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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').
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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"

28274 results found.

  1. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  2. GRB 241115A: Mephisto upper limits
  3. GRB 241113B: Mephisto upper limits
  4. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  5. GRB 241115D / EP 241115a: SVOM/GRM observation
  6. EP241113a: Swift XRT weak detection
  7. GRB 241115A: Fermi GBM Observation
  8. GRB 241115A: LCOGT Optical Upper Limits
  9. GRB 241115C: Swift/BAT-GUANO localization skymap of a burst
  10. LIGO/Virgo/KAGRA S241114bi: Updated Sky localization and EM Bright Classification
  11. LIGO/Virgo/KAGRA S241113p: Updated Sky localization
  12. EP241115a: EP detection of a fast X-ray transient
  13. Swift GRB 241115A: Global MASTER-Net observations report
  14. Fermi GRB 241115A: Global MASTER-Net observations report
  15. GRB 241115A: Swift detection of a burst
  16. EP 241113a: LBT possible optical counterpart
  17. LIGO/Virgo/KAGRA S241114bi: Upper limits from Fermi-GBM Observations
  18. LIGO/Virgo/KAGRA S241114bi: Coverage and upper limits from MAXI/GSC observations
  19. GRB 241113A: Swift-BAT refined analysis
  20. LIGO/Virgo/KAGRA S241114bi: Identification of a GW compact binary merger candidate
  21. GRB 241113A: PRIME near-infrared upper limits
  22. EP241113a: Global MASTER-Net observations report
  23. GRB 241113B: J-band upper limit from WINTER
  24. GRB 241113A: J-band observations with WINTER
  25. EP241113a : J-band observations with WINTER
  26. GRB 241030A: LCO optical observation
  27. GRB 241113B: Swift-XRT observations
  28. IceCube-241113A: Upper limits from a search for additional neutrino events in IceCube
  29. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  30. EP241113b/GRB 241113B: EP detection of GRB 241113B
  31. Fermi-LAT gamma-ray observations of IceCube-241113A
  32. LIGO/Virgo/KAGRA S241114y: Identification of a GW compact binary merger candidate
  33. GRB 241113A: Swift-XRT refined Analysis
  34. GRB 241113A: Swift/UVOT Detection
  35. GRB 241113A: REM detection of the optical/NIR afterglow
  36. LIGO/Virgo/KAGRA S241113p: Identification of a GW compact binary merger candidate
  37. GRB 241113A: LCO optical observations
  38. GRB 241112B: GMG Optical Upper Limit
  39. GRB 241113A: Enhanced Swift-XRT position
  40. GRB241113A: LCOGT (40-cm) optical counterpart detection
  41. GRB 241113A: Swift detection of a burst with an optical counterpart
  42. SVOM/GRM detection of a short burst from SGR 1E1841-045
  43. LIGO/Virgo/KAGRA S241111bn: Updated Sky localization
  44. GRB 241112B: AbAO optical upper limit
  45. GRB 241107A: GROWTH-India telescope optical upper limit
  46. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  47. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  48. GRB 241112B: Swift-XRT afterglow detection
  49. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  50. GRB 241112B: Mephisto optical upper limits
  51. GRB 241112B: GOTO optical upper limits
  52. GRB 241107A: INTEGRAL IBIS localization
  53. LIGO/Virgo/KAGRA S241110br: NED Galaxies in the Localization Volume
  54. LIGO/Virgo/KAGRA S241109bn: ATLAS observations and discovery of the potential counterpart AT2024aawt
  55. GRB 241105A: VLT/FORS2 refined spectroscopic redshift z = 2.681
  56. LIGO/Virgo/KAGRA S241111bn: Identification of a GW compact binary merger candidate
  57. IPN triangulation of GRB 241107A (short/hard)
  58. GRB 241025C: VZLUSAT-2 detection
  59. GRB 241025A: VZLUSAT-2 detection
  60. GRB 241018A: cubesat Avion detection
  61. GRB 241030B: TESS detection of optical counterpart
  62. LIGO/Virgo/KAGRA S241110br: Updated Sky localization
  63. LIGO/Virgo/KAGRA S241110bk: 1 counterpart neutrino candidate event from an IceCube neutrino search
  64. LIGO/Virgo/KAGRA S241110br: Identification of a GW compact binary merger candidate
  65. LIGO/Virgo/KAGRA S241109bn: Upper limits from EP-WXT observations
  66. Integral GRB241109.89: Global MASTER-Net observations report
  67. LIGO/Virgo/KAGRA S241109bn: Coverage and upper limits from MAXI/GSC observations
  68. LIGO/Virgo/KAGRA S241109bn: Updated Sky localization and EM Bright Classification
  69. EP241107a: AbAO optical upper limit
  70. LIGO/Virgo/KAGRA S241109bn: Upper limits from Fermi-GBM Observations
  71. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  72. LIGO/Virgo/KAGRA S241109p: Updated Sky localization and Source Classification
  73. LIGO/Virgo/KAGRA S241109bn: Identification of a GW compact binary merger candidate
  74. EP241109a: confirmation of a stellar flare by BOOTES-7
  75. GRB 241108A: Swift-XRT observations
  76. LIGO/Virgo/KAGRA S241109p: Identification of a GW compact binary merger candidate
  77. EP241107a: KAIT optical observations
  78. GRB 241030A: TESS observations
  79. GRB 241108A: COLIBRÍ Upper Limits on the Optical Counterpart
  80. EP241107a: Kinder optical follow-up observations
  81. GRB 241025A: radio detection with the VLA
  82. EP241107a: AKO Optical Afterglow Follow-Up Observations
  83. EP241107a: GSP detects optical counterpart
  84. GRB 241105A: SVOM/GRM observation
  85. EP241107a: OHP/T193 photometric and spectroscopic observations
  86. GRB 241105a: PRIME near-infrared upper limits
  87. GRB 241105A: ePESSTO+ NTT optical afterglow detection
  88. EP241107a: GIT optical observations
  89. EP241107a: SVOM/C-GFT optical observations
  90. EP241107a: AKO Optical Afterglow Detection
  91. GRB 241025A: LBT optical observations
  92. GRB 241105A: VLT/FORS2 optical afterglow rapid fading
  93. GRB 241105A: Swift/UVOT Detection
  94. GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission
  95. LIGO/Virgo/KAGRA S241106ba: 1 counterpart neutrino candidate event from an IceCube neutrino search
  96. LIGO/Virgo/KAGRA S241102o: 1 counterpart neutrino candidate event from an IceCube neutrino search
  97. GRB 241105A: Swift-XRT afterglow detection
  98. GRB 241105A: VLT/FORS2 spectroscopic redshift z = 2.681
  99. GRB 241104A: Swift-XRT observations
  100. GRB 240511A: LCO upper limits

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