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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"

19694 results found.

  1. GRB 241115A: LCOGT Optical Upper Limits
  2. GRB 241115C: Swift/BAT-GUANO localization skymap of a burst
  3. EP241115a: EP detection of a fast X-ray transient
  4. GRB 241115A: Swift detection of a burst
  5. EP 241113a: LBT possible optical counterpart
  6. GRB 241113A: PRIME near-infrared upper limits
  7. GRB 241113B: J-band upper limit from WINTER
  8. GRB 241113A: J-band observations with WINTER
  9. EP241113a : J-band observations with WINTER
  10. GRB 241030A: LCO optical observation
  11. GRB 241113B: Swift-XRT observations
  12. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  13. EP241113b/GRB 241113B: EP detection of GRB 241113B
  14. LIGO/Virgo/KAGRA S241114y: Identification of a GW compact binary merger candidate
  15. GRB 241113A: Swift/UVOT Detection
  16. GRB 241113A: REM detection of the optical/NIR afterglow
  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: Swift detection of a burst with an optical counterpart
  24. SVOM/GRM detection of a short burst from SGR 1E1841-045
  25. GRB 241112B: AbAO optical upper limit
  26. GRB 241107A: GROWTH-India telescope optical upper limit
  27. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  28. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  29. GRB 241112B: Mephisto optical upper limits
  30. GRB 241112B: GOTO optical upper limits
  31. GRB 241112B: Swift ToO observations
  32. GRB 241112B : detection of a long GRB by SVOM/ECLAIRs
  33. GRB 241107A: INTEGRAL IBIS localization
  34. LIGO/Virgo/KAGRA S241109bn: ATLAS observations and discovery of the potential counterpart AT2024aawt
  35. LIGO/Virgo/KAGRA S241111bn: Identification of a GW compact binary merger candidate
  36. IPN triangulation of GRB 241107A (short/hard)
  37. GRB 241107A: INTEGRAL/IBIS/PICsIT detection of a short burst
  38. GRB 241018A: cubesat Avion detection
  39. LIGO/Virgo/KAGRA S241109bn: Upper limits from EP-WXT observations
  40. LIGO/Virgo/KAGRA S241109bn: Coverage and upper limits from MAXI/GSC observations
  41. INTEGRAL detection of a burst from 1E 1841-045
  42. EP241107a: AbAO optical upper limit
  43. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  44. EP241107a: KAIT optical observations
  45. GRB 241108A: Swift ToO observations
  46. GRB 241108A: COLIBRÍ Upper Limits on the Optical Counterpart
  47. EP241107a: Kinder optical follow-up observations
  48. GRB 241025A: radio detection with the VLA
  49. EP241107a: AKO Optical Afterglow Follow-Up Observations
  50. GRB 241105A: SVOM/GRM observation
  51. EP241107a: OHP/T193 photometric and spectroscopic observations
  52. GRB 241105a: PRIME near-infrared upper limits
  53. GRB 241105A: ePESSTO+ NTT optical afterglow detection
  54. EP241107a: GIT optical observations
  55. EP241107a: SVOM/C-GFT optical observations
  56. EP241107a: AKO Optical Afterglow Detection
  57. GRB 241025A: LBT optical observations
  58. GRB 241105A: VLT/FORS2 optical afterglow rapid fading
  59. GRB 241105A: Swift/UVOT Detection
  60. GRB 241105A: Swift-XRT afterglow detection
  61. GRB 241104A: Swift-XRT observations
  62. GRB 240511A: LCO upper limits
  63. GRB 241105A: Swift ToO observations
  64. GRB 241104A: Swift ToO observations
  65. GRB 241104A: SVOM/VT optical candidate
  66. GRB 241104A/EP241104a: Optical upper limits with Kinder observations
  67. GRB 241104A: COLIBRÍ Upper Limits on the Optical Counterpart
  68. EP241104a: EP detection of GRB 241104A X-ray emission
  69. GRB 241010A: host galaxy redshift z = 0.977
  70. EP241101a NUTTelA-TAO / BSTI Measurements 2024-11-02
  71. GRB 241104A : Detection and localization by SVOM/ECLAIRs
  72. GRB 240821A: further radio observations with the VLA
  73. EP241103a: GIT optical upper limit
  74. EP241021a: OHP/T193 further optical observations
  75. LIGO/Virgo/KAGRA S241102br: OHP/T193 optical observations
  76. EP241103a: Swift XRT detection and improved X-ray position
  77. EP241021a: continued SOAR observations
  78. EP241101a: Optical upper limits with Kinder observations
  79. EP241101a: OHP/T193 optical observations
  80. EP241103a: EP observation update
  81. LIGO/Virgo/KAGRA S241102br: EP-WXT X-ray follow-up and flux limits
  82. GRB 241030A: Swift-UVOT observations of the optical prompt flare
  83. EP241103A: LCO optical observations
  84. EP241103a: an X-ray transient detected by Einstein Probe
  85. S241102cy: Identification of a GW compact binary merger candidate
  86. LIGO/Virgo/KAGRA S241102br: Identification of a GW compact binary merger candidate
  87. Kinder optical follow-up observations of EP241021a, EP241026b, and EP241030a/GRB241030A
  88. GRB241030A: OHP/T193 optical observations
  89. GRB 241101A: FRAM-ORM optical limit
  90. GRB 241030A/EP241030a: TNOT observations of the optical counterpart
  91. GRB 241030A: further SAO RAS optical observations
  92. GRB 241030A: Optical Observations via Virtual Telescope Project
  93. EP241021a: Liverpool Telescope optical follow-up observations
  94. GRB 241026A: SAO RAS optical observations
  95. GRB 241030B: NUTTelA-TAO / BSTI Optical Limits
  96. EP241021a: OHP/T193 optical observations
  97. GRB 241030A: Palomar 1-m telescope COSMOS optical observations
  98. GRB 241030B: Montarrenti Observatory optical upper limit
  99. EP241026b: Liverpool Telescope optical follow-up
  100. GRB 241030A: SAO RAS optical observations

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