbAO optical upper limit
  53. LIGO/Virgo/KAGRA S241109bn: Upper limits from Fermi-GBM Observations
  54. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  55. EP241109a: confirmation of a stellar flare by BOOTES-7
  56. GRB 241108A: Swift-XRT observations
  57. EP241107A: MASTER optical observations of xray transient
  58. EP241107a: KAIT optical observations
  59. GRB 241108A: Swift ToO observations
  60. GRB 241030A: TESS observations
  61. GRB 241108A: COLIBRÍ Upper Limits on the Optical Counterpart
  62. GRB 241108A : a likely weak long GRB detected by SVOM/ECLAIRs
  63. GRB 241025A: radio detection with the VLA
  64. GRB 241104A: CALET Gamma-Ray Burst Monitor detection
  65. GRB 241107A: SVOM/GRM detection of a short burst
  66. GRB 241105A: EP-FXT follow-up observations
  67. GRB 241105A: SVOM/GRM observation
  68. GRB 241105a: PRIME near-infrared upper limits
  69. GRB 241105A: ePESSTO+ NTT optical afterglow detection
  70. GRB 241025A: LBT optical observations
  71. GRB241105A: Gemini-South Optical Afterglow Detection
  72. GRB 241105A: VLT/FORS2 optical afterglow rapid fading
  73. GRB 241105A: Swift/UVOT Detection
  74. EP241101a: CrAO ZTSH optical observations
  75. GRB 241105A: Swift/BAT-GUANO refined analysis of short burst with extended emission
  76. GRB 241030A: optical afterglow detection from the INAF Asiago Observatory
  77. GRB 241105A: BOOTES-7 optical detection
  78. GRB 241030A: Mondy optical observations
  79. GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission
  80. Konus-Wind detection of GRB 241105A (short with extended emission)
  81. Konus-Wind detection of GRB 241021A
  82. GRB 241105A: SVOM/VT optical afterglow observations
  83. GRB 241105A: Swift-XRT afterglow detection
  84. GRB 241105A: VLT/FORS2 spectroscopic redshift z = 2.681
  85. GRB 241104A: Swift-XRT observations
  86. GRB 240511A: LCO upper limits
  87. GRB 241104A: Fermi GBM Observation
  88. GRB 241104A: The SVOM/VT candidate in GCN circular 38086 is not an astrophysical source
  89. GRB 241105A: Swift ToO observations
  90. GRB 241105A: Swift/BAT-GUANO arcminute localization of a short burst
  91. GRB 241104A: Swift ToO observations
  92. GRB 241104A: NOT optical non-detection
  93. GRB 241105A: GOTO tentative optical counterpart candidate
  94. Fermi GRB 241105A: Global MASTER-Net observations report
  95. GRB 241104A: SVOM/VT optical candidate
  96. GRB 241105A: Fermi GBM Final Real-time Localization
  97. GRB 241104A/EP241104a: Optical upper limits with Kinder observations
  98. GRB 241104A: COLIBRÍ Upper Limits on the Optical Counterpart
  99. GRB 241104A: SVOM/GRM observation
  100. EP241104a: EP detection of GRB 241104A X-ray emission

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