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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.

"N/A_MC170405_R1" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

10959 results found.

  1. EP260119a: SVOM/VT optical observation
  2. GRB 260117A: ZTSh optical upper limit
  3. GRB 260110A: SVOM detection of a burst through offline search
  4. Swift trigger on the HMXB 1A 1118-61
  5. GRB 260117A: SVOM/VT optical candidate
  6. GRB 260114A: VLT/MUSE spectroscopic observations
  7. EP260116a: Xinglong optical upper limit
  8. GRB 260114A: VLT/HAWK-I further near-infrared upper limits
  9. GRB 251222A: radio detection with the VLA
  10. GRB 260114A : MITSuME Akeno optical upper limits
  11. GRB 260114A: Mondy optical observations
  12. GRB 260114A: Swift detection of a short burst
  13. EP260110a: NOT and GTC Optical and Near-Infrared Observations
  14. GRB 251230A: Mondy Optical Observations
  15. EP260110a: SVOM/VT optical upper limits
  16. Swift Trigger 1434591: possible GRB 260109C
  17. GRB 260102A: AbAO optical observations
  18. EP260105a: SVOM/VT optical upperlimit
  19. FRB 20251229A: A potentially hyperactive repeating fast radio burst source
  20. GRB 260101A: Swift/UVOT Detection
  21. GRB 260102A: SVOM/VT optical counterpart
  22. GRB 260101A: NOT spectroscopic observations
  23. GRB 260101A: OSIRIS+ redshift z = 2.623 for the new year burst
  24. GRB 260101A: Swift detection of a burst with an optical counterpart
  25. GRB 251230A / EP251230a: SVOM/VT optical continued observations and upper limit
  26. GRB 251230A: GRANDMA/TAROT Early Detection
  27. GRB 251230A/EP251230a: Optical upper limit with Kinder observations
  28. EP251229a: Optical upper limit with Kinder observations
  29. GRB 251222A: Mondy Optical Observations
  30. GRB251230A: 7DT optical upper limits
  31. GRB 251230A / EP251230a: SVOM/VT optical observation
  32. GRB 251129A: redshift correction and SN detection at z = 0.505 with GTC
  33. GRB 251222A/EP251222b: Optical detection with Kinder observations
  34. EP251222a: Optical upper limit with Kinder observations
  35. GRB 251222A: AbAO optical observations
  36. GRB 251222A: ZTSH BVRI optical observations
  37. EP251220a: CrAO ZTSh optical observations
  38. EP251221a: PRIME upper limit
  39. GRB251221A: 7DT optical upper limits
  40. GRB 251222A / EP251222b: SVOM/VT optical rebrightening
  41. GRB 251222A: PRIME near-infrared detection
  42. EP251220a: PRIME upper limit
  43. GRB 251221A: PRIME near-infrared observation
  44. GRB 251221A: UAFO and Mondy optical upper limit
  45. GRB 251220A: MAXI/GSC detection
  46. IceCube-251218A: COLIBRÍ optical upper limits
  47. GRB 251214B: VIRT Optical Upper Limit
  48. GRB 251202A/EP251202a: Koshka optical upper limit
  49. GRB 251214B: Mondy optical upper limit
  50. EP251214a: Optical upper limit with Kinder observations
  51. GRB 251214B: UAFO optical upper limit
  52. GRB 251202A: radio detection with the VLA
  53. GRB 251214B: AbAO optical observations
  54. GRB 251203B: AbAO optical observations
  55. GRB 251214B : MASTER optical afterglow detection
  56. GRB 251214B: Swift detection of a burst with an optical counterpart
  57. EP251124a: Mondy optical upper limit
  58. GRB 251129A/EP251129a: AbAO and Mondy optical observations
  59. EP251130a: Mondy and AbAO optical observations
  60. GRB 251208B: Fermi-LAT detection
  61. GRB 251206A: SVOM detection of a burst through offline search
  62. GRB 251205A : MITSuME Akeno optical afterglow candidate detection
  63. GRB 251205A: Swift/UVOT Detection
  64. GRB 251203C: Swift/UVOT Upper Limit
  65. GRB 251205A: Zeiss-1000 Koshka observatory optical observations
  66. GRB 251205A: NOT optical observations
  67. GRB 251205A: GTC/OSIRIS+ redshift z = 1.100
  68. Swift GRB 251205A : MASTER OT detection with host galaxy
  69. GRB 251205A: Swift detection of a burst with an optical afterglow
  70. GRB 251203C: SVOM/ECLAIRs refined analysis
  71. GRB 251203C: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  72. GRB 251203C: LCO optical afterglow confirmation
  73. GRB 251203C: SVOM/VT optical counterpart
  74. GRB 251203B : SVOM trigger sb25120304 is not a GRB
  75. GRB 251203C: LCO optical upper limits
  76. GRB 251203B: LCO optical upper limits
  77. GRB 251203C: SVOM detection of a burst
  78. GRB 251203B: SVOM detection of a burst
  79. GRB 251129A / EP251129a: SVOM/VT optical color bluer
  80. GRB 251202A / EP251202a: SVOM/VT optical observation
  81. GRB 251122A/EP251122a: CrAO ZTSh optical observations
  82. EP251202a / GRB 251202A: LCO r- and i-band optical detection
  83. EP251202a/GRB 251202A: refined analysis of the EP-WXT observations
  84. GRB 251126A: SAO RAS optical marginal detection
  85. GRB 251126A: SVOM/VT optical observation
  86. EP251130a: SVOM/VT optical observation
  87. EP251202a/GRB 251202A: Einstein Probe detection of an X-ray transient
  88. GRB 251201B: SVOM/VT optical fading
  89. Swift GRB 251201B : MASTER optical counterpart detection
  90. EP251118a: Mondy, CrAO, Assy and SAO RAS/Zeiss-1000 optical observations
  91. EP251130a: Mondy optical observations
  92. EP251130a: Optical detections with Kinder observations
  93. EP251130a: GTC OSIRIS+ redshift z = 4.035 and rebrightening
  94. GRB 251201A: MAXI/GSC detection
  95. GRB 251129A / EP251129a: OSN and CAHA optical follow-up
  96. GRB 251129A / EP251129a: SAO RAS optical observations
  97. GRB 251126A: SAO RAS optical observations
  98. SVOM GRB 251129A : MASTER optical counterpart detection
  99. Swift trigger 1418333 is not an astrophysical source
  100. GRB 251129A / EP251129a: SVOM/VT optical fading

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