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This trigger is identified with the interesting source Ser_X-1,
which is entry no. 15304 in the on-board catalog.
It is a source type 16 in the catalog.
The (RA,Dec) of Ser_X-1 is (279.98983,5.03600).
The distance from the source if 5.350 deg.
The trigger appears to be affected by BAT 7-min race error.

GRB position information:
GRB_RA: 275.075d {+18h 20m 18s} (J2000),
GRB_DEC: +7.193d {+07d 11' 36"} (J2000),
GAL_COORDS: 35.85, 10.18 [deg] galactic lon,lat of the burst (or transient)
Sun angle: 112.83
Moon angle: 139.39

MET of BAT trigger is 546139848.00 using SOD of 5427.17

E(B-V) report for trigger 827924 using BAT GRB Position of (275.075,+7.193)
Reference is GCN_Notice_Mon_23_Apr_18_01:44:00_UT
E(B-V) = 0.23

Bandpass A_lambda
(microns) (mag)
U (0.34) 1.250
B (0.44) 0.993
V (0.54) 0.763
R (0.65) 0.615
I (0.81) 0.446

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