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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

83 results found.

  1. GRB 260120A: AstroSat CZTI detection
  2. GRB 251102A: AstroSat CZTI detection
  3. GRB 250430A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  4. IceCube Alert 250406.95: Global MASTER-Net observations report
  5. GRB 250204B: AstroSat CZTI detection of a short burst
  6. LIGO/Virgo S250119cv: Swift XRT observations, 5 X-ray sources
  7. LIGO/Virgo/KAGRA S240920dw: Identification of a GW compact binary merger candidate
  8. Fermi GRB 240814C: Global MASTER-Net observations report
  9. Fermi trigger No 737218721: Global MASTER-Net observations report
  10. GRB 240101B: Swift-XRT refined Analysis
  11. GRB 231111A: Leavitt Observatory optical observations
  12. Glowbug gamma-ray detection GRB 230905B
  13. Fermi GRB 230818A: Global MASTER-Net observations report
  14. GRB 230405B: AstroSat CZTI detection
  15. GRB 230116D: Nanshan/NEXT optical afterglow detection
  16. Fermi trigger No 651110719: Global MASTER-Net observations report
  17. Fermi trigger No 649072251: Global MASTER-Net observations report
  18. IceCube-210516A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  19. Integral GRB210227.19: Global MASTER-Net observations report
  20. NuEm-210111A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  21. Fermi trigger No 627438255: Global MASTER-Net observations report
  22. INTEGRAL Weak#8811: AROMA-N Optical Observation
  23. GRB 200714E: Fermi GBM observation
  24. GRB 190605A: AstroSat CZTI detection
  25. CORRECTED TARGET NAME: GRB 190408A: MAXI/GSC detection
  26. GRB 140408A: MAXI/GSC detection
  27. Konus-Wind observation of GRB 190106A
  28. Trigger 813449: Swift detection of large burst from XTE J1701-407
  29. GRB 160804A: 15 GHz detections and upper limit from AMI
  30. GRB 160321A: 15 GHz upper limits from AMI
  31. Swift-BAT trigger 686845 was due to noise near a known source
  32. Konus-Wind observation of GRB 160119A
  33. Swift trigger 637807 is probably not an astrophysical source
  34. GRB 140419A: KAIT Refined Analysis
  35. GRB 140129B: MASTER OT early light curve
  36. GRB 140108A: Swift/UVOT Detection
  37. Trigger 538084: Swift detection of XTE J1739-302
  38. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  39. IBAS Alert n. 6057 is not due to a GRB
  40. GRB 100728A: Swift-XRT refined analysis
  41. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  42. IBAS Alert 5992 is not a GRB, but XTE J1855-026
  43. Swift/BAT Detects an Outburst from XTE J1901+014
  44. Swift Trigger #382159 is due to XTE J1752-223
  45. Swift-BAT trigger 373691 is a galactic bulge transient
  46. GRB 091010: RXTE detection
  47. GRB 090411B: Fermi GBM detection
  48. GRB 080916C: Swift/XRT detection of possible afterglow
  49. Swift detection of XTE J1701-407
  50. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  51. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  52. GRB 080520: VLT host detection
  53. GRB 080330 Swift-UVOT refined analysis
  54. Radio Detection of GRB 080319B
  55. GRB 071112C: emission lines and refined VLT redshift
  56. GRB 060602A: host redshift
  57. GRB071003: Faulkes Telescope North observations
  58. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  59. VLA detection of GRB 070612A in C Band
  60. GRB070223: Swift/UVOT refined analysis
  61. GRB 061021: Swift-XRT refined analysis
  62. GCN 060708: Swift-UVOT Observations
  63. GRB 060614: Swift/UVOT Observations
  64. GRB 051022: XRT Refined Spectral and Temporal Analysis
  65. GRB051001: Swift UVOT Upper Limits
  66. GRB 051001: Swift Detection of a Burst
  67. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  68. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  69. IPN detection of continued activity from SGR1806-20
  70. GRB030329: HET spectroscopic monitoring
  71. GRB 030329, optical spectroscopy
  72. Detection of activity from SGR 1900+14 with the RXTE/PCA
  73. RXTE Observations of SGR 1900+14
  74. The X-ray Flash 011030 ('GRB 011030')
  75. SGR 1900+14 : RXTE observations
  76. Further Optical Observations of GRB 010324
  77. Optical Observations of GRB 010324
  78. GCN resumes full operations
  79. Chandra observation of the X-ray afterglow of GRB991216
  80. GRB 990506: Limits on the possible optical transient
  81. GRB990308 (Trig. 7457), optical observations
  82. GRB980703 - BeppoSAX/GRBM detection
  83. GRB 980703: BATSE Observations

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